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   PR # 12219
    WR140=HD193793 (WC7+O4-5) went through the periastron of its highly
    eccentric 7.94-year orbit in March 1993 when the bright X-ray source
    would have been heavily obscured beneath the Wolf-Rayet wind. We plan
    to observe its steady reemergence as the companion stars retreat en-
    abling studies to be made of the system geometry; the binary separat-
    ion dependence of the colliding-winds X-ray luminosity; and the chemi
    cal composition of Carbon-sequence Wolf-Rayet stars. These measure-
    ments will underpin much recent theoretical work on colliding winds
    in hot-star binaries and provide benchmarks for stellar evolution
    calculations.


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