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Prog. Theor. Phys. Supplement No.151 (2003) pp. 44-53

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Nucleosynthesis in Black-Hole-Forming Supernovae and Extremely Metal-Poor Stars

Ken'ichi Nomoto,1,* Keiichi Maeda,1 Hideyuki Umeda,1 Takuya Ohkubo,1 Jinsong Deng1 and Paolo Mazzali2

1Department of Astronomy, University of Tokyo, Tokyo 113-0033, Japan
2Osservatorio Astronomico, Via Tiepolo, 11, 34131 Trieste, Italy

(Received March 15, 2003)

Abstract:

Stars more massive than ∼ 20 - 25 M⊙ form a black hole at the end of their evolution. Stars with non-rotating black holes are likely to collapse “quietly" ejecting a small amount of heavy elements (Faint supernovae). In contrast, stars with rotating black holes are likely to give rise to very energetic supernovae (Hypernovae). We present distinct nucleosynthesis features of these two types of “black-hole-forming" supernovae. Nucleosynthesis in Hypernovae are characterized by larger abundance ratios (Zn,Co,V,Ti)/Fe and smaller (Mn,Cr)/Fe, which can explain the observed trend of these ratios in extremely metal-poor stars. Nucleosynthesis in Faint supernovae is characterized by a large amount of fall-back. We show that the abundance pattern of the recently discovered most Fe deficient star, HE0107-5240, and other extremely metal-poor carbon-rich stars are in good accord with those of black-hole-forming supernovae, but not pair-instability supernovae. This suggests that black-hole-forming supernovae made important contributions to the early Galactic (and cosmic) chemical evolution. Finally we discuss the nature of First (Pop III) Stars.


URL : http://ptp.ipap.jp/link?PTPS/151/44/
DOI : 10.1143/PTPS.151.44


*E-mail: nomoto@astron.s.u-tokyo.ac.jp

[ Full Text PDF : FREE ACCESS (284K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Supplement No.151 (2003) pp. 211-215 :
    Jets and Black Holes in Hypernova Explosions
    Keiichi Maeda and Ken'ichi Nomoto

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