The dominant X-ray wind in massive star binaries

Details The dominant X-ray wind in massive star binaries The dominant X-ray wind in massive star binaries

2002-04-15

arxiv.org/abs/astro-ph/0204236v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, accepted by A&A Letters

Scientific paper

10.1051/0004-6361:20020583

We investigate which shocked wind is responsible for the majority of the X-ray emission in colliding wind binaries, an issue where there is some confusion in the literature, and which we show is more complicated than has been assumed. We find that where both winds rapidly cool (typically close binaries), the ratio of the wind speeds is often more important than the momentum ratio, because it controls the energy flux ratio, and the faster wind is generally the dominant emitter. When both winds are largely adiabatic (typically long-period binaries), the slower and denser wind will cool faster and the stronger wind generally dominates the X-ray luminosity.

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