Formation environment of Pop II stars affected by the feedbacks from Pop III stars

G. Chiaki, H. Susa, S. Hirano

研究成果: Conference article査読

1 被引用数 (Scopus)


Stars with metallicities [Fe/H] <-3 are called extremely metal-poor (EMP) stars, and considered to be formed in clouds enriched with metal from a single or several supernovae (SNe) of the first-generation (Pop III) stars. To confirm this, we numerically follow the enrichment process of minihalos (MHs) which have hosted Pop III stars. During their main-sequence (MS), the ionizing photons can not or partly break the gas around the Pop III stars because the halo binding energy is marginally larger than the radiation energy. After SN explosions, the gas continues to accrete along filaments of the large-scale structures, and the gas collapses again in the MHs within ∼ 10 Myr for low-mass MHs (3 × 105 M) while ∼ 1 Myr for massive MHs (3 × 106 M). The metallicity in the recollapsing regions is 10-4-10-2 Z and 10-6-10-5 Z⊙, respectively. This indicates that EMP stars are formed in the clouds enriched by a single SN in low-mass MHs.

ジャーナルMemorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society
出版ステータスPublished - 2017
イベント2017 Conference Francesco's Legacy: Star Formation in Space and Time - Firenze, Italy
継続期間: 2017 6月 52017 6月 9

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 放射線学、核医学およびイメージング
  • 天文学と天体物理学
  • 器械工学
  • 原子分子物理学および光学


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