Now showing items 1-6 of 6

    • Chemical enrichment in the carbon-enhanced damped Ly α system by population III supernovae 

      Kobayashi, Chiaki; Tominaga, Nozomu; Nomoto, Ken'ichi (2011-04-01)
      We show that the recently observed elemental abundance pattern of the carbon-rich metal-poor damped Ly alpha (DLA) system is in excellent agreement with the nucleosynthesis yields of faint core-collapse supernovae of ...
    • Faint Population III supernovae as the origin of the most iron-poor stars 

      Ishigaki, Miho N.; Tominaga, Nozomu; Kobayashi, Chiaki; Nomoto, Ken'ichi (2014-08-26)
      The most iron-deficient stars in the Milky Way provide important observational constraints on the nature of astrophysical objects that have enriched the primordial gas with heavy elements from which these stars were formed. ...
    • Galactic chemical evolution : Carbon through zinc 

      Kobayashi, C.; Umeda, Hideyuki; Nomoto, Ken'ichi; Tominaga, Nozomu; Ohkubo, Takuya (2006-12-20)
      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 ...
    • The Initial mass function of the first stars inferred from extremely metal-poor stars 

      Ishigaki, Miho N.; Tominaga, Nozomu; Kobayashi, Chiaki; Nomoto, Ken'ichi (2018-04-11)
      We compare the elemental abundance patterns of ~200 extremely metal-poor (EMP; [Fe/H] < −3) stars to the supernova yields of metal-free stars, in order to obtain insights into the characteristic masses of the first (Population ...
    • Nucleosynthesis yields of core-collapse supernovae and hypernovae, and galactic chemical evolution 

      Nomoto, Ken'ichi; Tominaga, Nozomu; Umeda, Hideyuki; Kobayashi, C.; Maeda, Keiichi (2006-10-17)
      We present new nucleosynthesis yields as functions of the stellar mass, metallicity, and explosion energy (corresponding to normal supernovae and hypernovae). We apply the results to the chemical evolution of the solar ...
    • The origin of low [alpha/Fe] ratios in extremely metal-poor stars 

      Kobayashi, Chiaki; Ishigaki, Miho N.; Tominaga, Nozomu; Nomoto, Ken'ichi (2014-03-25)
      We show that the low ratios of $\alpha$ elements (Mg, Si, and Ca) to Fe recently found for a small fraction of extremely metal-poor stars can be naturally explained with the nucleosynthesis yields of core-collapse supernovae, ...