XMM-Newton X-Ray Observations of the Unusual Wolf-Rayet Star WR 66
Abstract
We summarize results of an XMM-Newton X-ray observation of the WN8h-type Wolf-Rayet star WR 66 which shows unusual 3.5-4.1 hr optical variations. One possible explanation is a compact companion (cc) which, if present, could give rise to luminous X-ray emission. WR 66 was marginally detected and its inferred X-ray luminosity (Lx) is orders of magnitude below that expected from wind accretion onto a neutron star, but is comparable to that of the WN8h stars WR 16 and WR 124. If luminous X-ray emission from an accreting WR+cc system is present then it is absorbed and escapes detection. Other explanations of the faintly detected X-ray emission of WN8h stars are not ruled out.
- Publication:
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Research Notes of the American Astronomical Society
- Pub Date:
- May 2021
- DOI:
- 10.3847/2515-5172/ac053b
- Bibcode:
- 2021RNAAS...5..125S
- Keywords:
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- Wolf-Rayet stars;
- 1806