Other
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..847...65u&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Hori
Other
Abundances, Chemical Composition, Population Ii Stars, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments
Scientific paper
The recent discovery of a hyper metal-poor (HMP: -5 <~ [Fe/H] <~ -4) star have raised a challenging question if these HMP stars are first generation stars in the Universe. We argue that these HMP stars are the second generation stars being formed from gases which were chemically enriched by the first generation supernovae. The key to this solution is the very unusual abundance patterns of these HMP stars with important similarities and differences. We can reproduce these abundance features with the core-collapse ``faint'' supernova models which undergo extensive matter mixing and fallback during the explosion (mixing-fallback model). We also show that the abundance patterns of extremely metal-poor (EMP: -4 <~ [Fe/H] <~ -3) stars are well-reproduced by a 25 Msolar hypernova mixing-fallback model and those of very metal-poor (VMP: -3 <~ [Fe/H] <~ -2) stars are well-reproduced by a model integrated by Salpeter's initial mass function over 13 - 50 Msolar models.
Iwamoto Nobuyuki
Maeda Kengo
Nomoto Ken
Tominaga Nozomu
Umeda Hideyuki
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