X-ray Observations of Binary and Single Wolf-Rayet Stars with XMM-Newton and Chandra
Authors: Skinner, Stephen; Güdel, Manuel; Schmutz, Werner; Zhekov, Svetozar
Source: Astrophysics and Space Science, Volume 304, Numbers 1-4, August 2006 , pp. 97-99(3)
Abstract:We present an overview of recent X-ray observations of Wolf-Rayet (WR) stars with XMM-Newton and Chandra. These observations are aimed at determining the differences in X-ray properties between massive WR + OB binary systems and putatively single WR stars. A new XMM spectrum of the nearby WN8 + OB binary WR 147 shows hard absorbed X-ray emission (including the Fe Kα line complex), characteristic of colliding wind shock sources. In contrast, sensitive observations of four of the closest known single WC (carbon-rich) WR stars have yielded only non-detections. These results tentatively suggest that single WC stars are X-ray quiet. The presence of a companion may thus be an essential factor in elevating the X-ray emission of WC + OB stars to detectable levels.
Document Type: Research Article
Publication date: August 1, 2006