Gemini/GNIRS infrared spectroscopy of the Wolf–Rayet stellar wind in Cygnus X-3

  title={Gemini/GNIRS infrared spectroscopy of the Wolf–Rayet stellar wind in Cygnus X-3},
  author={Karri I. I. Koljonen and Thomas J. Maccarone},
  journal={Monthly Notices of the Royal Astronomical Society},
The microquasar Cygnus X-3 was observed several times with the Gemini North Infrared Spectrograph while the source was in the hard X-ray state. We describe the observed 1.0-2.4 $\mu$m spectra as arising from the stellar wind of the companion star and suggest its classification as a WN 4-6 Wolf-Rayet star. We attribute the orbital variations of the emission line profiles to the variations in the ionization structure of the stellar wind caused by the intense X-ray emission from the compact object… 

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