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   62012
   We have obtained {\\it ASCA} X-ray spectra of the canonical colliding-
   wind binary star WR 140 (WC7+OB) during the PV, AO1 and AO5 intervals.
   We need continuing {\\it ASCA} monitoring to measure the variability of
   the X-ray spectrum through the entire orbit. This X-ray lightcurve will
   provide the most accurate measure of the interaction region and
   redefine the physics of colliding-wind systems. The previous {\\it
   ASCA} observations show that the spectrum has changed from a highly-
   absorbed, predominantly thermal spectrum to a less absorbed but {\\it
   predominantly non-thermal} model. This is a very surprising result, not
   predicted in standard colliding wind models, and suggests that Fermi
   acceleration of particles at the wind shock boundary is important.
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