The optical light curve of Cygnus X-1

Details The optical light curve of Cygnus X-1 The optical light curve of Cygnus X-1

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..511l&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 511-514 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

2

Black Holes (Astronomy), Cygnus Constellation, Light Curve, Spectrum Analysis, X Ray Binaries, Periodic Variations, Photometry, Stellar Orbits, Stellar Spectra, X Ray Astronomy

Scientific paper

An analysis of the optical light curve of the massive X ray binary and black hole candidate Cygnus X-1 is presented. It is based on broad band UBV photometry covering the period 1972 to 1985. The principal photometric variation has a period of 5.59982 + or - 0.00005 days and is sensibly the same as the orbital period. The existence of a second period in the optical variations at 294.3 + or - 0.5 is confirmed. The shape of the binary 5.6 day light curve in U, B and V is clearly shown to be a function of phase in the 294 day period, with most of the activity restricted to phases -0.25 to 0.25 of the 5.6 day cycle. The minimum at phase 0.5 of the 5.6 day cycle is essentially constant throughout the 294 day cycle. A search for period changes in the 5.6 day cycle shows no conclusive evidence of change.

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