Physics – Nuclear Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nupha.718..277n&link_type=abstract
Nuclear Physics A, Volume 718, p. 277-286.
Physics
Nuclear Physics
10
Scientific paper
Hypernovae are the core-collapse supernovae with very large explosion energies (>~ 1052 ergs). Nucleosynthesis in hypernovae show the following characteristics: 1) Higher energy explosions tend to produce larger [(Zn, Co, V)/Fe] and smaller [(Mn, Cr)/Fe], which can explain the trend observed in very metal-poor stars. 2) Because of enhanced α-rich freezeout, 44Ca, 48Ti, and 64Zn are produced more abundantly than in normal supernovae. The large [(Ti, Zn)/Fe]ratios observed in very metal-poor stars strongly suggest a significant contribution of hypernovae. 3) Oxygen burning takes place in more extended regions in hypernovae, which makes the Si/O ratio larger. We thus suggest that hypernovae make important contribution to the early Galactic (and cosmic) chemical evolution.
We then discuss the evolutionary origin of the recently discovered most Fe deficient star, HE0107-5240. We show that the abundance pattern of HE0107-5240 and other extremely metal-poor (EMP) stars are in good accord with those of supernovae which originate from ~ 20-130 Msolar stars and form ~ 3-10 Msolar black holes.
Deng Jing-song
Maeda Kei--ichi
Mazzali Paolo
Nomoto Ken'ichi
Ohkubo Takuya
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