Formation of stars at very low metallicities

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

The thermal evolution of low metallicity gas during the protostellar collapse is described. By using this result, the fragmentation mass scale is evaluated. Particular attention is paid to the critical metallicity where transition from very massive to low-mass star formation occurs. For this transition, metals must be in a form of dust. Its cooling enables low-mass fragmentataion for metallicity higher than [M/H]=-6 - 51. However, there is a pocket in the metallicity range -5≲[M/H]≲-4 where the low-mass fragmentation is prohibited by sudden heat injection due to three-body H2 formation. This may explain observed scarcity of ultra metal-poor stars in this metallicity range, as well as a clear cutoff at metallicity of [M/H]≃-4, provided that the dust is already present in such low metallicity environments.

本文言語English
ホスト出版物のタイトルFirst Stars III
ページ63-67
ページ数5
DOI
出版ステータスPublished - 2008 4 28
外部発表はい
イベントFirst Stars III - Santa Fe, NM, United States
継続期間: 2007 7 152007 7 20

出版物シリーズ

名前AIP Conference Proceedings
990
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

OtherFirst Stars III
国/地域United States
CitySanta Fe, NM
Period07/7/1507/7/20

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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