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We calculate the evolution of heavy element abundances from C to Zn in the solar neighborhood adopting our new nucleosynthesis yields. Our yields are calculated for wide ranges of metallicity (Z=0-Z_\) and the explosion energy (normal supernovae and hypernovae), based on the light curve and spectra fitting of individual supernovae. The elemental abundance ratios are in good agreement with observations. Among the alpha-elements, O, Mg, Si, S, and Ca show a plateau at Fe/H < -1, while Ti is underabundant overall. The observed abundance of Zn (Zn/Fe ~ 0) can be explained only by the high energy explosion models, which requires a large contribution of hypernovae. The observed decrease in the odd-Z elements (Na, Al, and Cu) toward low Fe/H is reproduced by the metallicity effect on nucleosynthesis. The iron-peak elements (Cr, Mn, Co, and Ni) are consistent with the observed mean values at -2. 5 < Fe/H < -1, and the observed trend at the lower metallicity can be explained by the energy effect. We also show the abundance ratios and the metallicity distribution functions of the Galactic bulge, halo, and thick disk. Our results suggest that the formation timescale of the thick disk is ~ 1-3 Gyr.
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Chiaki Kobayashi
University of Hertfordshire
Hideyuki Umeda
Tokyo Institute of Technology
K. Nomoto
Florida State University
The Astrophysical Journal
CERN Bulletin
The University of Tokyo
Tokyo University of Science
National Astronomical Observatory of Japan
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Kobayashi et al. (Wed,) studied this question.
synapsesocial.com/papers/69d8ca53ce048d2571bee2f8 — DOI: https://doi.org/10.1086/508914
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