期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 332, 期 1, 页码 59-64出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2002.05276.x
关键词
stars : formation; HII regions; cosmology : theory; early Universe
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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