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The 1980 June X-ray high state of Cygnus X-1 - Optical changes (1981)

Kemp, J. C. ; Barbour, M. S. ; Mcbirney, R. E.

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Publication Date: 2011-08-18

Description: 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.

Keywords: ASTRONOMY

Type: Astrophysical Journal; vol. 244

Format: text

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