Something new under the Sun: A magnetically driven CH/CN anti-correlation

F. Almeida-Fernandes; F. R. Herpich; G. Costa; G. Volpato; I. Saviane; I. Yegorova; L. Girardi; L. Monaco; M. Dima; M. Montalto

REVIEW 4 major objections 4 minor 298 references

Something new under the Sun: A magnetically driven CH/CN anti-correlation

T0 review · 4 major / 4 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read The Sun's magnetic cycle produces a CH/CN anti-correlation that can mimic the chemical split seen in globular cluster stars.

desk verdict The solar CH/CN anti-correlation is a genuine new result worth following up; the bridge to globular cluster multiple populations is an unvalidated linear extrapolation and should be treated as a hypothesis, not a claim. read the letter →

arxiv 2608.02721 v1 pith:UUKYODRR submitted 2026-08-03 astro-ph.SR

Y. Momany , L. Monaco , S. Villanova , S. Zaggia , I. Saviane , L. Girardi , G. Volpato , G. Costa

show 6 more authors

N.R. Landin I. Yegorova M. Montalto M. Dima F. R. Herpich F. Almeida-Fernandes

This is my paper

classification astro-ph.SR

keywords CH/CNanti-correlationsolarmagneticcycleglobularclustermultiplepopulationsmolecularbandsfaculaesurfacemagnetismNGC104Sun-as-a-star

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper's central claim is that the CH/CN anti-correlation used to separate first- and second-population stars in globular clusters can be produced by a single star's magnetic cycle, with no change in true carbon or nitrogen abundances. It shows that the disc-integrated solar spectrum across the 23rd magnetic cycle behaves exactly this way—CH-poor and CN-rich at maximum activity, CH-rich and CN-poor at minimum—and corroborates the trend with ground-based spectra from the following cycle. First-order magnetohydrodynamic simulations of a magnetically enhanced solar analogue then expand the anti-correlation with increasing surface magnetic coverage, reaching an amplitude broadly consistent with the measured CH/CN spread of dwarf stars in the globular cluster NGC104. A sympathetic reader would take this as evidence that surface magnetism deserves a place among candidate explanations for the globular-cluster multiple-population phenomenon.

What carries the argument

The load-bearing object is a pair of narrow-band molecular indices—CH in the G band at 4300–4315 Å and CN at 4126–4214 Å—used as proxies for carbon and nitrogen. The paper applies these standard globular-cluster diagnostics to decade-long disc-integrated solar spectra and then extrapolates the observed magnetic imprint using first-order MHD simulations: index variations from a 200 G magnetic seed are scaled by $B/200$ to fields up to 3000 G, with spot coverage increasing linearly to 50% at the top end. The resulting differential indices δCH and δCN, referenced to each dataset's centroid, translate the solar cycle's molecular variations into the language used for cluster populations.

What would settle it

A direct test would be to compute CH/CN indices from 3D magnetohydrodynamic models of solar-type atmospheres at 1000 G and 3000 G without the linear scaling assumption and compare the resulting spread to the observed dwarf-star CH/CN spread in NGC104; if the model spread stops growing or changes direction, the mechanism fails.

Watch

Extended reading notes

Core claim

The paper reports that the disc-integrated solar spectrum, measured continuously across solar cycle 23 and validated in cycle 24, shows a genuine CH/CN anti-correlation: when magnetic activity is high the integrated spectrum is CH-poor and CN-rich; when activity is low it is CH-rich and CN-poor. The same molecular indices that distinguish first- and second-population stars in globular clusters therefore vary in a single ordinary star with no change in the underlying carbon or nitrogen abundances. Extending this with 3D radiative magnetohydrodynamic simulations of a solar analogue, the paper argues that raising the mean surface magnetic field and the fractional coverage of faculae and spots expands the anti-correlation, and that a combined faculae-plus-spot model reproduces the amplitude and slope of the CH/CN spread observed among dwarf stars in NGC104. The paper proposes surface magnetism as a physical framework for the multiple-population phenomenon, while noting that it does not yet account for the full range of observed abundance anti-correlations.

Load-bearing premise

The entire bridge to globular clusters rests on the premise that CH and CN index changes scale linearly with mean surface magnetic field from the Sun's 200 G seed up to 3000 G, with spot coverage forced to 50% at the top end; molecular band formation is nonlinear in temperature and filling factor, so if that scaling saturates or bends the claimed match to cluster data collapses.

Editorial extensions

If this is right

The Sun alone, with fixed carbon and nitrogen abundances, reproduces the sign and shape of the CH/CN anti-correlation used to separate first- and second-population stars in globular clusters.
Higher surface magnetic coverage—faculae and spots together—expands the CH/CN spread, so moderately active solar-type stars should look progressively more second-population-like in these indices.
The photometric G-band brightening of second-population stars becomes a natural consequence of facular continuum enhancement, not necessarily a signature of higher nitrogen abundance.
The framework predicts that the multiple-population phenomenon should disappear for stars without convective envelopes, matching the empirical ~2 Gyr age threshold and the Kraft break.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

If the magnetic interpretation is right, published carbon and nitrogen abundance ratios for second-population stars could be systematically biased by unmodeled surface magnetic filling factors, and future abundance analyses will need to include a magnetic term.
The same mechanism implies that long-baseline monitoring of solar twins should show cycle-phase-dependent CH/CN variations that mimic cluster-population movement, a prediction that could be tested with existing decade-long archives of solar-type spectra.
The predicted facular bright-to-dark inversion in M dwarfs provides a clean, independently testable consequence: magnetically active M dwarfs should show a colour switch opposite to that of G/K dwarfs, which can be checked with current stellar activity surveys.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

Short version: the solar result is real and worth knowing; the globular cluster bridge is a suggestive extrapolation, not yet a measurement. The authors apply standard cluster CH/CN indices to a decade of disc-integrated solar data and find a cycle-driven anti-correlation, with two-epoch HARPS-N confirmation. That is new, and the underlying physics—hot-wall facular dissociation of CH—is on solid ground. Credit where due: they use the same bandpass definitions as cluster work, provide a SATIRE-S series over a full cycle, show mirrored CH/CN behavior, and are candid that the GC link is a proof-of-concept. The MAGISTER FAS acronym is explicitly offered as a framework, not a conclusion.

Soft spots, in proportion: the continuous anti-correlation comes from SATIRE-S, a model whose facular spectra already encode the molecular response, so it is not independent confirmation. The HARPS-N data are two one-month windows, no error bars, no significance tests. The bridge to NGC104 is the load-bearing weak point. Appendix B scales a single 200 G MURaM seed linearly in B up to 3000 G and forces spot coverage to 50%. Molecular line formation is nonlinear in temperature and filling factor, and one seed field strength does not constrain the response at 500, 1000, or 3000 G. The stress-test note is right: if the true scaling saturates or changes slope, the claimed match to the FORS2 dwarf data collapses. The authors acknowledge the first-order nature, but “broadly consistent” in Section 4.2 overstates what a linear extrapolation demonstrates. Appendices C–H are mostly qualitative speculation; they are clearly labeled as such and do not contaminate the central solar result, but they make the paper longer than its evidence.

Bottom line: treat this as hypothesis-generating. The solar empirical result deserves follow-up with a real time series—full-cycle HARPS-N with error bars, or SATIRE-S validated against atomic lines. The GC claim needs non-linear scaling tests and direct activity-versus-abundance comparisons before it can carry weight. I would send this to a serious referee: the solar part is solid enough, and the GC suggestion will provoke useful scrutiny. I expect the referee to push hard on the error analysis and the scaling. I would cite it for the solar CH/CN cycle behavior; the GC framework I would cite only as a speculative alternative, if at all.

Referee Report

4 major / 4 minor

Summary. The paper applies the CH and CN molecular-band indices used in globular-cluster multiple-population studies to disc-integrated solar spectra, reporting that the Sun exhibits a CH/CN anti-correlation that varies with the magnetic cycle. The continuous cycle behaviour is derived from SATIRE-S reconstructions, while ground-based HARPS-N spectra provide a two-epoch confirmation. The authors then use MURaM simulations of a G2 dwarf with [M/H]=-1 to argue that increasing magnetic activity, through enhanced facular and spot coverage, can amplify this anti-correlation to a level comparable to the CH/CN spread seen between first- and second-population dwarf stars in NGC104. On this basis they propose the MAGISTER FAS framework, in which surface magnetism rather than true C/N abundance variations could produce the spectroscopic signatures of multiple populations.

Significance. If the solar-cycle CH/CN anti-correlation is confirmed by direct observations and the simulated scaling to higher magnetic activity is validated, the paper would open a genuinely new avenue for the globular-cluster multiple-population problem, connecting it to stellar surface magnetism. The authors also deserve credit for using the same index definitions across solar, ground-based, and cluster datasets, and for clearly exposing most of their assumptions in appendices. However, the quantitative link to NGC104 is currently supported only by a linear extrapolation from a single 200 G simulation, and the continuous solar result is a model output rather than a direct measurement. These issues make the central astrophysical bridge interesting but not yet established.

major comments (4)

[Appendix B / Section 4.2] The quantitative bridge to NGC104 rests on an unvalidated linear scaling. The MURaM simulation is run with a single 200 G seed, and the CH/CN index variations are then multiplied by B/200 up to 3000 G, while spot coverage is forced linearly from 0% at 0 G to 50% at 3000 G. Molecular band formation is nonlinear in temperature, pressure, and magnetic filling factor, and a single one-point simulation does not constrain the response at 500, 1000, or 3000 G. The statement in Section 4.2 that the combined model yields a spread 'broadly consistent' with FORS2 observations of NGC104 is therefore not yet supported by a physical scaling law. I request direct MURaM runs at intermediate field strengths and filling factors, or at least a documented nonlinear response test, before the amplitude comparison in Fig. 3 can be considered quantitative.
[Section 3 / Fig. 1] The discovery claim must distinguish model output from direct observation. Panels b-d of Fig. 1 are derived from SATIRE-S reconstructions, not from observed solar spectra, and the SATIRE-S facular spectra already encode the molecular dissociation behaviour described in Appendix A.1. The HARPS-N data are the only direct spectroscopic evidence, and they consist of two one-month windows. I ask the authors to state explicitly which parts of the anti-correlation are model-generated, to validate the SATIRE-S index time series against observed solar spectra over overlapping epochs, and to provide error bars and a correlation coefficient for the claimed anti-correlation in panels d and e.
[Section 4.2 / Fig. 3] The comparison between the simulated green distribution and the FORS2 NGC104 data is qualitative. After centroid subtraction, the slope and scale of the distributions are compared by eye, and the green distribution is defined by two arbitrary endpoints (B=0 and B=3000 G with 50% spot and 50% facular coverage). No uncertainties are propagated from the choice of the MURaM seed, the spot-contrast model, or the linear scaling. I ask for a quantitative assessment of the match, such as a covariance-weighted fit to the two distributions, together with an explicit statement of how the endpoint choices affect the resulting spread.
[Appendix H / Section 5] The claim that dense cluster cores sustain rapid rotation and enhanced magnetic activity over cosmological timescales is not quantified. The BY Dra sample in NGC104 provides 24 stars with a mean period of about 4.6 days, but no encounter-rate calculation or angular-momentum budget is presented to show that repeated dynamical encounters can overcome gyrochronological spin-down for gigayear timescales. As written, this is an unsupported extrapolation that is nevertheless needed for the MAGISTER FAS framework to explain the persistence of 2P-like signatures in old clusters.

minor comments (4)

[Section 2.2] The two HARPS-N epochs are described as maximum and minimum activity, but no quantitative activity indicator (e.g., S-index or Ca II K flux) is provided for July 2015 and June 2018. Please include the actual activity levels used to define the epochs.
[Fig. 3 caption] The black and green simulation points are not individually labelled with their magnetic field strengths; add a colour bar or label representative B values so that the reader can see the spacing of the assumed linear grid.
[Appendix G] The OH312 and OH316 indices are mentioned in the text but their wavelength windows are never defined. Please give the bandpass limits for all seven molecular indices used in Fig. G.1.
[Section 2.4 / Fig. 2] The FLAMES red-HB sample is stated to come from Villanova et al. (2025), but the number of stars, the index definitions, and the uncertainties on the plotted C and N abundances are not given here. Please provide at least the sample size and typical errors in the figure or a table.

