NASA NTRS · 19720045747
Optical candidates for two X-ray sources.
Abstract
Suggestion of the bright stars X Per and HD 77581 as possible candidates for the X-ray sources 2U 0352+30 and 2U 0900-40 respectively. The first is an active, rapidly rotating Be star which is losing mass. The second is similar to BD+34.3815 deg, a likely candidate for Cyg X-1, in spectral type and in the possibility that it may be a short-period binary.
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Brucato, R. J., Kristian, J.. 1972-05-01. Optical candidates for two X-ray sources.. https://ntrs.nasa.gov/citations/19720045747
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