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Title: THE XMM-NEWTON/EPIC X-RAY LIGHT CURVE ANALYSIS OF WR 6

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.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics and Astronomy, East Tennessee State University, Johnson City, TN 37663 (United States)
  2. Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52245 (United States)
  3. Institute for Physics and Astronomy, University Potsdam, D-14476 Potsdam (Germany)
  4. Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, 70 Vassar Street, Cambridge, MA 02139 (United States)
  5. European Space Agency XMM-Newton Science Operations Centre, European Space Astronomy Centre, Apartado 78, Villanueva de la CaƱada, E-28691 Madrid (Spain)
  6. Department of Physics, 191 W. Woodruff Avenue, Ohio State University, Columbus, OH 43210 (United States)
Publication Date:
OSTI Identifier:
22270916
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 775; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COSMIC PHOTONS; COSMIC X-RAY SOURCES; LIMITING VALUES; SATELLITES; STELLAR WINDS; VISIBLE RADIATION; WOLF-RAYET STARS; X RADIATION