Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-06
Astrophys.J.660:747-761,2007
Astronomy and Astrophysics
Astrophysics
34 pages, 4 tables, 7 figures, Astrophysical Jounal, in press
Scientific paper
10.1086/512601
A detailed elemental abundance analysis has been carried out for the very metal-poor ([Fe/H]=-2.7) star BS16934-002, which was identified in our previous work as a star exhibiting large overabundances of Mg and Sc. A comparison of the abundance pattern of this star with that of the well-studied metal-poor star HD122563 indicates excesses of O, Na, Mg, Al, and Sc in BS16934-002. Of particular interest, no excess of C or N is found in this object, in contrast to CS22949-037 and CS29498-043, two previously known carbon-rich, extremely metal-poor stars with excesses of the alpha elements. No established nucleosynthesis model exists that explains the observed abundance pattern of BS16934-002. A supernova model, including mixing and fallback, assuming severe mass loss before explosion, is discussed as a candidate progenitor of BS16934-002.
Aoki Wako
Beers Timothy C.
Honda Satoshi
Iwamoto Nobuyuki
Nomoto Ken'ichi
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