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R. Ignace (U of Wisconsin), L. M. Oskinova (University of Potsdam), A. M. T. Pollock (ESA/Vilspa), J. C. Brown (University of Glasgow), W.-R. Hamann (University of Potsdam)
We describe observations of several apparently single Wolf-Rayet stars that have now been observed with the XMM-Newton instrument. Prior to this, the X-ray data of Wolf-Rayet stars consisted primarily of ROSAT passband detections (many of which were marginal). Data for the nitrogen-rich stars WR 6 (EZ CMa; HD50896) and WR 110 have been described by Skinner etal, who unexpectedly found a hard component in the spectra. We report on a third WN star, WR 1, which also shows the hint of a hard tail. In our program we also observed the carbon-rich star WR 114. Even after 19000 seconds of integration, we were unable to detect this star, which places a 1-sigma upper limit to the ratio of X-ray to Bolometric luminosity of 10-8.4, about 25 times smaller than typical O stars.
(This research has been supported by NASA grant NAG5-12557.)
The author(s) of this abstract have provided an email address for comments about the abstract: ignace@astro.wisc.edu
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.