Three-color photometry of HDE 226868 - The optical counterpart of Cygnus X-1

Details Three-color photometry of HDE 226868 - The optical counterpart of Cygnus X-1 Three-color photometry of HDE 226868 - The optical counterpart of Cygnus X-1

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205..855l&link_type=abstract

Astrophysical Journal, vol. 205, May 1, 1976, pt. 1, p. 855-860.

Astronomy and Astrophysics

Astrophysics

15

Binary Stars, Light Curve, Stellar Spectrophotometry, Ubv Spectra, X Ray Stars, Amplitudes, Error Analysis, Phase Deviation, X Ray Sources

Scientific paper

Results of UBV photoelectric observations of HDE 226868 (Cyg X-1) obtained on fifty nights during 1974 are presented. These observations show a light curve with the following characteristics: (1) two unequal light maxima and minima during the 5.6-day orbital period which exhibit a peak-to-peak magnitude change of about 0.07 mag in all colors; (2) a small phase-dependent color variation which results in a reddening in both color indices of about 0.003 mag at times of light minima; (3) erratic light variability on a general time scale of days with an amplitude of plus or minus 0.01 to 0.02 mag and no apparent color dependence.

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