Identification of Cygnus X-1 with HDE 226868

@article{BOLTON1972IdentificationOC,
  title={Identification of Cygnus X-1 with HDE 226868},
  author={C. T. BOLTON},
  journal={Nature},
  year={1972},
  volume={235},
  pages={271-273}
}
THE ninth magnitude BOIb star HDE 226868 is closely coincident with the position of Cygnus X-1 and its associated variable radio source1. Dolan2 has pointed out that Cyg X-1 appears to be a two component X-ray source. One component has a synchrotron spectrum, and the other has a thermal (or bremsstrahlung) spectrum. The latter component varies on a time… CONTINUE READING