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   73005
   We propose to obtain phase-resolved ASCA observations of the dwarf nova
   OY Car during quiescence. If an X-ray eclipse of the boundary layer is
   seen, we will use the eclipse geometry to constrain the size and
   location of the X-ray emission relative to the white dwarf. We will use
   spectral modelling to measure the local column density at different
   orbital phases in a search for azimuthal asymmetry of the absorbing
   material. We will compare the values obtained from our X-ray
   measurements with those deduced from the ``iron curtain'' seen in the
   HST UV spectra, thereby resolving the apparent discrepancies between
   previous non-simultaneous measurements. This proposal is Time Critical
   because we are requesting HST time simultaneous with the ASCA
   observations.
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