An upper limit on the mass of a primordial star due to the formation of an H ii region: the effect of ionizing radiation force |
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| Authors: | Kazuyuki Omukai Shu-ichiro Inutsuka |
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| Institution: | Division of Theoretical Astrophysics, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy; Department of Physics, Kyoto University, Kyoto 606-8502, Japan |
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| Abstract: | We investigate analytically the formation of an H ii region in the accreting envelope of a newborn star. Special care is taken to examine the role of ionizing radiation force. This effect modifies velocity and density distributions, and thereby affects the expansion of the H ii region. As a result, the upper limit of the stellar mass imposed by the growth of an H ii region around a forming star is increased by a larger factor than the previous estimate. In particular, for a star forming out of metal-free gas, this mechanism does not impose a firm upper limit on its mass. |
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| Keywords: | stars: formation H ii regions cosmology: theory early Universe |
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