Circularity Check

1 steps flagged · score 6.0 of 10

The solar CH/CN anti-correlation is independently anchored by HARPS-N, but the quantitative bridge to NGC104 is constructed by the linear B/200 scaling and the chosen 3000 G / 50% spot-coverage endpoint.

fitted input called prediction [Appendix B and Section 4.2, Fig. 3]
"we scale the estimated CH and CN index variations by a factor of B/200, where B denotes the mean unsigned surface magnetic field. Field strengths are allowed to reach up to 3000 G–an extreme case in which the stellar surface is fully covered by flux tubes... This scenario models a linear increase in surface spot coverage with increasing input magnetic field strength B. Specifically, surface coverage ranges from 0% at B=0 G to 50% at B=3000 G."

The amplitude of the simulated green distribution in Fig. 3 is not derived from the MHD calculation alone; it is produced by linearly multiplying the index shifts of a single 200 G MURaM seed by B/200 up to 3000 G, and by imposing a spot filling factor that grows linearly to 50% at that endpoint. The MURaM run samples only one field strength and does not constrain the response at 500, 1000, or 3000 G, while CH/CN band formation is nonlinear in temperature and filling factor. Therefore the statement that the combined model 'yields a spectroscopic spread that is broadly consistent with the empirical FORS2 observations' is an arithmetic consequence of the chosen scaling and endpoint, not an independently predicted amplitude.

full rationale

The central empirical finding, the cycle-driven solar CH/CN anti-correlation, is not circular: the continuous SATIRE-S curve is a model reconstruction rather than a direct measurement, but the HARPS-N ground-based epochs independently reproduce the same CH-poor/CN-rich versus CH-rich/CN-poor trend across activity epochs, and the same index definitions are applied to both datasets. The self-citations (Momany et al. 2020; Villanova et al. 2025) provide independent observational data and do not carry the derivation by themselves. The main circularity-like step is in Appendix B: the simulation's amplitude growth is imposed through the linear B/200 scaling and the 3000 G with 50% spot-coverage endpoint, so the later claim of quantitative consistency with the NGC104 spread is partly constructed from those choices. The paper does explicitly label the simulations as first-order and not high-fidelity, which mitigates the severity, but the quantitative bridge to the globular-cluster spread still reduces to the assumed scaling rather than to a physically derived prediction. Thus the score is 6 rather than higher: the solar discovery and the cluster data remain independent, while the key quantitative match is partially by construction.

Assumptions & free parameters 3 free parameters · 6 assumptions · 1 invented entities

No new physical particles or forces are postulated; the central quantitative bridge is the linear B/200 scaling and the 50% spot coverage endpoint, both chosen by hand. The framework rests on domain assumptions about SATIRE-S, MURaM/MPS-ATLAS fidelity, solar-like dynamos in all low-mass cluster stars, and encounter-driven spin-up in dense cores.

free parameters (3)

magnetic field scaling factor B = 0 to 3000 G
Appendix B scales the simulated CH/CN index change by B/200 from a 200 G seed; the 3000 G endpoint sets the maximum amplitude used to compare with NGC104 spreads.
spot coverage fraction = 0% at 0 G, 50% at 3000 G
Appendix B imposes a linear increase in spot coverage with B; this choice directly sets the extent of the combined simulation distribution in Fig. 3.
initial magnetic seed = 200 G
Appendix B acknowledges the seed strength is arbitrary and that varying it changes flux tube coverage and thus the index variations.

assumptions (6)

domain assumption SATIRE-S reconstructions faithfully represent the cycle variability of solar CH and CN indices.
Sections 2.1 and 3 use SATIRE-S output as the continuous space-based dataset; the model's facular and spot spectra encode the molecular behavior being reported.
domain assumption MURaM and MPS-ATLAS simulations of a metal-poor G2 dwarf correctly predict CH and CN line formation.
Appendix B uses a 200 G small-scale dynamo seed at [M/H]=-1 and ray-by-ray spectral synthesis, without validation against observed active dwarf spectra.
ad hoc to paper CH and CN index variations scale linearly with the mean unsigned magnetic field B.
Appendix B scales 200 G simulation results by B/200 up to 3000 G; this linearization is the quantitative bridge to globular cluster amplitude.
domain assumption Starspot spectra can be approximated by 1D atmospheres 2000 K cooler than the quiet photosphere.
Appendix B models spots with 1D model grids rather than MHD, following Smitha et al. 2025; spot contrast directly affects the combined simulation.
domain assumption All low-mass globular cluster stars possess convective envelopes that generate solar-like surface magnetism.
Section 5 and Appendix C extend the solar mechanism to globular cluster stars via the Kraft break and convective-envelope criterion.
ad hoc to paper Dynamical encounters in dense cluster cores sustain rapid rotation and enhanced magnetic activity over cosmic timescales.
Appendix H invokes angular momentum injection to explain a permanent 1P/2P magnetic split, supported only by BY Dra rotation periods and encounter rates, not by direct magnetic measurements of globular cluster stars.

invented entities (1)

MAGISTER FAS framework
purpose: A named hypothesis that magnetic activity, faculae and spots generate the observed 1P/2P-like spectroscopic and photometric signatures without chemical pollution.
The acronym is introduced in Section 5 and used throughout the appendices; it is a label for the authors' proposed mechanism rather than a measurable physical entity, and no independent observable is associated with it beyond the solar analogies already used.

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Cite this review

Pith. "Pith review of Something new under the Sun: A magnetically driven CH/CN anti-correlation." pith.science (2026). https://pith.science/paper/UUKYODRR

@misc{pith2026260802721,
  author       = {Pith},
  title        = {Pith review of: Something new under the Sun: A magnetically driven CH/CN anti-correlation},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/UUKYODRR}},
  note         = {Machine review of arXiv:2608.02721}
}

read the original abstract

Spectroscopic monitoring surveys have shown that the magnetic cycle alters the photospheric structure of the Sun, perturbing the formation of molecular lines. In parallel, the study of Globular Clusters has remained centred on the multiple stellar populations conundrum, a phenomenon defined-most notably-by the anti-correlation between CH and CN molecular bands, serving to distinguish between first-population and second-population stars. We systematically monitored the behaviour of the CH and CN molecular bands as a function of the solar magnetic cycle. We demonstrate that the disc-integrated solar spectrum exhibits a distinct CH/CN anti-correlation driven by the magnetic cycle. Our results suggest that the spectroscopic and photometric anomalies defining the multiple populations conundrum may be physically linked to a differential spectral response to varying degrees of surface magnetic coverage.

Figures

Figures reproduced from arXiv: 2608.02721 by the authors.

**Figure 1.** Illustration of the discovery of the solar CH/CN anti-correlation from space- and ground-based observations. Panel a displays the spots (left Y-axis) and faculae (right Y-axis) fractional filling factors as a function of time during the Sun’s 23rd magnetic cycle. Panels b and c display the corresponding mirror-like variability in the CN and CH indices. Panel d displays the resultant CH/CN anti-correlation as detect… view at source ↗

**Figure 2.** Illustration of the MP conundrum in GCs. Panel a displays the classical colour-magnitude diagram of NGC104, where a single red giant branch and a single red horizontal branch sequence are visible. Panel b re-plots the same stars using S-PLUS narrow-band filters, revealing two distinct sub-populations. Panel c provides a zoomed-in view of the newly uncovered double-deck red-HB morphology, highlighting the (Villanova… view at source ↗

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Works this paper leans on

298 extracted references · 41 canonical work pages

[1]

Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars. , year = 1967, month = nov, volume =. doi:10.1086/149359 , adsurl =

doi:10.1086/149359 1967
[2]

, keywords =

Expanding the Time Domain of Multiple Populations: Evidence of Nitrogen Variations in the 1.5 Gyr Old Star Cluster NGC 1783. , keywords =. doi:10.3847/2041-8213/ac424a , archivePrefix =. 2112.06964 , primaryClass =

arXiv
[3]

, keywords =

Relative Frequencies of Blue Stragglers in Galactic Globular Clusters: Constraints for the Formation Mechanisms. , keywords =. doi:10.1086/383617 , archivePrefix =. astro-ph/0402592 , primaryClass =

arXiv
[4]

, keywords =

The Gaia-ESO Survey: No sign of multiple stellar populations in open clusters from their sodium and oxygen abundances. , keywords =. doi:10.1051/0004-6361/202245144 , archivePrefix =. 2406.07022 , primaryClass =

arXiv
[5]

, keywords =

Globular cluster chemistry in fast-rotating dwarf stars belonging to intermediate-age open clusters. , keywords =. doi:10.1051/0004-6361/201732351 , archivePrefix =. 1802.06654 , primaryClass =

arXiv
[6]

Sodium abundance variations within the 2-Gyr-old cluster NGC 1978

Leveraging HST with MUSE - I. Sodium abundance variations within the 2-Gyr-old cluster NGC 1978. , keywords =. doi:10.1093/mnras/staa2748 , archivePrefix =. 2009.03320 , primaryClass =

arXiv 1978
[7]

, keywords =

On the Nitrogen variation in 2 Gyr old massive star clusters in the large Magellanic Cloud. , keywords =. doi:10.1093/mnras/stab1590 , archivePrefix =. 2106.02054 , primaryClass =

arXiv
[8]

, keywords =

Age as a major factor in the onset of multiple populations in stellar clusters. , keywords =. doi:10.1093/mnras/stx2556 , archivePrefix =. 1710.00831 , primaryClass =

arXiv

Show all 298 references

[9]

Annual Review of Astronomy and Astrophysics , year =

Tests of Stellar Evolution Models by Means of Globular Clusters. Annual Review of Astronomy and Astrophysics , year =
[10]

, keywords =

New developments in understanding the HR diagram. , keywords =. doi:10.1146/annurev.aa.30.090192.001315 , adsurl =
[11]

, keywords =

Dynamical Formation of Close Binary Systems in Globular Clusters. , keywords =. doi:10.1086/377074 , archivePrefix =. astro-ph/0305003 , primaryClass =

arXiv
[12]

