Cygnus X-1 - Optical variation on the 294 day X-ray period

Details Cygnus X-1 - Optical variation on the 294 day X-ray period Cygnus X-1 - Optical variation on the 294 day X-ray period

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271l..65k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. L65-L68. Research sponsored

Astronomy and Astrophysics

Astrophysics

38

Binary Stars, Cygnus Constellation, Light Curve, Ubv Spectra, X Ray Sources, Orbital Elements, Polarization Characteristics

Scientific paper

The recently discovered 294 day X-ray period has optical counterparts. A 10 yr B band photometric record shows synchronous changes of 0.01 mag amplitude, with minima coinciding with the X-ray minima. Stronger and weaker variations, respectively, are seen in U and V. The 5.6 day orbital light curves, additionally, show pronounced changes on the 294 day cycle. There is also a 294 day polarization variation.

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