AAS 201st Meeting, January, 2003
Session 33. Stars Dead or Alive
Oral, Monday, January 6, 2003, 2:00-3:30pm, 606-607

[Previous] | [Session 33] | [Next]

[33.08] X-rays from Wolf-Rayet Stars

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

[Previous] | [Session 33] | [Next]

Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.