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10 November 2024
 
  » arxiv » astro-ph/0701159

 Article overview



Spectroscopic Studies of Extremely Metal-Poor Stars with the Subaru High Dispersion Spectrograph. IV. The alpha-Element-Enhanced Metal-Poor Star BS16934-002
Wako Aoki ; Satoshi Honda ; Timothy C. Beers ; Masahide Takada-Hidai ; Nobuyuki Iwamoto ; Nozomu Tominaga ; Hideyuki Umeda ; Ken’ichi Nomoto ; John E. Norris ; Sean G. Ryan ;
Date 6 Jan 2007
AbstractA 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.
Source arXiv, astro-ph/0701159
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