Microquasar. Black hole component. Gamma Ray emitter.
2
GCVS Team
Cyg X-1. SB1. The epoch of the inferior conjunction of the optical component is given in the Table. Min II 8.88. The shape of the light curve varies; Min II sometimes are not observed. The periodicity in the light curve variations as well as in polarization changes is possible with P = 78.4d [J.C.Kemp, L.C.Herman, M.S.Barbour, AJ 83, 962-970, 1978., E.A.Karitskaya, Astron. Tsirk. N1088, 1979.]. Rapidly variable X-ray source in wide range up to 3 MeV characterized by the change of high and low states. Light and X-ray variation with P = 294d is also detected [R.K.Manchanda, ApSS 91, N2, 455, 1983., J.C.Kemp, IAU Circ N3780, 1983.]. Variable and flare radio source at 2695 and 8085 MHz.
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