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

Details The 1980 June X-ray high state of Cygnus X-1 - Optical changes The 1980 June X-ray high state of Cygnus X-1 - Optical changes

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l..73k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Mar. 1, 1981, p. L73-L77. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

11

Astronomical Photometry, Light Curve, Ubv Spectra, X Ray Sources, Polarized Radiation, X Ray Stars

Scientific paper

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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