On the possibility of optical eclipse in the Cygnus X-1 system

Details On the possibility of optical eclipse in the Cygnus X-1 system On the possibility of optical eclipse in the Cygnus X-1 system

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sval....7..336b&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, Oct. 1981, p. 605-611.) Soviet Astronomy Letters, vol. 7, Sept.-Oct. 1981, p. 336-33

Astronomy and Astrophysics

Astronomy

14

Black Holes (Astronomy), Eclipsing Binary Stars, Light Curve, Stellar Mass Accretion, Stellar Models, Ubv Spectra, X Ray Sources, Roche Limit, Stellar Occultation

Scientific paper

The inverse problem of interpreting high-precision mean light curves of Cygnus X-1 is solved for a model in which a relativistic object is surrounded by an accretion disk. The light curve of the system is synthesized by the summation of the contributions of small elements of the optical star and the disk, and the inverse problem is then solved for models with and without accretion disks based on values of the U, B and V light curve observed to within errors of 0.007, 0.003 and 0.005 magnitudes, respectively. Calculated light curves for the models with and without a disk are found to differ insignificantly. For a most probable distance to the system of 2.0 kpc, ranges for system parameters are derived corresponding to an inclination between 30 and 61 deg, mass ratio between 0.61 and 0.28, degree of Roche lobe filling between 1.0 and 0.87, X-ray component mass between 12.4 and 7.5 solar masses, and optical component mass between 20.3 and 26.8 solar masses. The optical variability of the system is attributed to the effect of ellipsoidality in the optical star.

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