Magnesium Isotopes in Metal-poor Dwarfs: The Rise of AGB Stars and the Formation Timescale of the Galactic Halo | Zendy

J. Meléndez | Zendy; Judith G. Cohen | Zendy

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Magnesium Isotopes in Metal-poor Dwarfs: The Rise of AGB Stars and the Formation Timescale of the Galactic Halo

Author(s) -

J. Meléndez,

Judith G. Cohen

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/516735

Subject(s) - physics , astrophysics , halo , galactic halo , stars , nucleosynthesis , isotope , spectral line , astronomy , asymptotic giant branch , galaxy , nuclear physics

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 spectralresolution (R = 10^5) Keck HIRES spectra. Unlike previous claims of animportant contribution from intermediate-mass AGB stars at low metallicities,we find that the rise of the AGB contribution in the Galactic halo did notoccur until intermediate metallicities ([Fe/H] ~> -1.5).Comment: ApJ Letters, in pres

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