, keywords =

A Deep Chandra Survey of the Globular Cluster 47 Tucanae: Catalog of Point Sources. , keywords =. doi:10.1086/429899 , archivePrefix =. astro-ph/0503132 , primaryClass =

arXiv
[13]

International Conference on Binaries: in celebration of Ron Webbink's 65th Birthday , year = 2010, editor =

X-ray Sources in Galactic Globular Clusters. International Conference on Binaries: in celebration of Ron Webbink's 65th Birthday , year = 2010, editor =. doi:10.1063/1.3536355 , archivePrefix =. 1101.5356 , primaryClass =

2010 arXiv
[14]

2012 , publisher=

Stellar Structure and Evolution , author=. 2012 , publisher=

2012
[15]

Living Reviews in Solar Physics , volume=

Starspots: A Key to the Stellar Dynamo , author=. Living Reviews in Solar Physics , volume=. 2005 , publisher=

2005
[16]

Living Reviews in Solar Physics , volume=

Observations of Stellar Magnetic Fields , author=. Living Reviews in Solar Physics , volume=. 2012 , publisher=

2012
[17]

, keywords =

Ap stars with resolved magnetically split lines: Magnetic field determinations from Stokes I and V spectra. , keywords =. doi:10.1051/0004-6361/201628429 , archivePrefix =. 1612.03632 , primaryClass =

arXiv
[18]

, keywords =

The incidence of magnetism in blue and yellow straggler stars. , keywords =. doi:10.1051/0004-6361/202556166 , archivePrefix =. 2509.02304 , primaryClass =

arXiv
[19]

, keywords =

Two distinct sequences of blue straggler stars in the globular cluster M 30. , keywords =. doi:10.1038/nature08607 , archivePrefix =. 1001.1096 , primaryClass =

arXiv
[20]

, keywords =

A Survey of Stellar Families: Multiplicity of Solar-type Stars. , keywords =. doi:10.1088/0067-0049/190/1/1 , archivePrefix =. 1007.0414 , primaryClass =

arXiv
[21]

, keywords =

Stellar mergers as the origin of magnetic massive stars. , keywords =. doi:10.1038/s41586-019-1621-5 , archivePrefix =. 1910.14058 , primaryClass =

1910 arXiv
[22]

, keywords =

A catalogue of masses, structural parameters, and velocity dispersion profiles of 112 Milky Way globular clusters. , keywords =. doi:10.1093/mnras/sty1057 , archivePrefix =. 1804.08359 , primaryClass =

arXiv
[23]

, keywords =

Binary properties of the globular cluster 47 Tuc (NGC 104): A dearth of short-period binaries. , keywords =. doi:10.1051/0004-6361/202450709 , archivePrefix =. 2412.13189 , primaryClass =

arXiv
[24]

, keywords =

Reconstruction of solar UV irradiance in cycle 23. , keywords =. doi:10.1051/0004-6361:20064809 , adsurl =

doi
[25]

, title = "

Usoskin, Ilya G. , title = ". Living Reviews in Solar Physics , year =. doi:10.1007/s41116-017-0006-9 , adsurl =

doi
[26]

, keywords =

^ 22 Ne and ^ 23 Na ejecta from intermediate-mass stars: the impact of the new LUNA rate for ^ 22 Ne(p, ) ^ 23 Na. , keywords =. doi:10.1093/mnras/stw3029 , archivePrefix =. 1611.07742 , primaryClass =

arXiv
[27]

, keywords =

At least one in a dozen stars shows evidence of planetary ingestion. , keywords =. doi:10.1038/s41586-024-07091-y , archivePrefix =. 2403.13209 , primaryClass =

arXiv
[28]

, keywords =

The peculiar composition of the Sun is not related to giant planets. , keywords =. doi:10.1051/0004-6361/202554267 , archivePrefix =. 2505.22615 , primaryClass =

arXiv
[29]

, keywords =

Monitoring the Solar Temperature: Spectroscopic Temperature Variations of the Sun. , keywords =. doi:10.1086/303489 , adsurl =

doi
[30]

arXiv e-prints , keywords =

Improving Our Knowledge of the Solar Near-Surface Shear Layer: The Special Case of the Leptocline. arXiv e-prints , keywords =. doi:10.48550/arXiv.2501.08021 , archivePrefix =. 2501.08021 , primaryClass =

doi arXiv
[31]

, keywords =

Changes in the Subsurface Stratification of the Sun with the 11-Year Activity Cycle. , keywords =. doi:10.1086/498305 , archivePrefix =. astro-ph/0510111 , primaryClass =

arXiv
[32]

, keywords =

Solar Cycle Onset Seen in SOHO Michelson Doppler Imager Seismic Data. , keywords =. doi:10.1086/306498 , adsurl =

doi
[33]

, keywords =

First Calculations of Starspot Spectra Based on 3D Radiative Magnetohydrodynamics Simulations. , keywords =. doi:10.3847/2041-8213/ad9aaa , archivePrefix =. 2411.14056 , primaryClass =

arXiv
[34]

, keywords =

Are solar brightness variations faculae- or spot-dominated?. , keywords =. doi:10.1051/0004-6361/201527527 , archivePrefix =. 1602.04447 , primaryClass =

arXiv
[35]

Solar astrophysics, 3rd, Revised Edition
[36]

Living Reviews in Solar Physics , keywords =

The Solar Cycle. Living Reviews in Solar Physics , keywords =. doi:10.12942/lrsp-2010-1 , adsurl =

2010 doi
[37]

, keywords =

Does the solar oxygen abundance change over the solar cycle?: An investigation into activity-induced variations in the O I infrared triplet. , keywords =. doi:10.1051/0004-6361/202557598 , archivePrefix =. 2601.15919 , primaryClass =
[38]

, year = 2016, volume =

State of the Field: Extreme Precision Radial Velocities. , year = 2016, volume =

2016
[39]

, year = 2014, volume =

An Earth-mass planet in a 1-day orbit around Centauri B. , year = 2014, volume =

2014
[40]

, year = 2022, volume =

Observing the Sun as a Star: Design and Early Results from the NEID Solar Feed. , year = 2022, volume =

2022
[41]

Effect of spots and plages on radial velocity measurements

Using the Sun to estimate Earth-mass planets detection capabilities . Effect of spots and plages on radial velocity measurements. , year = 2010, volume =

2010
[42]

, year = 2019, volume =

HARPS-N Solar RVs Are Dominated by Large, Bright Magnetic Regions. , year = 2019, volume =

2019
[43]

, year = 2019, volume =

Global versus local PCA of solar active regions and application to HARPS-N extreme-precision radial velocities. , year = 2019, volume =

2019
[44]

, year = 2020, volume =

YARARA: Significant improvement in RV precision through PCA reduction of the spectral time-series. , year = 2020, volume =

2020
[45]

Activity time series of old stars from late F to early K. I. Simulating radial velocity, astrometry, photometry, and chromospheric emission. , year = 2017, volume =

2017
[46]

, year = 2022, volume =

Spectral Line Depth Variability in Radial Velocity Spectra. , year = 2022, volume =

2022
[47]

The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. III. A Quintuple Stellar Population in NGC 2808. , keywords =. doi:10.1088/0004-637X/808/1/51 , archivePrefix =. 1505.05934 , primaryClass =

arXiv
[48]

Lessons learned from the Milky Way globular clusters

Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters. , year = 2012, volume =

2012
[49]

A&A, submitted (arXiv:2607.05651) , year = 2026, month = jul, adsurl =

Hints of enhanced magnetic activity after the intermediate rotation period gap as traced by the chromospheric Ca II infrared triplet. A&A, submitted (arXiv:2607.05651) , year = 2026, month = jul, adsurl =

2026 arXiv
[50]

The Atlas of multiple stellar populations

The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - IX. The Atlas of multiple stellar populations. , year = 2017, volume =

2017
[51]

, year = 2018, volume =

Multiple Stellar Populations in Globular Clusters. , year = 2018, volume =

2018
[52]

, year = 2020, volume =

Multiple populations in star clusters. , year = 2020, volume =

2020
[53]

Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II , year = 2012, editor =

Design of the J-PAS and J-PLUS filter systems. Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II , year = 2012, editor =. doi:10.1117/12.925430 , adsurl =

2012 doi
[54]

The case of 47 Tuc (NGC 104) and the effect of the first dredge-up: Implications for the isochrone fitting

C and N abundances in globular clusters: I. The case of 47 Tuc (NGC 104) and the effect of the first dredge-up: Implications for the isochrone fitting. , keywords =. doi:10.1051/0004-6361/202554531 , archivePrefix =. 2506.11278 , primaryClass =

arXiv
[55]

, keywords =

The globular cluster M10: reassessment of stellar membership, distance, and age using its variable and HB stars. , keywords =. doi:10.1093/mnras/staa2977 , archivePrefix =. 2009.11927 , primaryClass =

2009 arXiv
[56]

, keywords =

To grow old and peculiar: Survey of anomalous variable stars in M80 with age determinations using K2 and Gaia. , keywords =. doi:10.1051/0004-6361/202346507 , archivePrefix =. 2308.01560 , primaryClass =

arXiv
[57]

arXiv e-prints , keywords =

Discovery of three magnetic helium-rich hot subdwarfs with SALT. arXiv e-prints , keywords =. doi:10.48550/arXiv.2410.02737 , archivePrefix =. 2410.02737 , primaryClass =

doi arXiv
[58]

2024 , eprint=

X-Ray, UV, and Optical Observations of Proxima Centauri's Stellar Cycle , author=. 2024 , eprint=

2024
[59]

Research Notes of the American Astronomical Society , keywords =

MPS-ATLAS Library of Stellar Model Atmospheres and Spectra. Research Notes of the American Astronomical Society , keywords =. doi:10.3847/2515-5172/acc180 , archivePrefix =. 2303.02685 , primaryClass =

arXiv
[60]

A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands

Stellar limb darkening. A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands. , keywords =. doi:10.1051/0004-6361/202243722 , archivePrefix =. 2206.06641 , primaryClass =

arXiv
[61]

, keywords =

Testing MURaM and MPS-ATLAS against the quiet solar spectrum. , keywords =. doi:10.1051/0004-6361/202346099 , archivePrefix =. 2310.05652 , primaryClass =

arXiv
[62]

, keywords =

MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra. , keywords =. doi:10.1051/0004-6361/202140275 , archivePrefix =. 2105.13611 , primaryClass =

arXiv
[63]

Small-scale dynamo in cool stars. II. The effect of metallicity. , keywords =. doi:10.1051/0004-6361/202244771 , archivePrefix =. 2211.02722 , primaryClass =

arXiv
[64]

Equations, methods, and results of the MURaM code

Simulations of magneto-convection in the solar photosphere. Equations, methods, and results of the MURaM code. , keywords =. doi:10.1051/0004-6361:20041507 , adsurl =

doi
[65]

, keywords =

Reconstruction of total and spectral solar irradiance from 1974 to 2013 based on KPVT, SoHO/MDI, and SDO/HMI observations. , keywords =. doi:10.1051/0004-6361/201423628 , archivePrefix =. 1408.1229 , primaryClass =

1974 arXiv
[66]

