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| Paper: |
The Colliding Winds of Cyg OB2 No. 8A |
| Volume: |
425, Hot and Cool: Bridging Gaps in Massive Star Evolution |
| Page: |
289 |
| Authors: |
Blomme, R. |
| Abstract: |
Cyg OB2 No. 8A is an O6 If + O5.5 III(f) colliding-wind binary with a period of 21.9 days. Our VLA radio observations have detected non-thermal radiation that is due to the synchrotron emission from the colliding-wind region. The radio fluxes vary in a correlated way with orbital phase, which is quite unexpected, as all synchrotron emission should to be absorbed by the free-free absorption in the stellar wind material. We develop radiative transfer models for this system, which show that this orbit-locked variability can indeed be explained. This type of radio-detectable binary is important for binary statistics and for studying clumping and porosity in the stellar wind. |
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