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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

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

Jorge Melendez (RSAA , Australia) , Judith G. Cohen (Caltech , USA) This is my paper
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.

  1. Magnesium isotope ratios in Milky Way and dwarf galaxy stars

    astro-ph.GA 2026-07 conditional novelty 7.0

    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

    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.