Nature Astronomy , keywords =

A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST. Nature Astronomy , keywords =. doi:10.1038/s41550-024-02298-5 , archivePrefix =. 2310.15895 , primaryClass =

arXiv
[67]

Astrophysics and Space Science Library , year = 2015, editor =

The Blue Straggler Population in Dwarf Galaxies. Astrophysics and Space Science Library , year = 2015, editor =. doi:10.1007/978-3-662-44434-4_6 , archivePrefix =. 1406.3472 , primaryClass =

2015 arXiv
[68]

arXiv e-prints , keywords =

Solar internetwork magnetic fields: Statistical comparison between observations and MHD simulations. arXiv e-prints , keywords =. doi:10.48550/arXiv.2410.01613 , archivePrefix =. 2410.01613 , primaryClass =

doi arXiv
[69]

, keywords =

Magnetic Field Amplification during Stellar Collisions between Low-mass Stars. , keywords =. doi:10.3847/2041-8213/adaf94 , archivePrefix =. 2410.00148 , primaryClass =

arXiv
[70]

, keywords =

Blue Stragglers After the Main Sequence. , keywords =. doi:10.1088/0004-637X/692/2/1411 , archivePrefix =. 0811.2974 , primaryClass =

arXiv
[71]

, year = 1976, month = feb, volume =

Stellar Collisions in Globular Clusters. , year = 1976, month = feb, volume =

1976
[72]

2026 , eprint=

Revealing alpha-Element's Past with Subaru/IRD: Oxygen Abundance of 35 Very Metal-Poor Stars from Near-IR OH lines , author=. 2026 , eprint=

2026
[73]

Accepted for publication in the Astrophysical Journal (arXiv:2606.19854) , year = 2026, month = jun, adsurl =

The curious case of dark faculae on M dwarf stars. Accepted for publication in the Astrophysical Journal (arXiv:2606.19854) , year = 2026, month = jun, adsurl =

2026 arXiv
[74]

, keywords =

Grand minima and maxima of solar activity: new observational constraints. , keywords =. doi:10.1051/0004-6361:20077704 , archivePrefix =. 0706.0385 , primaryClass =

arXiv
[75]

A&A, submitted (arXiv:2606.26283) , year = 2026, month = jun, adsurl =

Six decades of TIGRE and Mount Wilson chromospheric monitoring in the H and K lines: the quest for an understanding of solar-type activity. A&A, submitted (arXiv:2606.26283) , year = 2026, month = jun, adsurl =

2026 arXiv
[76]

Globular clusters in the time of the JWST . I. Survey design and first results on multiple populations and beyond. MNRAS, submitted (arXiv:2606.20979) , year = 2026, month = jun, adsurl =

2026 arXiv
[77]

A&A, in press (arXiv:2606.21912) , year = 2026, month = jun, adsurl =

Effect of surface magnetic fields on limb darkening in main-sequence stars. A&A, in press (arXiv:2606.21912) , year = 2026, month = jun, adsurl =

2026 arXiv
[78]

, keywords =

The magnetic fields at the surface of active single G-K giants. , keywords =. doi:10.1051/0004-6361/201424579 , archivePrefix =. 1411.6230 , primaryClass =

arXiv
[79]

, keywords =

Modeling the cyclic modulation of photospheric lines. , keywords =. doi:10.1051/0004-6361:20053405 , adsurl =

doi
[80]

, keywords =

Total Solar Irradiance during the Last Five Centuries. , keywords =. doi:10.3847/1538-4357/ac8a4b , archivePrefix =. 2209.10115 , primaryClass =

arXiv
[81]

, keywords =

Reconstruction of the Total Solar Irradiance During the Last Millennium. , keywords =. doi:10.3847/1538-4357/ad7c49 , archivePrefix =. 2409.12648 , primaryClass =

arXiv
[82]

arXiv e-prints , keywords =

Deciphering Solar Magnetic Activity: Some (Unpopular) Thoughts On the Coupling of the Sun's ``Weather'' and ``Climate''. arXiv e-prints , keywords =. doi:10.48550/arXiv.2408.10354 , archivePrefix =. 2408.10354 , primaryClass =

doi arXiv
[83]

Journal of the British Astronomical Association , year = 1966, month = jun, volume =

Ascent and Descent in the Eighty-Year Cycles of Solar Activity. Journal of the British Astronomical Association , year = 1966, month = jun, volume =

1966
[84]

, keywords =

Signatures of intrinsic Li depletion and Li-Na anti-correlation in the metal-poor globular cluster NGC 6397. , keywords =. doi:10.1051/0004-6361/200912524 , archivePrefix =. 0906.2876 , primaryClass =

arXiv
[85]

, keywords =

An Analysis of G-Band Strengths in NGC 6397 and M55 Red Giants. , keywords =. doi:10.1086/169066 , adsurl =

doi
[86]

, keywords =

Mixing processes during the evolution of red giants with moderate metal deficiencies: the role of molecular-weight barriers. , keywords =. doi:10.48550/arXiv.astro-ph/9712207 , archivePrefix =. astro-ph/9712207 , primaryClass =

doi arXiv
[87]

arXiv e-prints , keywords =

A combined study of thermohaline mixing and envelope overshooting with PARSEC: Calibration to NGC 6397 and M4. arXiv e-prints , keywords =. doi:10.48550/arXiv.2408.05039 , archivePrefix =. 2408.05039 , primaryClass =

doi arXiv
[88]

, keywords =

Asteroseismology of the multiple stellar populations in the globular cluster M4. , keywords =. doi:10.1051/0004-6361/202243721 , archivePrefix =. 2205.06645 , primaryClass =

arXiv
[89]

, keywords =

First asteroseismic analysis of the globular cluster M80: multiple populations and stellar mass-loss. , keywords =. doi:10.1093/mnras/stad3565 , archivePrefix =. 2307.07158 , primaryClass =

arXiv
[90]

, keywords =

The 10830 A Helium Line Among Evolved Stars in the Globular Cluster M4. , keywords =. doi:10.1088/0004-637X/808/2/124 , archivePrefix =. 1506.06307 , primaryClass =

arXiv
[91]

, keywords =

X-shooter Observations of Main-sequence Stars in the Globular Cluster NGC 2808: First Chemical Tagging of a He-normal and a He-rich Dwarf. , keywords =. doi:10.1088/2041-8205/720/1/L41 , archivePrefix =. 1007.5299 , primaryClass =

arXiv
[92]

, keywords =

Direct Evidence for an Enhancement of Helium in Giant Stars in Omega Centauri. , keywords =. doi:10.1088/0004-637X/728/2/155 , archivePrefix =. 1012.4802 , primaryClass =

arXiv
[93]

arXiv e-prints , keywords =

Exploring Simple-Population and Multiple-Population Globular Clusters in the Outer Galactic Halo using the Hubble Space Telescope. arXiv e-prints , keywords =. doi:10.48550/arXiv.2406.16824 , archivePrefix =. 2406.16824 , primaryClass =

doi arXiv
[94]

arXiv e-prints , keywords =

Simultaneous spectropolarimetric observations in the H and Ca II 8662 A lines of an active region. arXiv e-prints , keywords =. doi:10.48550/arXiv.2406.02083 , archivePrefix =. 2406.02083 , primaryClass =

doi arXiv
[95]

, keywords =

New Density Profile and Structural Parameters of the Complex Stellar System Terzan 5. , keywords =. doi:10.1088/0004-637X/717/2/653 , archivePrefix =. 1005.2847 , primaryClass =

arXiv
[96]

arXiv e-prints , keywords =

Magnetograms underestimate even unipolar magnetic flux nearly everywhere on the solar disk. arXiv e-prints , keywords =. doi:10.48550/arXiv.2407.08368 , archivePrefix =. 2407.08368 , primaryClass =

doi arXiv
[97]

DOT tomography of the solar atmosphere. III. Observations and simulations of reversed granulation. , keywords =. doi:10.1051/0004-6361:20041714 , adsurl =

doi
[98]

arXiv e-prints , keywords =

Brightness Contrast of Solar Magnetic Elements Observed by Sunrise. arXiv e-prints , keywords =. doi:10.48550/arXiv.2109.00057 , archivePrefix =. 2109.00057 , primaryClass =

doi arXiv
[99]

, keywords =

The origin of the reversed granulation in the solar photosphere. , keywords =. doi:10.1051/0004-6361:20066390 , archivePrefix =. astro-ph/0612464 , primaryClass =

arXiv
[100]

DOT tomography of the solar atmosphere. II. Reversed granulation in Ca II H. , keywords =. doi:10.1051/0004-6361:20035636 , adsurl =

doi
[101]

Dynamics of the solar photosphere with IBIS. I. Reversed intensity structure in the mid-photosphere. , year = 2006, month = apr, volume =. doi:10.1051/0004-6361:20054310 , adsurl =

2006 doi
[102]

, keywords =

Observed Oddities in the Lines H, K, b and H&beta. , keywords =. doi:10.1007/BF00153101 , adsurl =

doi
[103]

Science , keywords =

Deep Mixing of ^ 3 He: Reconciling Big Bang and Stellar Nucleosynthesis. Science , keywords =. doi:10.1126/science.1133065 , archivePrefix =. astro-ph/0611039 , primaryClass =

arXiv
[104]

, keywords =

Thermohaline mixing in evolved low-mass stars. , keywords =. doi:10.1051/0004-6361/201014305 , archivePrefix =. 1006.1354 , primaryClass =

arXiv
[105]

, keywords =

Thermohaline mixing: a physical mechanism governing the photospheric composition of low-mass giants. , keywords =. doi:10.1051/0004-6361:20077274 , archivePrefix =. astro-ph/0703302 , primaryClass =

arXiv
[106]

The California-Kepler Survey. XI. A Survey of Chromospheric Activity through the Lens of Precise Stellar Properties. , keywords =. doi:10.3847/1538-4357/ad077b , archivePrefix =. 2401.10864 , primaryClass =

arXiv
[107]

Chromospheric Variations in Main-Sequence Stars. II. , keywords =. doi:10.1086/175072 , adsurl =

doi
[108]

, keywords =

Evidence for long-term brightness changes of solar-type stars. , keywords =. doi:10.1038/348520a0 , adsurl =

doi
[109]

, year = 1968, month = jul, volume =

Flux Measurements at the Centers of Stellar H- and K-Lines. , year = 1968, month = jul, volume =. doi:10.1086/149652 , adsurl =

1968 doi
[110]

, keywords =

Primordial ^ 4 He abundance: a determination based on the largest sample of H II regions with a methodology tested on model H II regions. , keywords =. doi:10.1051/0004-6361/201220782 , archivePrefix =. 1308.2100 , primaryClass =

arXiv
[111]

, keywords =

Chemical separation in horizontal-branch stars. , keywords =. doi:10.1086/160864 , adsurl =

doi
[112]

, keywords =

Chemical Analysis of Asymptotic Giant Branch Stars in M62. , keywords =. doi:10.1088/0004-637X/813/2/97 , archivePrefix =. 1509.08917 , primaryClass =

arXiv
[113]

, keywords =

Sodium content as a predictor of the advanced evolution of globular cluster stars. , keywords =. doi:10.1038/nature12191 , archivePrefix =. 1305.7090 , primaryClass =

arXiv
[114]

