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Determining the wind parameters for massive stars and ultraluminous
x-ray sources using model grids of extended atmospheres
In order to obtain mass estimates of the parameters of winds in massive
stars and ultraluminous x-ray sources (ULX), the CMFGEN code was used
to compute grids of non-LTE extended model atmospheres. The resulting
equivalent width diagrams plotted for selected emission lines were used
to determine the photosphere temperature and matter outflow rates in the
winds of several LBV and Of/late-WN type stars in our Galaxy and M31.
A comparison of the derived quantities with the results of detailed
computations by other authors showed an agreement within 2% for the
temperature and 20% for the gas outflow rates. For the first time,
ULX wind parameters were obtained: the values are in the 33000-36000 K
interval and (1.1-7.6)×10-5
solar masses per year. The observed equivalent
widths of the lines were measured as a result of object spectroscopy
carried out with the 6-meter telescope of SAO RAS as well as large foreign telescopes.
Authors:
Kostenkov A.E., Vinokurov A.S., Solovyeva Y.N. (SAO RAS), Fabrika S.
(SAO RAS, KFU) in cooperation with Atapin K. (SAI MSU)
Published:
1. A. Kostenkov, A. Vinokurov, Y. Solovyeva, K. Atapin, S. Fabrika; «Modeling of
Extended Atmospheres with Temperatures below 40 000 K»;
Astrophysical Bulletin, Volume 75, No 2, pp. 207-217 (2020)
2. A. Kostenkov, A. Vinokurov, Y. Solovyeva; "Determining parameters of
ULXs with model grids of extended atmospheres"; Ground-Based Astronomy
in Russia. 21st Century, Proceedings of the All-Russian Conference held
21-25 September, 2020 in Nizhny Arkhyz, Russia. Edited by
I.I. Romanyuk, I.A. Yakunin, A.F. Valeev, D.O. Kudryavtsev, 2020, p. 242-243
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