NASA NTRS · 19760059617
Optical study of the X-ray binary Hercules X-1
Abstract
The 1.7 day B-V light curve of HZ Herculis shows the existence of a small hot component which is present only during the X-ray active portion of the 35-day cycle. This hot component is associated with the X-ray source since it is absent during X-ray eclipse.
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Saint John, R. H.. 1976-08-15. Optical study of the X-ray binary Hercules X-1. https://ntrs.nasa.gov/citations/19760059617
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