, keywords =

An extreme paucity of second population AGB stars in the `normal' globular cluster M4. , keywords =. doi:10.1093/mnrasl/slw073 , archivePrefix =. 1604.05040 , primaryClass =

arXiv
[115]

, keywords =

Chemical and Kinematical Properties of Blue Straggler Stars and Horizontal Branch Stars in NGC 6397. , keywords =. doi:10.1088/0004-637X/754/2/91 , archivePrefix =. 1205.5561 , primaryClass =

arXiv
[116]

, keywords =

On the missing second generation AGB stars in NGC 6752. , keywords =. doi:10.1051/0004-6361/201424540 , archivePrefix =. 1410.3599 , primaryClass =

arXiv
[117]

, keywords =

AGB subpopulations in the nearby globular cluster NGC 6397. , keywords =. doi:10.1093/mnras/stx3217 , archivePrefix =. 1712.03340 , primaryClass =

arXiv
[118]

, keywords =

A JWST Project on 47 Tucanae: NIRSpec Spectroscopy of Multiple Populations among M Dwarfs. , keywords =. doi:10.3847/2041-8213/ad527b , archivePrefix =. 2406.12684 , primaryClass =

arXiv
[119]

arXiv e-prints , keywords =

Discrepancies between spectroscopy and HST photometry in tagging multiple stellar populations in 22 globular clusters. arXiv e-prints , keywords =. doi:10.48550/arXiv.2406.06683 , archivePrefix =. 2406.06683 , primaryClass =

doi arXiv
[120]

Multiple Stellar Populations of Globular Clusters from Homogeneous Ca-CN-CH-NH Photometry. VII. Metal-poor Populations in 47 Tucanae (NGC 104). , keywords =. doi:10.3847/1538-4365/ac9795 , archivePrefix =. 2210.12332 , primaryClass =

arXiv
[121]

, year = 1978, month = aug, volume =

Spectral Inhomogeneities in Faint 47 Tucanae Stars. , year = 1978, month = aug, volume =. doi:10.1086/182742 , adsurl =

1978 doi
[122]

Updated BaSTI Stellar Evolution Models and Isochrones. II. -enhanced Calculations. , keywords =. doi:10.3847/1538-4357/abd4d5 , archivePrefix =. 2012.10085 , primaryClass =

2012
[123]

, keywords =

NGC 6441: another indication of very high helium content in globular cluster stars. , keywords =. doi:10.1051/0004-6361:20066074 , archivePrefix =. astro-ph/0610406 , primaryClass =

arXiv
[124]

, year = 1977, month = apr, volume =

Cyanogen strengths and ultraviolet excesses of evolved stars in 17 globular clusters from DDO photometry. , year = 1977, month = apr, volume =. doi:10.1086/190438 , adsurl =

1977 doi
[125]

, year = 1968, month = jan, volume =

Magnetic braking by a stellar wind-I. , year = 1968, month = jan, volume =. doi:10.1093/mnras/138.3.359 , adsurl =

1968 doi
[126]

, keywords =

Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic. , keywords =. doi:10.1088/0004-637X/776/2/67 , archivePrefix =. 1306.3701 , primaryClass =

arXiv
[127]

, keywords =

Scaling and Evolution of Stellar Magnetic Activity. , keywords =. doi:10.1007/s11214-023-01016-3 , archivePrefix =. 2310.09515 , primaryClass =

arXiv
[128]

, keywords =

Amplification of Brightness Variability by Active-region Nesting in Solar-like Stars. , keywords =. doi:10.3847/2041-8213/abb409 , archivePrefix =. 2009.00692 , primaryClass =

2009 arXiv
[129]

, keywords =

The Mg 280-nm doublet as a monitor of changes in solar ultraviolet irradiance. , keywords =. doi:10.1029/JD091iD08p08672 , adsurl =

doi
[130]

arXiv e-prints , keywords =

The Ca II K index-Mg II index relation: A Hilbert-Huang Transform approach. arXiv e-prints , keywords =
[131]

, year = 2018, month = apr, volume =

Studies of FCAPT uvby Photometry with Period04: The mCP Stars HD 5797, HD 36792, HD 27309, HD 47913, HD 74521, HD 120198, HD 171263, and HD 215441. , year = 2018, month = apr, volume =. doi:10.1088/1538-3873/aaa952 , adsurl =

2018 doi
[132]

, keywords =

Most Rotational Variables Dominated by a Single Bright Feature Are ^ 2 CVn Stars. , keywords =. doi:10.3847/1538-3881/acf7c0 , archivePrefix =. 2309.04905 , primaryClass =

arXiv
[133]

, keywords =

A Solar Dynamo Surface Wave at the Interface between Convection and Nonuniform Rotation. , keywords =. doi:10.1086/172631 , adsurl =

doi
[134]

arXiv e-prints , keywords =

The solar dynamo begins near the surface. arXiv e-prints , keywords =. doi:10.48550/arXiv.2404.07740 , archivePrefix =. 2404.07740 , primaryClass =

doi arXiv
[135]

The ACS Survey of Galactic Globular Clusters. VII. Relative Ages. , keywords =. doi:10.1088/0004-637X/694/2/1498 , archivePrefix =. 0812.4541 , primaryClass =

arXiv
[136]

The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon. , keywords =. doi:10.1088/0004-637X/708/1/698 , archivePrefix =. 0911.2469 , primaryClass =

arXiv
[137]

, keywords =

Horizontal branch morphology: A new photometric parametrization. , keywords =. doi:10.1051/0004-6361/201935995 , archivePrefix =. 1907.09568 , primaryClass =

1907 arXiv
[138]

arXiv e-prints , keywords =

Over 200 globular clusters in the Milky Way and still none with super-Solar metallicity. arXiv e-prints , keywords =. doi:10.48550/arXiv.2405.05055 , archivePrefix =. 2405.05055 , primaryClass =

doi arXiv
[139]

Globular clusters in the Gaia era

Homogeneous photometry - VII. Globular clusters in the Gaia era. , keywords =. doi:10.1093/mnras/stz585 , archivePrefix =. 1902.09925 , primaryClass =

1902 arXiv
[140]

Mosaic wide-field multi-band photometry

The anomalous Galactic globular cluster NGC 2808. Mosaic wide-field multi-band photometry. , keywords =
[141]

, keywords =

Multimodal Distributions along the Horizontal Branch. , keywords =. doi:10.1086/305712 , archivePrefix =. astro-ph/9708210 , primaryClass =

arXiv
[142]

, keywords =

The Helium Abundance in the Metal-poor Globular Clusters M30 and NGC 6397. , keywords =. doi:10.1088/0004-637X/786/1/14 , archivePrefix =. 1403.0595 , primaryClass =

arXiv
[143]

, keywords =

The Helium Content of Globular Clusters: NGC 6121 (M4). , keywords =. doi:10.1088/0004-637X/748/1/62 , archivePrefix =. 1201.3241 , primaryClass =

arXiv
[144]

, keywords =

Chemical Abundances along the 1G Sequence of the Chromosome Maps: The Globular Cluster NGC 3201. , keywords =. doi:10.3847/1538-4357/ab53d9 , archivePrefix =. 1910.02892 , primaryClass =

1910 arXiv
[145]

arXiv e-prints , keywords =

On the original composition of the gas forming first-generation stars in clusters: insights from HST and JWST. arXiv e-prints , keywords =. doi:10.48550/arXiv.2405.02006 , archivePrefix =. 2405.02006 , primaryClass =

doi arXiv
[146]

arXiv e-prints , keywords =

The Fe i lines and the chromospheric activity. arXiv e-prints , keywords =. doi:10.48550/arXiv.2405.02976 , archivePrefix =. 2405.02976 , primaryClass =

doi arXiv
[147]

arXiv e-prints , keywords =

Magnetochronology of solar-type star dynamos. arXiv e-prints , keywords =. doi:10.48550/arXiv.2401.14460 , archivePrefix =. 2401.14460 , primaryClass =

doi arXiv
[148]

, keywords =

Comparing Observed with Simulated Solar-disk-center Scattering Polarization in the Sr I 4607 A Line. , keywords =. doi:10.3847/1538-4357/ad26f9 , archivePrefix =. 2402.04736 , primaryClass =

arXiv
[149]

, keywords =

Using Bright Point Shapes to Constrain Wave Heating of the Solar Corona: Predictions for DKIST. , keywords =. doi:10.3847/1538-4357/ad2071 , archivePrefix =. 2402.10915 , primaryClass =

arXiv
[150]

Research in Astronomy and Astrophysics , keywords =

Long-term Evolution of Solar Activity and Prediction of the Following Solar Cycles. Research in Astronomy and Astrophysics , keywords =. doi:10.1088/1674-4527/ad1ed2 , archivePrefix =. 2402.13173 , primaryClass =

arXiv
[151]

arXiv e-prints , keywords =

Correlations between Ca II H&K Emission and the Gaia M dwarf Gap. arXiv e-prints , keywords =. doi:10.48550/arXiv.2402.14984 , archivePrefix =. 2402.14984 , primaryClass =

doi arXiv
[152]

, keywords =

Towards understanding dynamo action in M dwarfs. , keywords =. doi:10.1093/mnras/stv585 , archivePrefix =. 1503.04971 , primaryClass =

arXiv
[153]

, keywords =

The stellar rotation-activity relationship in fully convective M dwarfs. , keywords =. doi:10.1093/mnras/sty1670 , archivePrefix =. 1807.03304 , primaryClass =

arXiv
[154]

Differences in Luminosity and Mass Functions among Multiple Stellar Populations

The HST Large Programme on NGC \, 6752 -- V. Differences in Luminosity and Mass Functions among Multiple Stellar Populations. arXiv e-prints , keywords =. doi:10.48550/arXiv.2403.03262 , archivePrefix =. 2403.03262 , primaryClass =

doi arXiv
[155]

, keywords =

The Frequency of Binary Stars in the Core of 47 Tucanae. , keywords =. doi:10.1086/322353 , archivePrefix =. astro-ph/0105441 , primaryClass =

arXiv
[156]

Atoms , keywords =

The Shapes of Stellar Spectra. Atoms , keywords =. doi:10.3390/atoms11030061 , archivePrefix =. 2303.14340 , primaryClass =

arXiv
[157]

, keywords =

Data Release 2 of S-PLUS: Accurate template-fitting based photometry covering 1000 deg ^ 2 in 12 optical filters. , keywords =. doi:10.1093/mnras/stac284 , archivePrefix =. 2104.00020 , primaryClass =

arXiv
[158]

The effective temperature scale of giant stars (F0-K5). II. Empirical calibration of T _ eff versus colours and [Fe/H]. , keywords =. doi:10.1051/aas:1999521 , adsurl =

doi
[159]

Research in Astronomy and Astrophysics , keywords =

Main Sequence Star Super-flare Frequency based on Entire Kepler Data. Research in Astronomy and Astrophysics , keywords =. doi:10.1088/1674-4527/acdc09 , archivePrefix =. 2212.10224 , primaryClass =

arXiv
[160]

