Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..731l&link_type=abstract
(Astronomicheskii Zhurnal, vol. 62, July-Aug. 1985, p. 731-739) Soviet Astronomy (ISSN 0038-5301), vol. 29, July-Aug. 1985, p. 4
Astronomy and Astrophysics
Astronomy
8
Eclipsing Binary Stars, Light Curve, Precession, X Ray Binaries, Ellipsoids, Stellar Orbits, Ubv Spectra
Scientific paper
The results of UBV observations of the binary system V 1357 Cyg, associated with the X-ray source Cyg X-1, from 1975-1982 are presented. The results of an analysis of both the orbital and the long-period variability of the object are reported. A more precise value of the photometric period, P = 5.60004 d + or - 0.00005 d, is derived. The mean light curve, which coincides with the theoretical curve of the ellipsoidality effect to within 0.3 percent, has an average amplitude of 0.044 m + or - 0.002 m and a difference between minima of 0.002 m + or - 0.002 m. An excess high-temperature emission at the time of superior conjunction of the X-ray source is discovered. The luminosity of the source is about one percent of the luminosity of the system in the V filter, while the temperature exceeds the temperature of an O 9.7 supergiant. The X-ray period of 294 days is absent in the optical range.
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