AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 104. Stellar Atmospheres and Variability
Oral, Thursday, June 3, 1999, 2:00-3:30pm, Marquette

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[104.05] Jet and wind environment of Cyg X-3

R.N. Ogley (SAp, CEA-Saclay), S.J. Bell Burnell (The Open University / Princeton University), R.P. Fender (University of Amsterdam), G.G. Pooley (Cambridge University), E.B. Waltman (Naval Research Laboratory), M. van der Klis (University of Amsterdam)

We present new infrared and sub-mm spectra over a range of activity states, for the unusual X-ray binary Cygnus X-3.

A multi-wavelength campaign from radio (GBI, Ryle), sub-mm (JCMT SCUBA), infrared (ISO, UKIRT) and X-ray (XTE PCA) wavelengths in quiescent, semi-active and flaring states is presented. From radio through the sub-mm the emission is dominated by synchrotron radiation; absence of spectral ageing of the electrons limits the magnetic field in the jets to < 7 T at 800 solar radii.

The infrared spectrum in a quiescent state is dominated by thermal free-free emission from the Wolf-Rayet wind. However, the infrared spectra during outbursts is flatter than the wind model would allow, indicating a synchrotron component is observed during a flare.

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