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Magnesium Isotopes in Metal-Poor Dwarfs, the Rise of AGB Stars and the Formation Timescale of the Galactic Halo

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arxiv astro-ph/0702655 v1 pith:XON35QGA submitted 2007-02-24 astro-ph

Jorge Melendez (RSAA , Australia) , Judith G. Cohen (Caltech , USA) This is my paper · ORCID
classification astro-ph
keywords halocontributiondwarfsgalactichighmagnesiummetal-poormetallicities
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We have determined magnesium isotopic ratios (^{25,26}Mg/Mg) in metal-poor (-2.6 [Fe/H] -1.3) halo dwarfs employing high S/N (90-280) high spectral resolution (R = 10^5) Keck HIRES spectra. Unlike previous claims of an important contribution from intermediate-mass AGB stars at low metallicities, we find that the rise of the AGB contribution in the Galactic halo did not occur until intermediate metallicities ([Fe/H] ~> -1.5).

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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. Magnesium isotope ratios in Milky Way and dwarf galaxy stars

    astro-ph.GA 2026-07 conditional novelty 7.0 of 10

    Magnesium isotope ratios in Milky Way and accreted dwarf galaxy stars trace a single universal enrichment track when plotted against [Mg/H], despite differences at fixed [Fe/H].

  2. The complex stellar system M 22: constraining the chemical enrichment from AGB stars using magnesium isotope ratios

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

    First Mg isotope measurements at [Fe/H]≈-2 in a globular cluster show no difference tied to s-process enrichment, favoring ~2.75 M_sun AGB polluters and a 280–480 Myr age gap.

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