New results from long-term observations of Cygnus X-1

Details New results from long-term observations of Cygnus X-1 New results from long-term observations of Cygnus X-1

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203l..63h&link_type=abstract

Astrophysical Journal, vol. 203, Jan. 15, 1976, pt. 2, p. L63-L66.

Astronomy and Astrophysics

Astronomy

30

Binary Stars, Black Holes (Astronomy), X Ray Sources, X Ray Stars, Crab Nebula, Statistical Distributions, X Ray Astronomy

Scientific paper

Observations of Cyg X-1 between October 1974 and July 1975 reveal a persistent 5.6-day modulation of the 3-6 keV X-ray intensity, having a minimum in phase with superior conjunction of the HDE 226868 binary system. The modulation is found to be most pronounced just prior to the April-May 1975 increase of Cyg X-1, after which both the modulation and intensity are at their lowest values for the entire duration of the observations. These data imply that the X-ray emission from Cyg X-1 arises from the compact member of HDE 226868, and that the increase of April-May 1975 may have represented the depletion of accreting material which had not yet been mixed into a cylindrically symmetric accretion disk about the compact member.

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