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- Title
Dependence of the Absorption-Line Profiles and Radial-Velocity Curve of the Optical Star in an X-ray Binary on the Orbital Inclination and Component-Mass Ratio.
- Authors
Abubekerov, M. K.; Antokhina, É. A.; Cherepashchuk, A. M.
- Abstract
Theoretical absorption-line profiles and radial-velocity curves for tidally deformed optical stars in X-ray binary systems are calculated assuming LTE. The variations in the profile shapes and radial-velocity curve of the optical star are analyzed as a function of the orbital inclination of the X-ray binary system. The dependence of the shape of the radial-velocity curve on the orbital inclination i increases with decreasing component-mass ratio q = mx/mv. The integrated line profiles and radial-velocity curves of the optical star are calculated for the Cyg X-1 binary, which are then used to estimate the orbital inclination and mass of the relativistic object: i < 43º and mx = 8.2 – 12.8 M⊙. These estimates are in good agreement with earlier results of fitting the radial-velocity curve of Cyg X-1 using a simpler model (i < 45 º, mx = 9.0 – 13.2 M ⊙).© 2005 Pleiades Publishing, Inc.
- Subjects
X-ray binaries; BINARY stars; BINARY number system; A stars; RADIAL velocity of stars; STARS; X-ray astronomy; MATHEMATICS
- Publication
Astronomy Reports, 2005, Vol 49, Issue 10, p801
- ISSN
1063-7729
- Publication type
Article
- DOI
10.1134/1.2085250