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New results from long-term observations of Cygnus X-1 (1976)

Holt, S. S. ; Serlemitsos, P. J. ; Boldt, E. A. ; [et al.]

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Publication Date: 2011-08-16

Description: 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.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal; 203; Jan. 15

Format: text

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