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        Galactic chemical evolution : Carbon through zinc

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        Author
        Kobayashi, C.
        Umeda, Hideyuki
        Nomoto, Ken'ichi
        Tominaga, Nozomu
        Ohkubo, Takuya
        Attention
        2299/13659
        Abstract
        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.
        Publication date
        2006-12-20
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.1086/508914
        Other links
        http://hdl.handle.net/2299/13659
        Relations
        School of Physics, Engineering & Computer Science
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