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|a Ignace, R.
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Huenemoerder, David P.
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|a Gayley, K. G.
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|a Hamann, W.-R.
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|a Huenemoerder, David P.
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|a Oskinova, Lidia M.
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|a Pollock, A. M. T.
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|a McFall, M.
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|a THE XMM-NEWTON /EPIC X-RAY LIGHT CURVE ANALYSIS OF WR 6
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|b Institute of Physics/American Astronomical Society,
|c 2015-02-04T18:54:04Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/93755
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|a We obtained four pointings of over 100 ks each of the well-studied Wolf-Rayet star WR 6 with the XMM-Newton satellite. With a first paper emphasizing the results of spectral analysis, this follow-up highlights the X-ray variability clearly detected in all four pointings. However, phased light curves fail to confirm obvious cyclic behavior on the well-established 3.766 day period widely found at longer wavelengths. The data are of such quality that we were able to conduct a search for event clustering in the arrival times of X-ray photons. However, we fail to detect any such clustering. One possibility is that X-rays are generated in a stationary shock structure. In this context we favor a corotating interaction region (CIR) and present a phenomenological model for X-rays from a CIR structure. We show that a CIR has the potential to account simultaneously for the X-ray variability and constraints provided by the spectral analysis. Ultimately, the viability of the CIR model will require both intermittent long-term X-ray monitoring of WR 6 and better physical models of CIR X-ray production at large radii in stellar winds.
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|a United States. National Aeronautics and Space Administration (Smithsonian Astrophysical Observatory contract SV3-73016, Chandra X-Ray Center and Science Instruments)
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|a German Aerospace Center (DLR) (grant 50 OR 1302)
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|a Article
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|t Astrophysical Journal
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