Identification of Cygnus X-1 with HDE 226868

@article{Bolton1972IdentificationOC,
  title={Identification of Cygnus X-1 with HDE 226868},
  author={C. Bolton},
  journal={Nature},
  year={1972},
  volume={235},
  pages={271-273}
}
  • C. Bolton
  • Published 1972
  • Physics
  • Nature
  • 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 scale of days in a way that suggests it is being eclipsed. Therefore I decided to take photographic spectra of HDE 226868 to look for velocity… CONTINUE READING
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