Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-31
Astrophys.J.692:1517-1531,2009
Astronomy and Astrophysics
Astrophysics
27pages, 15figures; ApJ accepted
Scientific paper
10.1088/0004-637X/692/2/1517
There have been attempts to fit the abundance patterns of extremely metal-poor stars with supernova nucleosynthesis models for the lighter elements than Zn. On the other hand, observations have revealed that the presence of EMP stars with peculiarly high ratio of "weak r-process elements" Sr, Y and Zr. Although several possible processes were suggested for the origin of these elements, the complete solution for reproducing those ratios is not found yet. 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 supernova (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 supernova. Our results imply that, if these elements are ejected from a normal supernova, nucleosynthesis in higher entropy flow than that of the supernova shock is required.
Izutani Natsuko
Tominaga Nozomu
Umeda Hideyuki
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