Estimate of the Black-Hole Mass and Orbital Inclination from the Radial-Velocity Curve of the X-Ray Binary Cyg X-1

Details Estimate of the Black-Hole Mass and Orbital Inclination from the Radial-Velocity Curve of the X-Ray Binary Cyg X-1 Estimate of the Black-Hole Mass and Orbital Inclination from the Radial-Velocity Curve of the X-Ray Binary Cyg X-1

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48..550a&link_type=abstract

Astronomy Reports, vol. 48, Issue 7, p.550-562

Astronomy and Astrophysics

Astronomy

8

Scientific paper

The results of a statistical approach to interpreting a master radial-velocity curve for the X-ray binary Cyg X-1 are presented. The dependence of the mass of the X-ray component m x on the mass of the optical component m v is obtained in a Roche model. A method for estimating the orbital inclination from the radial-velocity curve is described. In contrast to the situation for a pointlike optical star, both the amplitude and shape of the radial-velocity curve changes as a function of the orbital inclination i in the case of a tidally deformed star with a complex temperature distribution over its surface. Thus, high-accuracy radial-velocity curves can be used to impose constraints on the mass and orbital inclination of the black hole: i<45°. Using the information on the optical light curve, radius, and luminosity of the optical star, we estimate 31°

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