, keywords =

Mixed Populations in Globular Clusters: Et Tu, 47 Tuc?. , keywords =. doi:10.1088/0004-637X/697/1/L58 , archivePrefix =. 0904.1626 , primaryClass =

arXiv
[161]

Transiting Planets , year = 2009, editor =

CoRoT: Description of the Mission and Early Results. Transiting Planets , year = 2009, editor =. doi:10.1017/S1743921308026252 , adsurl =

2009 doi
[162]

, keywords =

Solar Cycle Related Changes at the Base of the Convection Zone. , keywords =. doi:10.1086/591514 , archivePrefix =. 0807.0442 , primaryClass =

arXiv
[163]

, keywords =

Emission of solar chromospheric and transition region features related to the underlying magnetic field. , keywords =. doi:10.1051/0004-6361/201731650 , archivePrefix =. 1807.02372 , primaryClass =

arXiv
[164]

, keywords =

Globular cluster mass-loss in the context of multiple populations. , keywords =. doi:10.1093/mnras/stv1661 , archivePrefix =. 1507.05634 , primaryClass =

arXiv
[165]

, keywords =

Five Decades of Chromospheric Activity in 59 Sun-like Stars and New Maunder Minimum Candidate HD 166620. , keywords =. doi:10.3847/1538-3881/ac5683 , archivePrefix =. 2203.13376 , primaryClass =

arXiv
[166]

, keywords =

Magnetic properties of G-band bright points in a sunspot moat. , keywords =. doi:10.1051/0004-6361:20065620 , archivePrefix =. 0707.1232 , primaryClass =

arXiv
[167]

, keywords =

Centauri: The Population Puzzle Goes Deeper. , keywords =. doi:10.1086/420847 , archivePrefix =. astro-ph/0403112 , primaryClass =

arXiv
[168]

Beeck, B. and. Three-dimensional simulations of near-surface convection in main-sequence stars. IV. Effect of small-scale magnetic flux concentrations on centre-to-limb variation and spectral lines. Astronomy & Astrophysics , year =. doi:10.1051/0004-6361/201525788 , archivePr...

arXiv
[169]

Three-dimensional simulations of near-surface convection in main-sequence stars. III. The structure of small-scale magnetic flux concentrations. , keywords =. doi:10.1051/0004-6361/201525788 , archivePrefix =. 1505.04739 , primaryClass =

arXiv
[170]

, keywords =

A New Color-Magnitude Diagram for 47 Tucanae: A Statistical Analysis. , keywords =. doi:10.1088/0004-6256/138/5/1455 , adsurl =

doi
[171]

, keywords =

On the Dynamics of Small-Scale Solar Magnetic Elements. , keywords =. doi:10.1086/177250 , adsurl =

doi
[172]

, keywords =

On the Relation of G-Band Bright Points to the Photospheric Magnetic Field. , keywords =. doi:10.1086/320663 , adsurl =

doi
[173]

, keywords =

Contrast Analysis of Solar Faculae and Magnetic Bright Points. , keywords =. doi:10.1086/517502 , adsurl =

doi
[174]

, keywords =

Hunting for Giant Cells in Deep Stellar Convective Zones Using Wavelet Analysis. , keywords =. doi:10.1088/0004-637X/728/2/115 , archivePrefix =. 1101.1943 , primaryClass =

1943 arXiv
[175]

Revised Catalog of GALEX Ultraviolet Sources. I. The All-Sky Survey: GUVcat\_AIS. , keywords =. doi:10.3847/1538-4365/aa7053 , archivePrefix =. 1704.05903 , primaryClass =

arXiv
[176]

, keywords =

Photographic photometry of RR Lyrae variables in the globular clusterM 15. , keywords =. doi:10.1093/mnras/209.4.765 , adsurl =

doi
[177]

Optical and IR Telescope Instrumentation and Detectors , year = 2000, editor =

Data-reduction software for GIRAFFE, the VLT medium-resolution multi-object fiber-fed spectrograph. Optical and IR Telescope Instrumentation and Detectors , year = 2000, editor =. doi:10.1117/12.395507 , adsurl =

doi
[178]

The Luminosity and Mass Functions of Low-mass Stars in the Galactic Disk. II. The Field. , keywords =. doi:10.1088/0004-6256/139/6/2679 , archivePrefix =. 1004.4002 , primaryClass =

arXiv
[179]

Science , keywords =

Kepler Planet-Detection Mission: Introduction and First Results. Science , keywords =. doi:10.1126/science.1185402 , adsurl =

doi
[180]

, keywords =

The Chromosphere Underneath a Coronal Bright Point. , keywords =. doi:10.3847/1538-4357/acb544 , archivePrefix =. 2301.08596 , primaryClass =

arXiv
[182]

, keywords =

CN and CH band strengths of 283 47 tucanae giants. , keywords =. doi:10.1086/118535 , adsurl =

doi
[183]

, keywords =

Calibration of the CH and CN Variations Among Main-Sequence Stars in M71 and in M13. , keywords =. doi:10.1086/321115 , archivePrefix =. astro-ph/0104099 , primaryClass =

arXiv
[184]

, keywords =

The Chemical Inhomogeneity of Faint M13 Stars: Carbon and Nitrogen Abundances. , keywords =. doi:10.1086/382100 , archivePrefix =. astro-ph/0312315 , primaryClass =

arXiv
[185]

, keywords =

On the Carbon and Nitrogen Abundances of 47 Tucanae's Main-Sequence Stars. , keywords =. doi:10.1086/381912 , archivePrefix =. astro-ph/0312316 , primaryClass =

arXiv
[186]

, keywords =

On Differential Rotation and Overshooting in Solar-like Stars. , keywords =. doi:10.3847/1538-4357/aa5c40 , archivePrefix =. 1702.06598 , primaryClass =

arXiv
[187]

, keywords =

Powering Stellar Magnetism: Energy Transfers in Cyclic Dynamos of Sun-like Stars. , keywords =. doi:10.3847/1538-4357/ac469b , archivePrefix =. 2201.13218 , primaryClass =
[188]

, keywords =

The GALAH+ survey: Third data release. , keywords =. doi:10.1093/mnras/stab1242 , archivePrefix =. 2011.02505 , primaryClass =

2011 arXiv
[189]

, keywords =

Mass motions and chromospheres of RGB stars in the globular cluster NGC 2808. , keywords =. doi:10.1051/0004-6361:20031508 , archivePrefix =. astro-ph/0309685 , primaryClass =

arXiv
[190]

, keywords =

JWST uncovers helium and water abundance variations in the bulge globular cluster NGC 6440. , keywords =. doi:10.1051/0004-6361/202347961 , archivePrefix =. 2310.13056 , primaryClass =

arXiv
[191]

arXiv e-prints , keywords =

The structural properties of multiple populations in globular clusters: the instructive case of NGC 3201. arXiv e-prints , keywords =. doi:10.48550/arXiv.2402.09514 , archivePrefix =. 2402.09514 , primaryClass =

doi arXiv
[192]

, keywords =

Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere. , keywords =. doi:10.1007/s11207-010-9541-4 , archivePrefix =. 1003.1190 , primaryClass =

arXiv
[193]

, keywords =

Carbon and nitrogen abundance variations on the main sequence of 47 Tucanae. , keywords =. doi:10.1046/j.1365-8711.1998.01671.x , adsurl =

1998
[194]

, keywords =

The Relationship between Infrared, Optical, and Ultraviolet Extinction. , keywords =. doi:10.1086/167900 , adsurl =

doi
[195]

, keywords =

Observational Manifestations of Solar Magnetoconvection: Center-to-Limb Variation. , keywords =. doi:10.1086/423305 , archivePrefix =. astro-ph/0406160 , primaryClass =

arXiv
[196]

, keywords =

Abundance analysis of turn-off and early subgiant stars in the globular cluster 47 Tuc (NGC 104). , keywords =. doi:10.1051/0004-6361:20034370 , archivePrefix =. astro-ph/0311347 , primaryClass =

arXiv
[197]

, keywords =

Abundances of C, N, O in slightly evolved stars in the globular clusters NGC 6397, NGC 6752 and 47 Tuc. , keywords =. doi:10.1051/0004-6361:20041892 , archivePrefix =. astro-ph/0411241 , primaryClass =

arXiv
[198]

, keywords =

The Link between Chemical Anomalies along the Red Giant Branch and the Horizontal Branch Extension in Globular Clusters. , keywords =. doi:10.1086/525021 , archivePrefix =. 0711.0248 , primaryClass =

arXiv
[199]

Na-O anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra. , keywords =. doi:10.1051/0004-6361/200912096 , archivePrefix =. 0909.2938 , primaryClass =

arXiv
[200]

, keywords =

A Str \"o mgren view of the multiple populations in globular clusters. , keywords =. doi:10.1051/0004-6361/201117180 , archivePrefix =. 1109.3199 , primaryClass =

arXiv
[201]

, keywords =

Five Groups of Red Giants with Distinct Chemical Composition in the Globular Cluster NGC 2808. , keywords =. doi:10.1088/0004-637X/810/2/148 , archivePrefix =. 1507.07553 , primaryClass =

arXiv
[202]

, keywords =

Empirical estimates of the Na-O anti-correlation in 95 Galactic globular clusters. , keywords =. doi:10.1051/0004-6361/201935110 , archivePrefix =. 1903.04494 , primaryClass =

1903 arXiv
[203]

, keywords =

On the Origin of Magnetic Fields in the Quiet Photosphere. , keywords =. doi:10.1086/311962 , adsurl =

doi
[204]

Stellar Models with Microscopic Diffusion and Rotational Mixing. II. Application to Open Clusters. , keywords =. doi:10.1086/175409 , archivePrefix =. astro-ph/9408059 , primaryClass =

arXiv
[205]

Living Reviews in Solar Physics , keywords =

Dynamo models of the solar cycle. Living Reviews in Solar Physics , keywords =. doi:10.1007/s41116-020-00025-6 , adsurl =

doi
[206]

, keywords =

Statistics of BY Draconis chromospheric variable stars. , keywords =. doi:10.1093/mnras/stac1660 , archivePrefix =. 2206.05505 , primaryClass =

arXiv
[207]

, keywords =

Solar Variability and the Relation of Facular to Sunspot Areas during Solar Cycle 22. , keywords =. doi:10.1086/304138 , adsurl =

doi
[208]

Frontiers in Astronomy and Space Sciences , keywords =

Full-disc Ca ii K observations A window to past solar magnetism. Frontiers in Astronomy and Space Sciences , keywords =. doi:10.3389/fspas.2022.1038949 , archivePrefix =. 2210.13285 , primaryClass =

2022
[209]

Journal of Atmospheric and Solar-Terrestrial Physics , keywords =

Long-term changes in solar activity and irradiance. Journal of Atmospheric and Solar-Terrestrial Physics , keywords =. doi:10.1016/j.jastp.2023.106150 , archivePrefix =. 2303.03046 , primaryClass =

2023
[210]

, keywords =

A new library of theoretical stellar spectra with scaled-solar and -enhanced mixtures. , keywords =. doi:10.1093/mnras/stu365 , archivePrefix =. 1404.3243 , primaryClass =

arXiv
[211]

