期刊
ASTROPHYSICAL JOURNAL
卷 660, 期 1, 页码 747-761出版社
IOP PUBLISHING LTD
DOI: 10.1086/512601
关键词
nuclear reactions, nucleosynthesis, abundances; stars : abundances; stars : individual (BS 16934-002); stars : Population II; supernovae : general
资金
- STFC [PP/D000920/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D000920/1] Funding Source: researchfish
detailed elemental abundance analysis has been carried out for the very metal-poor (Fe/H = -2.7)star BS 16934-002, 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 HD 122563 indicates excesses of O, Na, Mg, Al, and Sc in BS 16934 002. Of particular interest, no excess of C or N is found in this object, in contrast to CS 22949-037 and CS 29498-043, 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 BS 16934-002. A supernova model, including mixing and fallback and assuming severe mass loss before explosion, is discussed as a candidate progenitor of BS 16934-002.
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