A Low-mass Primary for Cygnus X-1?
Open Access
- 1 May 1973
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 162 (1) , 1P-3P
- https://doi.org/10.1093/mnras/162.1.1p
Abstract
If the primary of HDE 226868 (Cyg X-1) is a low mass (0.3–0.5 M⊙ ), low surface gravity B star of the type of which the primary of HZ 22 is the prototype, then the secondary falls well within the mass range of stable neutron stars (and white dwarfs), and need not be a black hole.Keywords
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