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   PR # 42021
   Gamma Velorum (WC8+O9I) is a central object for the new and emerging
   field of colliding--wind studies. It is an eccentric Wolf-Rayet
   +O-star binary, with a period of 78.5 days. Understanding of
   colliding wind X-ray emission from Gamma Velorum has been
   significantly advanced by ASCA observations at phases 0.4 and 0.5.
   Detailed modelling of these ASCA observations using hydrodynamic
   simulations of colliding winds have enabled the first determination
   of stellar wind parameters by X-ray spectroscopy. We wish to extend
   our phase coverage of Gamma Vel. These observations will enable us to
   obtain a more complete picture of colliding winds, such as how binary
   separation affects X-ray emission, and enable more detailed spectral
   modelling of the system.
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