Open AccessAn upper limit on the mass of a primordial star due to the formation of an H ii region: the effect of ionizing radiation force
Author(s) -
Omukai Kazuyuki,
Inutsuka Shuichiro
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05276.x
Subject(s) - physics , astrophysics , star (game theory) , limit (mathematics) , eddington luminosity , envelope (radar) , star formation , ionizing radiation , radiation , stellar mass , stars , astronomy , irradiation , luminosity , optics , nuclear physics , galaxy , mathematical analysis , telecommunications , radar , mathematics , computer science
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.