TY - JOUR
T1 - Galactic chemical evolution
T2 - Carbon through zinc
AU - Kobayashi, C.
AU - Umeda, Hideyuki
AU - Nomoto, Ken'ichi
AU - Tominaga, Nozomu
AU - Ohkubo, Takuya
N1 - Copyright © 2006. The American Astronomical Society. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1086/508914
PY - 2006/12/20
Y1 - 2006/12/20
N2 - 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 circle dot) 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] similar to 0) can be explained only by the high-energy explosion models, as it 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 less than or similar to [Fe/H] less than or similar to -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 similar to 1-3 Gyr.
AB - 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 circle dot) 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] similar to 0) can be explained only by the high-energy explosion models, as it 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 less than or similar to [Fe/H] less than or similar to -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 similar to 1-3 Gyr.
KW - galaxies : abundances
KW - galaxies : evolution
KW - supernovae : general
KW - METAL-POOR STARS
KW - METALLICITY DISTRIBUTION FUNCTION
KW - DETAILED ABUNDANCE ANALYSIS
KW - DWARF SPHEROIDAL GALAXIES
KW - CORE-COLLAPSE SUPERNOVAE
KW - GAMMA-RAY BURST
KW - 25 APRIL 1998
KW - IA SUPERNOVAE
KW - SOLAR NEIGHBORHOOD
KW - SULFUR ABUNDANCES
U2 - 10.1086/508914
DO - 10.1086/508914
M3 - Article
SN - 0004-637X
VL - 653
SP - 1145
EP - 1171
JO - The Astrophysical Journal
JF - The Astrophysical Journal
IS - 2
ER -