AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 50. High Angular Resolution Science with the NRAO Very Long Baseline Array
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[50.03] VLBA Observations of Colliding Winds in the Wolf-Rayet Binary WR140

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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