X-rays from Wolf-Rayet Stars

Details X-rays from Wolf-Rayet Stars X-rays from Wolf-Rayet Stars

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.3308i&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #33.08; Bulletin of the American Astronomical Society, Vol. 34, p.1156

Astronomy and Astrophysics

Astronomy

Scientific paper

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.)

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