Chandra HETG Observations of the Colliding Stellar Wind System WR 147

Abstract

We present an extended analysis of deep Chandra HETG observations of the WR+OB binary system WR 147 that was resolved into a double X-ray source (Zhekov & Park, 2010, ApJ, 709, L119). Our analysis of the profiles of strong emission lines shows that their centroids are blue-shifted in the spectrum of the northern X-ray source. We find no suppressed forbidden line in the He-like triplets which indicates that the X-ray emitting region is not located near enough to the stars in the binary system to be significantly affected by their UV radiation. The most likely physical picture that emerges from the entire set of HETG data suggests that the northern X-ray source can be associated with the colliding stellar wind region in the wide WR+OB binary system, while the X-rays of its southern counterpart, the WN8 star, are result from stellar wind shocking onto a close companion (a hypothesized third star in the system).

22 pages, 6 figures, 2 Tables; accepted for publication in The Astrophysical Journal

References in corpus (4)

• X-Ray Spectroscopy of Stars
• Colliding Stellar Wind Models with Nonequilibrium Ionization: X-rays from WR 147
• Discovery of X-ray Emission from the Wolf-Rayet star WR142 of oxygen subtype
• XMM-Newton X-ray Observations of the Wolf-Rayet Binary System WR 147

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• Colliding stellar wind modelling of the X-ray emission from WR 140
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• A Chandra Observation of the Eclipsing Wolf-Rayet Binary CQ Cep
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• A Radio Pinwheel Emanating from WR147
• X-rays from the oxygen-type Wolf-Rayet binary WR30a
• A global view on the colliding-wind binary WR 147
• Variability in X-ray line ratios in helium-like ions of massive stars: the radiation-driven case
• Chandra revisits WR48a: testing colliding wind models in massive binaries
• A concept for the X-ray telescope system with an angular-resolution booster