Evidence for an approx. 300 day period in Cygnus X-1
Journal Article
·
· Astrophys. J.; (United States)
We present the time history of X-ray emission from Cyg X-1 over an 11 year period, with 10 day resolution. The data were obtained by experiments on the Vela 5B (1969--1979) and Ariel 5 (1974--1980) satellites. Cyg X-1 varies by approx.25% with a 294 +- 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 observed period is within the possible range for the precession period of an accretion disk, or of the companion star HDE 226868, in the Cyg X-1 system.
- Research Organization:
- Earth and Space Sciences Division, Los Alamos National Laboratory
- OSTI ID:
- 5471693
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 270:1; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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