期刊
ASTROPHYSICAL JOURNAL
卷 692, 期 2, 页码 1517-1531出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/692/2/1517
关键词
nuclear reactions, nucleosynthesis, abundances; supernovae: general
资金
- MEXT of Japan [19840010]
- Grants-in-Aid for Scientific Research [19840010] Funding Source: KAKEN
There have been attempts to fit the abundance patterns of extremely metal-poor (EMP) stars with supernova (SN) nucleosynthesis models for the elements lighter than Zn. Observations have revealed the presence of EMP stars with a peculiarly high ratio of weak r-process elements Sr, Y, and Zr. Although several possible processes were suggested for the origin of these elements, a complete solution for reproducing those ratios has not yet been found. In order to reproduce the abundance patterns of such stars, we investigate a model with neutron-rich matter ejection from the inner region of the conventional mass-cut. We find that explosive nucleosynthesis in a high energy SN (or hypernova) can reproduce the high abundances of Sr, Y, and Zr but that the enhancements of Sr, Y, and Zr are not achieved by nucleosynthesis in a normal SN. Our results imply that, if these elements are ejected from a normal SN, nucleosynthesis in higher entropy flow than that of the SN shock is required.
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