Infrared spectroscopic variability of Cygnus X-3 in outburst and quiescence

  title={Infrared spectroscopic variability of Cygnus X-3 in outburst and quiescence},
  author={Robert P. Fender and M.M.Hanson and Guy G. Pooley},
  journal={Monthly Notices of the Royal Astronomical Society},
ABSTRA C T We present four epochs of high-resolution infrared spectroscopy of the peculiar X-ray binary Cygnus X-3. The observations cover quiescent, small-flaring and outburst states of the system as defined by radio and X-ray monitoring. The underlying infrared spectrum of the source, as observed during radio and X-ray quiescence and small-flaring states, is one of broad, weak He ii and N v emission. Spectral variability in this state is dominated by modulation at the 4.8-h orbital period of… 

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