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Optical Flares of Cygnus X-1

Published online by Cambridge University Press:  25 May 2016

N.G. Bochkarev ,
E.A. Karitskaya  and
V.M. Lyuty
N.G. Bochkarev
Affiliation:
Sternberg Astronomical Institute, Moscow, 119899, Russia Institute of Astronomy, Pyatnitskaya st., 48, Moscow, Russia
E.A. Karitskaya
Affiliation:
Sternberg Astronomical Institute, Moscow, 119899, Russia Institute of Astronomy, Pyatnitskaya st., 48, Moscow, Russia
V.M. Lyuty
Affiliation:
Sternberg Astronomical Institute, Moscow, 119899, Russia Institute of Astronomy, Pyatnitskaya st., 48, Moscow, Russia

Extract

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Photoelectric observations of Cyg X-1 in 1996-97 fulfilled in Tien-Shan, Kazakhstan (WBVR), Mt. Maidanak, Uzbekistan (UBVR) and in Crimea, Ukraine (UBV) have detected unusual optical flare activity. During May-August 1996 Cyg X-1 was in high soft X-ray state and after August 9, 1996 it returned to its ordinary state but with some evidences of X-ray activity.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 384 - 385
Copyright
Copyright © Kluwer 1998 

References

Karitskaya, E.A., Goranskij, V.P. and Grankin, K.N. (1997) Properties of Optical Brightness Variations of Cyg X-1 in 1995–1996 Including X-ray Hard and Soft States, JENAM-97 , Thessaloniki, Greece; (in preparation to Pisma v Astron. Zh.) Google Scholar
Kemp, J. (1980) On the Allowed Size of an Accretion Disk in Cygnus X-1, Astrophysical Journal , 235 pp. 595–602 Google Scholar