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The Araucaria Project. The Distance to the Sculptor dwarf spheroidal galaxy from infrared photometry of RR Lyrae stars

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arxiv 0804.0347 v1 pith:Q2EB6MMW submitted 2008-04-02 astro-ph

G. Pietrzynski , W. Gieren , O. Szewczyk , A. Walker , L. Rizzi , F. Bresolin , R.-P. Kudritzki , K. Nalewajko
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J. Storm M. Dall'Ora V. Ivanov
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abstract

We have obtained single-phase near-infrared magnitudes in the J and K bands for a sample of 78 RR Lyrae stars in the Sculptor dSph galaxy. Applying different theoretical and empirical calibrations of the period-luminosity-metallicity relation for RR Lyrae stars in the infrared, we find consistent results and obtain a true, reddening-corrected distance modulus of 19.67 $\pm$ 0.02 (statistical) $\pm$ 0.12 (systematic) mag for Sculptor from our data. This distance value is consistent with the value of 19.68 $\pm$ 0.08 mag which we obtain from earlier V-band data of RR Lyrae stars in Sculptor, and the V magnitude-metallicity calibration of Sandage (1993). It is also in a very good agreement with the results obtain by Rizzi (2002) based on tip of the red giant branch (TRGB, 19.64 $\pm$ 0.08 mag) and horizontal branch (HB, 19.66 $\pm$ 0.15 mag).

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Improving reddening estimates for RR Lyrae stars in the Gaia bands: a machine learning approach to the PAC(Z) relation

    astro-ph.SR 2026-07 conditional novelty 6.0 of 10

    New SFS-based linear relations predict Gaia intrinsic colors of RRab and RRc RR Lyrae from period, amplitude, and metallicity, yielding reddening and AG estimates that are cross-checked on clusters and dwarf galaxies.

  2. Dwarf galaxies in non-local gravity

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

    Non-local gravity can fit the velocity dispersions of eight dwarf spheroidals without dark matter, but its scale parameter is poorly constrained and two galaxies show tension with earlier rotation-curve results.

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