, keywords =

Carbon and Nitrogen Abundances in Stars at the Base of the Red Giant Branch in M5. , keywords =. doi:10.1086/340179 , archivePrefix =. astro-ph/0112199 , primaryClass =

arXiv
[212]

, keywords =

Abundances in a Large Sample of Stars in M3 and M13. , keywords =. doi:10.1086/426369 , archivePrefix =. astro-ph/0409725 , primaryClass =

arXiv
[213]

, keywords =

Detailed Abundances for a Large Sample of Giant Stars in the Globular Cluster 47 Tucanae (NGC 104). , keywords =. doi:10.1088/0004-637X/780/1/94 , archivePrefix =. 1311.1541 , primaryClass =

arXiv
[214]

, keywords =

An Overview of the Rotational Behavior of Metal-poor Stars. , keywords =. doi:10.1088/0004-637X/704/1/750 , archivePrefix =. 1009.4951 , primaryClass =

arXiv
[215]

Intensity profiles of the solar activity components

Stellar surface information from the Ca II H&K lines - I. Intensity profiles of the solar activity components. , keywords =. doi:10.1093/mnras/stad3292 , archivePrefix =. 2310.15926 , primaryClass =

arXiv
[216]

Software and Cyberinfrastructure for Astronomy III , year = 2014, editor =

Data management pipeline and hardware facilities for J-PAS and J-PLUS surveys archiving and processing. Software and Cyberinfrastructure for Astronomy III , year = 2014, editor =. doi:10.1117/12.2055387 , adsurl =

2014 doi
[217]

, keywords =

Understanding Sun-as-a-Star Variability of Solar Balmer Lines. , keywords =. doi:10.3847/1538-4357/acd17d , archivePrefix =. 2305.05510 , primaryClass =

arXiv
[218]

Consequences on the horizontal branch morphology

Helium variation due to self-pollution among Globular Cluster stars. Consequences on the horizontal branch morphology. , keywords =. doi:10.1051/0004-6361:20021220 , archivePrefix =. astro-ph/0209331 , primaryClass =

arXiv
[219]

, keywords =

A single model for the variety of multiple-population formation(s) in globular clusters: a temporal sequence. , keywords =. doi:10.1093/mnras/stw387 , archivePrefix =. 1602.05412 , primaryClass =

arXiv
[220]

, keywords =

Multiple stellar population mass loss in massive Galactic globular clusters. , keywords =. doi:10.1051/0004-6361/202347268 , archivePrefix =. 2309.15161 , primaryClass =

arXiv
[221]

Evolution of two stellar populations in globular clusters. II. Effects of primordial gas expulsion. , keywords =. doi:10.1051/0004-6361/200913703 , archivePrefix =. 1003.5921 , primaryClass =

arXiv
[222]

, keywords =

Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters. , keywords =. doi:10.1051/0004-6361:20066013 , archivePrefix =. astro-ph/0611379 , primaryClass =

arXiv
[223]

, keywords =

Rapid Temporal Variability of Faculae: High-Resolution Observations and Modeling. , keywords =. doi:10.1086/505074 , adsurl =

doi
[224]

, keywords =

Formation and dynamical evolution of multiple stellar generations in globular clusters. , keywords =. doi:10.1111/j.1365-2966.2008.13915.x , archivePrefix =. 0809.1438 , primaryClass =

2008
[226]

, keywords =

Massive binaries as the source of abundance anomalies in globular clusters. , keywords =. doi:10.1051/0004-6361/200913205 , archivePrefix =. 0910.1086 , primaryClass =

arXiv
[227]

, keywords =

On a physical mechanism for extra mixing in globular cluster red giants. , keywords =. doi:10.1046/j.1365-8711.2000.03498.x , adsurl =

2000
[228]

, keywords =

Supermassive stars as a source of abundance anomalies of proton-capture elements in globular clusters. , keywords =. doi:10.1093/mnrasl/slt133 , archivePrefix =. 1305.5975 , primaryClass =

arXiv
[229]

Constraints on the Distance Moduli, Helium, and Metal Abundances, and Ages of Globular Clusters from Their RR Lyrae and Non-variable Horizontal Branch Stars. II. Multiple Stellar Populations in 47 Tuc, M3, and M13. , keywords =. doi:10.3847/1538-4357/aa92c9 , archivePrefix =. ...

arXiv
[230]

, keywords =

Evidence from stellar abundances for a large age difference between two globular clusters. , keywords =. doi:10.1038/351212a0 , adsurl =

doi
[231]

, keywords =

Solar H excess during Solar Cycle 24 from full-disk filtergrams of the Chromospheric Telescope. , keywords =. doi:10.1051/0004-6361/202040091 , archivePrefix =. 2203.04357 , primaryClass =

arXiv
[232]

, keywords =

The Evolution of Magnetic Activity on V711 Tauri and Evidence for a Significant Facular Contribution. , keywords =. doi:10.1086/168278 , adsurl =

doi
[233]

, keywords =

Lithium and Proton-capture Elements in Globular Cluster Dwarfs: The Case of 47 TUC. , keywords =. doi:10.1088/2041-8205/713/1/L1 , archivePrefix =. 1003.0013 , primaryClass =

arXiv
[234]

, keywords =

A decade of solar high-fidelity spectroscopy and precise radial velocities from HARPS-N. , keywords =. doi:10.1051/0004-6361/202557132 , archivePrefix =. 2510.27635 , primaryClass =
[235]

, keywords =

HARPS-N Observes the Sun as a Star. , keywords =. doi:10.1088/2041-8205/814/2/L21 , archivePrefix =. 1511.02267 , primaryClass =

arXiv
[236]

, keywords =

Three years of HARPS-N high-resolution spectroscopy and precise radial velocity data for the Sun. , keywords =. doi:10.1051/0004-6361/202039350 , archivePrefix =. 2009.01945 , primaryClass =

2009 arXiv
[237]

, keywords =

The Solar Filigree. , keywords =. doi:10.1007/BF00152419 , adsurl =

doi
[238]

, keywords =

The Mount Wilson Observatory S-index of the Sun. , keywords =. doi:10.3847/1538-4357/835/1/25 , archivePrefix =. 1611.04540 , primaryClass =

arXiv
[239]

, keywords =

Globular Cluster Formation at High Density: A Model for Elemental Enrichment with Fast Recycling of Massive-star Debris. , keywords =. doi:10.3847/1538-4357/836/1/80 , archivePrefix =. 1701.01034 , primaryClass =

arXiv
[240]

Atmospheric Chemistry & Physics , keywords =

Recent variability of the solar spectral irradiance and its impact on climate modelling. Atmospheric Chemistry & Physics , keywords =. doi:10.5194/acp-13-3945-201310.5194/acpd-12-24557-2012 , archivePrefix =. 1303.5577 , primaryClass =

2012 arXiv
[241]

Living Reviews in Solar Physics , keywords =

Magnetic Fields in the Solar Convection Zone. Living Reviews in Solar Physics , keywords =. doi:10.12942/lrsp-2009-4 , adsurl =

2009 doi
[242]

, keywords =

Solar gravitational energy and luminosity variations. , keywords =. doi:10.1016/j.newast.2007.05.003 , archivePrefix =. 0909.0194 , primaryClass =

2007 arXiv
[243]

, keywords =

Self-consistent Magnetic Stellar Evolution Models of the Detached, Solar-type Eclipsing Binary EF Aquarii. , keywords =. doi:10.1088/0004-637X/761/1/30 , archivePrefix =. 1210.6177 , primaryClass =

arXiv
[244]

Nature Communications , keywords =

Fast rotating blue stragglers prefer loose clusters. Nature Communications , keywords =. doi:10.1038/s41467-023-38153-w , archivePrefix =. 2305.08478 , primaryClass =

arXiv
[245]

Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO). I. An updated census of APOGEE N-rich giants across the Milky Way. , keywords =. doi:10.1051/0004-6361/202243195 , archivePrefix =. 2204.09702 , primaryClass =

arXiv
[246]

, keywords =

Concurrent formation of supermassive stars and globular clusters: implications for early self-enrichment. , keywords =. doi:10.1093/mnras/sty1059 , archivePrefix =. 1804.04682 , primaryClass =

arXiv
[247]

, keywords =

Relation of Chromospheric Activity to Convection, Rotation, and Pre--Main-Sequence Evolution. , keywords =. doi:10.1086/163807 , adsurl =

doi
[248]

, keywords =

A Lack of Planets in 47 Tucanae from a Hubble Space Telescope Search. , keywords =. doi:10.1086/317334 , adsurl =

doi
[249]

, keywords =

A Kepler study of starspot lifetimes with respect to light-curve amplitude and spectral type. , keywords =. doi:10.1093/mnras/stx1931 , archivePrefix =. 1707.08583 , primaryClass =

arXiv
[250]

, keywords =

Excitation of Solar p-Modes. , keywords =. doi:10.1086/173904 , adsurl =

doi
[251]

Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity. , keywords =. doi:10.1051/0004-6361/202039765 , archivePrefix =. 2012.10199 , primaryClass =

2012
[252]

, keywords =

Emergence of Internetwork Magnetic Fields through the Solar Atmosphere. , keywords =. doi:10.3847/1538-4357/abe7e0 , archivePrefix =. 2103.02213 , primaryClass =

arXiv
[253]

, keywords =

The O-Na and Mg-Al anticorrelations in turn-off and early subgiants in globular clusters. , keywords =. doi:10.1051/0004-6361:20010144 , archivePrefix =. astro-ph/0012457 , primaryClass =

arXiv
[254]

, year = 2004, month = sep, volume =

Abundance Variations Within Globular Clusters. , year = 2004, month = sep, volume =. doi:10.1146/annurev.astro.42.053102.133945 , adsurl =

2004
[255]

, keywords =

The second and third parameters of the horizontal branch in globular clusters. , keywords =. doi:10.1051/0004-6361/200912572 , archivePrefix =. 1004.3862 , primaryClass =

arXiv
[256]

The Na-O anticorrelation in horizontal branch stars. I. NGC 2808. , keywords =. doi:10.1051/0004-6361/201117690 , archivePrefix =. 1109.4013 , primaryClass =

arXiv
[257]

The Na-O anticorrelation in horizontal branch stars. II. NGC 1851. , keywords =. doi:10.1051/0004-6361/201118491 , archivePrefix =. 1201.1772 , primaryClass =

arXiv
[258]

The Na-O anticorrelation in horizontal branch stars. III. 47 Tucanae and M 5. , keywords =. doi:10.1051/0004-6361/201219976 , archivePrefix =. 1210.4069 , primaryClass =

arXiv
[259]

The Na-O anticorrelation in horizontal branch stars. IV. M 22. , keywords =. doi:10.1051/0004-6361/201323101 , archivePrefix =. 1401.7109 , primaryClass =

arXiv
[260]

The Na-O anticorrelation in horizontal branch stars. V. NGC 6723. , keywords =. doi:10.1051/0004-6361/201424393 , archivePrefix =. 1410.8378 , primaryClass =

arXiv
[261]

, keywords =

What is a globular cluster? An observational perspective. , keywords =. doi:10.1007/s00159-019-0119-3 , archivePrefix =. 1911.02835 , primaryClass =

1911 arXiv
[262]

