The Isotopic Abundances of Magnesium in Stars | Zendy

Pamela Gay | Zendy; David L. Lambert | Zendy

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The Isotopic Abundances of Magnesium in Stars

Author(s) -

Pamela Gay,

David L. Lambert

Publication year - 2000

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 - 10.1086/308653

Subject(s) - stars , astrophysics , metallicity , physics , asymptotic giant branch , isotope , natural abundance , abundance (ecology) , isotopes of magnesium , giant star , spectral line , astronomy , biology , nuclear physics , fishery

Isotopic abundance ratios 24^Mg:25^Mg:26^Mg are derived for 20 stars fromhigh- resolution spectra of the MgH A-X 0-0 band at 5140AA. With the exceptionof the weak g-band giant HR 1299, the stars are dwarfs that sample themetallicity range -1.8 < [Fe/H] <0.0. The abundance of 25^Mg amd 26^Mg relativeto the dominant isotope 24^Mg decreases with decreasing [Fe/H] in fair accordwith predictions from a recent model of galactic chemical evolution in whichthe Mg isotopes are synthesised by massive stars. Several stars appearespecially enriched in the heavier Mg isotopes suggesting contamination bymaterial from the envelopes of intermediate-mass AGB stars.Comment: 18 pages, 9 figures, 1 table. ApJ, accepte

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