The precession angle of the optical component of the Cygnus X-1 system

Details The precession angle of the optical component of the Cygnus X-1 system The precession angle of the optical component of the Cygnus X-1 system

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..410s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, June 1984, p. 410-416) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, May-June

Astronomy and Astrophysics

Astronomy

2

Astrometry, Binary Stars, Stellar Rotation, Variable Stars, X Ray Sources, Precession, Stellar Gravitation, Ubv Spectra

Scientific paper

The hypothesis that the rotation axis of the optical star in an X-ray binary system will precess is tested. Possible effects arising directly from the precession of the orbit of the supergiant HDE 226868 in the Cygnus X-1 system are investigated. The variable gravity-darkening contribution to the light-curve amplitude of the star is estimated. It is found that the scatter in the v sin i measurements of the system would be compatible with the amplitude of the long-term U-band variation if the precession angle is greater than about eight degrees.

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