The present state of knowledge of the binary system HDE226868 = Cygnus X-1 is summarized, including system dimensions, nature of the secondary X-ray source, and mass transfer properties. Some deficiencies in the optical observations are pointed out; these deficiencies make interpretation of the system difficult, but can be corrected.
Optical observations of HDE 226868 = Cygnus X-1: A review
1976-01-01
Conference paper
No indication
English
The long term variability of HDE 226868 = Cygnus X-1
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