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A.J. Beasley, J.R. Herrnstein (National Radio Astronomy Observatory), L. Ball (Research Centre for Theoretical Astrophysics, University of Sydney)
We present Very Long Baseline Array images of nonthermal microwave emission originating from shock-heated plasma in the wind collision region between the two components (WC7 + O4-5) of the Wolf-Rayet binary system WR140. An extended bow-shock structure is seen at higher frequencies, consistent with a model incorporating electron acceleration in a shock region moving through the stellar wind of the WR star. During 1999-2001 WR140 is approaching periastron, and we plan VLBA high-resolution multi-wavelength monitoring of the position and structure of the shock region.
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