Evidence for an about 300 day period in Cygnus X-1

Details Evidence for an about 300 day period in Cygnus X-1 Evidence for an about 300 day period in Cygnus X-1

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..233p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 233-238. Research sponsored by the U.S. Department of

Astronomy and Astrophysics

Astrophysics

104

Binary Stars, Variable Stars, X Ray Sources, X Ray Stars, Accretion Disks, Precession, Supergiant Stars, Time Series Analysis

Scientific paper

Results from 10 years of observation of Cyg X-1 by the Vela 5B satellite are reported. Good evidence for an approximately 300 day period is found, which is confirmed by independent data from the All-Sky Monitor instrument on Ariel 5. Cyg X-1 varies by about 25 percent with a 294 + or -4 day period. This modulation is apparently unrelated to the known transitions between the source high and low states. Flux minima occur at 1974.05+nP. The 294 day period is consistent with the precession of the supergiant companion HDE 226868 and also with the precession period of a tilted accretion disk. The light curve could be modulated by a change in the mass transfer rate or variable obscuration by ionized matter.

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