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2012MNRAS.421.2820O - Mon. Not. R. Astron. Soc., 421, 2820-2831 (2012/April-3)
Clumped stellar winds in supergiant high-mass X-ray binaries: X-ray variability and photoionization.
OSKINOVA L.M., FELDMEIER A. and KRETSCHMAR P.
Abstract (from CDS):
We study the absorption of X-rays in the clumped stellar wind by means of a two-dimensional stochastic wind model. The monochromatic absorption in the cool stellar wind, depending on the orbital phase, is computed for realistic stellar wind opacity. We find that the absorption of X-rays changes strongly at different orbital phases. The degree of the variability resulting from the absorption in the wind depends on the shape of the wind clumps, and this is stronger for oblate clumps.
We address the photoionization in the clumped wind, and we show that the degree of ionization is affected by the wind clumping. We derive a correction factor for the photoionization parameter, and we show that the photoionization parameter is reduced by a factor χ compared to the smooth wind models with the same mass-loss rate, where χ is the wind inhomogeneity parameter. We conclude that wind clumping must also be taken into account when comparing the observed and model spectra of the photoionized stellar wind.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): accretion, accretion discs - instabilities - stars: neutron - X-rays: binaries - X-rays: stars
Simbad objects: 6
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