Asymmetric Shapes of Radio Recombination Lines from Ionized Stellar Winds. (arXiv:1811.02024v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Ignace_R/0/1/0/all/0/1">R Ignace</a>
Recombination line profile shapes are derived for ionized spherical stellar
winds at radio wavelengths. It is assumed that the wind is optically thick
owing to free-free opacity. Emission lines of arbitrary optical depth are
obtained assuming that the free-free photosphere forms in the outer, constant
expansion portion of the wind. Previous works have derived analytic results for
isothermal winds when the line and continuum source functions are equal. Here,
semi-analytic results are derived for when the source functions are not equal
to reveal that line shapes can be asymmetric about line center. A parameter
study is presented and applications discussed.
Recombination line profile shapes are derived for ionized spherical stellar
winds at radio wavelengths. It is assumed that the wind is optically thick
owing to free-free opacity. Emission lines of arbitrary optical depth are
obtained assuming that the free-free photosphere forms in the outer, constant
expansion portion of the wind. Previous works have derived analytic results for
isothermal winds when the line and continuum source functions are equal. Here,
semi-analytic results are derived for when the source functions are not equal
to reveal that line shapes can be asymmetric about line center. A parameter
study is presented and applications discussed.
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