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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 | Abstract: | 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. | Source: | arXiv, astro-ph/0701159 | Services: | Forum | Review | PDF | Favorites |
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