Browsing University of Hertfordshire by Author "Ishigaki, Miho N."

Now showing items 1-4 of 4

    • 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. ...

    • 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 ...

    • 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, ...

    • Origin of metals in old Milky Way halo stars based on GALAH and Gaia 

      Ishigaki, Miho N.; Hartwig, Tilman; Tarumi, Yuta; Leung, Shing-Chi; Tominaga, Nozomu; Kobayashi, Chiaki; Magg, Mattis; Simionescu, Aurora; Nomoto, Ken'ichi (2021-10-01)
      Stellar and supernova nucleosynthesis in the first few billion years of the cosmic history have set the scene for early structure formation in the Universe, while little is known about their nature. Making use of stellar ...