Modeling of extended atmospheres with temperatures below 40000K

Abstract

We calculate models of extended stellar atmospheres with a temperature in the range of 12000-40000K and a mass loss rate of $10^{-6}-10^{-4}{M}_{\odot }$ yr${}^{-1}$. A large number of objects with emission spectra, such as luminous blue variables (LBV), FeII - emission line stars, Of/late-WN stars, and even ultraluminous X-ray sources (ULXs) often have effective temperatures in this range. The paper presents the results of model grids calculating in the form of equivalent width diagrams for the selected lines of hydrogen, He, Si, and Fe, as well as the results of studies of some emission objects using the calculated models.

arXiv comment10 pages, 5 figures, accepted for publication in Astrophysical Bulletin: Vol. 75, No. 1, 2020

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