, keywords =

Hot Horizontal-Branch Stars: The Ubiquitous Nature of the ``Jump'' in Str \"o mgren u, Low Gravities, and the Role of Radiative Levitation of Metals. , keywords =. doi:10.1086/307807 , archivePrefix =. astro-ph/9903120 , primaryClass =

arXiv
[263]

Nature Astronomy , keywords =

Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs. Nature Astronomy , keywords =. doi:10.1038/s41550-021-01335-x , archivePrefix =. 2104.10919 , primaryClass =

arXiv
[264]

, keywords =

The Presence of Two Distinct Red Giant Branches in the Globular Cluster NGC 1851. , keywords =. doi:10.1088/0004-637X/707/2/L190 , archivePrefix =. 0911.5356 , primaryClass =

arXiv
[265]

, keywords =

Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES ^ +. , keywords =. doi:10.1051/0004-6361/202346314 , archivePrefix =. 2305.06873 , primaryClass =

arXiv
[266]

, keywords =

Spectral Diagnostics of Solar Photospheric Bright Points. , keywords =. doi:10.3847/1538-4357/aba692 , archivePrefix =. 2007.09675 , primaryClass =

2007 arXiv
[267]

, keywords =

CN Abundance Variations on the Main Sequence of 47 Tucanae. , keywords =. doi:10.1086/345570 , archivePrefix =. astro-ph/0210364 , primaryClass =

arXiv
[268]

Research in Astronomy and Astrophysics , keywords =

Observation of solar coronal heating powered by magneto-acoustic oscillations in a moss region. Research in Astronomy and Astrophysics , keywords =. doi:10.1088/1674-4527/21/4/105 , archivePrefix =. 2010.06787 , primaryClass =

2010 arXiv
[269]

Kepler Flares. I. Active and Inactive M Dwarfs. , keywords =. doi:10.1088/0004-637X/797/2/121 , archivePrefix =. 1410.7779 , primaryClass =

arXiv
[270]

, keywords =

The Sun as a planet-host star: proxies from SDO images for HARPS radial-velocity variations. , keywords =. doi:10.1093/mnras/stw187 , archivePrefix =. 1601.05651 , primaryClass =

arXiv
[271]

, keywords =

A Survey of Ca II H and K Chromospheric Emission in Southern Solar-Type Stars. , keywords =. doi:10.1086/117796 , adsurl =

doi
[272]

, keywords =

Nearly Century-scale Variation of the Sun's Radius. , keywords =. doi:10.3847/1538-4357/ab6d08 , archivePrefix =. 2003.08676 , primaryClass =

2003 arXiv
[273]

, keywords =

Photospheric magnetic structure of coronal holes. , keywords =. doi:10.1051/0004-6361/201935918 , archivePrefix =. 1909.03806 , primaryClass =

1909 arXiv
[274]

Research in Astronomy and Astrophysics , year = 2017, month = feb, volume =

Location of energy source for coronal heating on the photosphere. Research in Astronomy and Astrophysics , year = 2017, month = feb, volume =. doi:10.1088/1674-4527/17/3/25 , adsurl =

2017 doi
[275]

, keywords =

The contribution of N-rich stars to the Galactic stellar halo using APOGEE red giants. , keywords =. doi:10.1093/mnras/staa3598 , archivePrefix =. 2008.01097 , primaryClass =

2008 arXiv
[276]

, keywords =

Integrated mass-loss of evolved stars in M4 using asteroseismology. , keywords =. doi:10.1093/mnras/stac1918 , archivePrefix =. 2207.02406 , primaryClass =

arXiv
[277]

, keywords =

Star-to-Star Abundance Variations among Bright Giants in the Mildly Metal-poor Globular Cluster M4. , keywords =. doi:10.1086/301017 , archivePrefix =. astro-ph/9905370 , primaryClass =

arXiv
[278]

, keywords =

Structure and dynamics of isolated internetwork Ca II H bright points observed by SUNRISE. , keywords =. doi:10.1051/0004-6361/201220089 , archivePrefix =. 1211.4836 , primaryClass =

arXiv
[279]

Research in Astronomy and Astrophysics , keywords =

Magneto-acoustic oscillations observed in a solar plage region. Research in Astronomy and Astrophysics , keywords =. doi:10.1088/1674-4527/21/7/179 , archivePrefix =. 2101.11998 , primaryClass =

arXiv
[280]

, keywords =

Oxygen and Sodium Abundances in M13 (NGC 6205) Giants: Linking Globular Cluster Formation Scenarios, Deep Mixing, and Post-RGB Evolution. , keywords =. doi:10.1088/2041-8205/754/2/L38 , archivePrefix =. 1207.1919 , primaryClass =

1919 arXiv
[281]

, keywords =

A blue depression in the optical spectra of M dwarfs. , keywords =. doi:10.1093/mnras/stad1391 , archivePrefix =. 2304.09219 , primaryClass =

arXiv
[282]

, keywords =

APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South. , keywords =. doi:10.3847/1538-3881/aba592 , archivePrefix =. 2007.05537 , primaryClass =

2007 arXiv
[283]

, keywords =

The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars. , keywords =. doi:10.1017/pasa.2014.21 , archivePrefix =. 1405.0062 , primaryClass =

2014 arXiv
[284]

, keywords =

Temporal variations in the acoustic signal from faculae. , keywords =. doi:10.1111/j.1365-2966.2012.20542.x , archivePrefix =. 1201.2539 , primaryClass =

2012
[285]

, keywords =

Observations of Intensity Fluctuations Attributed to Granulation and Faculae on Sun-like Stars from the Kepler Mission. , keywords =. doi:10.1088/0004-637X/767/1/34 , archivePrefix =. 1302.5563 , primaryClass =

arXiv
[286]

, keywords =

The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity. , keywords =. doi:10.3847/1538-4357/aaa026 , archivePrefix =. 1711.07716 , primaryClass =

arXiv
[287]

, keywords =

Resolution of magnetic flux tubes on the Sun. , keywords =. doi:10.1038/359307a0 , adsurl =

doi
[288]

, keywords =

On the Origin of Solar Faculae. , keywords =. doi:10.1086/421553 , adsurl =

doi
[289]

, keywords =

Tracking magnetic bright point motions through the solar atmosphere. , keywords =. doi:10.1093/mnras/sts268 , archivePrefix =. 1210.5904 , primaryClass =

arXiv
[290]

, keywords =

The Theoretical Calculation of the Rossby Number and the ``Nonlocal'' Convective Overturn Time for Pre-Main-Sequence and Early Post-Main-Sequence Stars. , keywords =. doi:10.1086/176733 , adsurl =

doi
[291]

Journal of Korean Astronomical Society , keywords =

Diverse Chemo-Dynamical Properties of Nitrogen-Rich Stars Identified from Low-Resolution Spectra. Journal of Korean Astronomical Society , keywords =. doi:10.5303/JKAS.2023.56.1.59 , archivePrefix =. 2305.04025 , primaryClass =

2023 arXiv
[292]

, keywords =

The Magnetic Field of the Active Planet-hosting M Dwarf AU Mic. , keywords =. doi:10.3847/1538-4357/abb2a2 , archivePrefix =. 2008.10668 , primaryClass =

2008 arXiv
[293]

Journal of Space Weather and Space Climate , keywords =

Magnitudes and timescales of total solar irradiance variability. Journal of Space Weather and Space Climate , keywords =. doi:10.1051/swsc/2016025 , archivePrefix =. 1606.05258 , primaryClass =
[294]

The non-dynamo regime

On the dynamical interaction between overshooting convection and an underlying dipole magnetic field - I. The non-dynamo regime. , keywords =. doi:10.1093/mnras/stab477 , archivePrefix =. 2008.01857 , primaryClass =

2008 arXiv
[295]

, keywords =

On the nonhomogeneity of metal abundances in stars of globular clusters and satellite subsystems of the Galaxy. , keywords =. doi:10.1146/annurev.aa.17.090179.001521 , adsurl =
[296]

Evolutionary Scenarios

Abundance Differences among Globular Cluster Giants: Primordial vs. Evolutionary Scenarios. , keywords =. doi:10.1086/133416 , adsurl =

doi
[297]

, keywords =

Proton Capture Chains in Globular Cluster Stars.II.Oxygen, Sodium, Magnesium, and Aluminum Abundances in M13 Giants Brighter Than the Horizontal Branch. , keywords =. doi:10.1086/118251 , adsurl =

doi
[298]

, keywords =

Revealing Probable Universal Features in the Lower Red Giant Branch Luminosity Functions of Galactic Globular Clusters. , keywords =. doi:10.1088/0004-6256/137/6/5110 , adsurl =

doi
[299]

, keywords =

Nitrogen Abundances and Multiple Stellar Populations in the Globular Clusters of the Fornax dSph. , keywords =. doi:10.1088/0004-637X/797/1/15 , archivePrefix =. 1409.0541 , primaryClass =

arXiv
[300]

, keywords =

Radial Distributions of Sub-Populations in the Globular Cluster M15: A More Centrally Concentrated Primordial Population. , keywords =. doi:10.1088/0004-637X/804/1/71 , archivePrefix =. 1503.00726 , primaryClass =

arXiv

Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.

[1] [1]

Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars. , year = 1967, month = nov, volume =. doi:10.1086/149359 , adsurl =

doi:10.1086/149359 1967

[2] [2]

, keywords =

Expanding the Time Domain of Multiple Populations: Evidence of Nitrogen Variations in the 1.5 Gyr Old Star Cluster NGC 1783. , keywords =. doi:10.3847/2041-8213/ac424a , archivePrefix =. 2112.06964 , primaryClass =

arXiv

[3] [3]

, keywords =

Relative Frequencies of Blue Stragglers in Galactic Globular Clusters: Constraints for the Formation Mechanisms. , keywords =. doi:10.1086/383617 , archivePrefix =. astro-ph/0402592 , primaryClass =

arXiv

[4] [4]

, keywords =

The Gaia-ESO Survey: No sign of multiple stellar populations in open clusters from their sodium and oxygen abundances. , keywords =. doi:10.1051/0004-6361/202245144 , archivePrefix =. 2406.07022 , primaryClass =

arXiv

[5] [5]

, keywords =

Globular cluster chemistry in fast-rotating dwarf stars belonging to intermediate-age open clusters. , keywords =. doi:10.1051/0004-6361/201732351 , archivePrefix =. 1802.06654 , primaryClass =

arXiv

[6] [6]

Sodium abundance variations within the 2-Gyr-old cluster NGC 1978

Leveraging HST with MUSE - I. Sodium abundance variations within the 2-Gyr-old cluster NGC 1978. , keywords =. doi:10.1093/mnras/staa2748 , archivePrefix =. 2009.03320 , primaryClass =

arXiv 1978

[7] [7]

, keywords =

On the Nitrogen variation in 2 Gyr old massive star clusters in the large Magellanic Cloud. , keywords =. doi:10.1093/mnras/stab1590 , archivePrefix =. 2106.02054 , primaryClass =

arXiv

[8] [8]

, keywords =

Age as a major factor in the onset of multiple populations in stellar clusters. , keywords =. doi:10.1093/mnras/stx2556 , archivePrefix =. 1710.00831 , primaryClass =

arXiv