The 1980 June X-ray high state of Cygnus X-1 - Optical changes
J. C. KempOregon, University, Eugene, OreM. S. BarbourOregon, University, Eugene, OreR. E. McBirneyOregon, University, Eugene, Ore
1981en
ABI
Abstract
UBV photometry of Cygnus X-1 is reported from before, during, and after the 1980 June X-ray high state discovered by the Hakucho satellite. A darkening was recorded around orbital phase 0.25, also near phase 0.0, which persisted for over a month after the X-ray episode. The brightness around phase 0.75 remained normal. Light curves from preceding years are compared. Preliminary mention is also made of polarization changes during the high state.
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