Modeling of orbital modulation of Cygnus X-3 by particle simulations

Details Modeling of orbital modulation of Cygnus X-3 by particle simulations Modeling of orbital modulation of Cygnus X-3 by particle simulations

2007-05-11

arxiv.org/abs/0705.1639v1

Astronomy and Astrophysics

Astrophysics

4 pages (pdf), proceedings of the 6th INTEGRAL Workshop 'The Obscured Universe', July 2-8 2006, ESA SP-622

Scientific paper

The formation of the circumbinary envelope of Cygnus X-3 was studied by particle simulations of the WR (Wolf Rayet) companion wind. Light curves resulting from electron scattering absorption in this envelope were computed and compared with observed IBIS/ISGRI and BATSE light curves. The matching was relatively good. For reasonable values of binary parameters (masses, inclination) and wind velocities, a stable envelope was formed during a few binary orbits. Assuming approximately 10^-6 solar mass/year for the rate of the WR-wind, the observed light curves and accretion luminosity can be re-produced (assuming Thomson scattering opacity in the ionized He-rich envelope). The illuminated envelope can also model the CHANDRA-spectrum using the photoionizing XSTAR-code. Furthermore, we discuss observed radial velocity curves of IR emission lines in the context of simulated velocity fields and find good agreement.

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