Chandra HETG Observations of the Colliding Stellar Wind System WR 147

Details Chandra HETG Observations of the Colliding Stellar Wind System WR 147 Chandra HETG Observations of the Colliding Stellar Wind System WR 147

2010-07-25

arxiv.org/abs/1007.4352v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

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

Scientific paper

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).

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