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K. Nomoto, H. Umeda, K. Maeda, T. Ohkubo, N. Tominaga (U of Tokyo)
Recent observations of abundance patterns in extremely metal-poor (EMP) stars are providing us with critical information on nucleosynthesis in Population (Pop) III supernovae (SNe) and thus on the nature of the first stars in the Universe. We have calculated nucleosynthesis in various types of Pop III SNe, which includes core-collapse (black-hole-forming) SNe of 20-130 Msun stars, and pair instability SNe (PISNe) of 130-300 Msun stars. We find that the yields of hyper-energetic core-collapse SNe (Hypernovae) can explain the observed trends in the abundance ratios among iron-peak elements (Mn, Co, Ni, Zn)/Fe as well as the large C/Fe ratio observed in certain EMP stars. In contrast, the yields of PISNe do not fit to the observed abundance patters of EMP stars. Asphericity in the explosions strengthens the nucleosynthesis properties of hypernovae. Abundance patters in star-burst galaxies are also discussed. We suggest that black-hole-forming hypernovae make important contribution to the cosmic chemical evolution at high z and low Z.
The author(s) of this abstract have provided an email address for comments about the abstract: nomoto@astron.s.u-tokyo.ac.jp
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Bulletin of the American Astronomical Society, 36 #2
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