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Radiative Feedback from Primordial Protostars and Final Mass of the First StarsIn this contribution, we review our efforts toward understanding the typical mass-scale of primordial stars. Our direct numerical simulations show that, in both of Population III.1 and III.2 cases, strong UV stellar radiative feedback terminatesmass accretion onto a protostar.AnHII region formed around the protostar very dynamically expands throughout the gas accreting envelope, which cuts off the gas supply to a circumstellar disk. The disk is exposed to the stellar UV radiation and loses its mass by photoevaporation. The derived final masses are 43 Stellar Mass and 17 Stellar Mass in our fiducial Population III.1 and III.2 cases. Much more massive stars should form in other exceptional conditions. In atomic-cooling halos where H2 molecules are dissociated, for instance, a protostar grows via very rapid mass accretion with the rates M* approx. 0.1 - 1 Stellar Mass/yr. Our newstellar evolution calculations show that the protostar significantly inflates and never contracts to reach the ZAMS stage in this case. Such the "supergiant protostars" have very low UV luminosity, which results in weak radiative feedback against the accretion flow. In the early universe, supermassive stars formed through this process might provide massive seeds of supermassive black holes.
Document ID
20150005634
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Hosokawa, Takashi
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Omukai, Kazuyuki
(Kyoto Univ. Japan)
Yoshida, Naoki
(Tokyo Univ. Kashiwa, Japan)
Yorke, Harold W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
April 13, 2015
Publication Date
May 21, 2012
Subject Category
Astrophysics
Meeting Information
Meeting: FIRST STARS IV - From Hayashi to the Future
Location: Kyoto
Country: Japan
Start Date: May 21, 2012
End Date: May 25, 2012
Sponsors: Japan Society for the Promotion of Science, Kyoto Univ., Tokyo Univ., Tsukuba Univ.
Distribution Limits
Public
Copyright
Other
Keywords
star formation
early universe
cosmology

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