X-ray Observations of Binary and Single Wolf-Rayet Stars with XMM-Newton and Chandra |
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Authors: | Stephen Skinner Manuel Güdel Werner Schmutz Svetozar Zhekov |
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Affiliation: | (1) CASA, 389 UCB, Univ. of Colorado, Boulder, CO 80309, USA;(2) Paul Scherrer Inst., Würenlingen und Villigen, CH-5232 Villigen PSI, Switzerland;(3) Physik-Met. Observatorium Davos (PMOD), Dorfstrasse 33, CH-7260 Davos Dorf, Switzerland;(4) Space Research Inst., Moskovska Str. 6, Sofia, 1000, Bulgaria;(5) JILA, 440 UCB, Univ. of Colorado, Boulder, CO 80309, USA |
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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. |
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Keywords: | Stars:Wolf-Rayet Stars:X-rays |
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