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   PR # 12097
    We propose to observe the 1.20 day eclipsing Algol system RZ Cas. The
    ROSAT PSPC spectrum could not be well fit by a two component thermal
    plasma modelwith solar abundances. Instead either a two temperature
    model with 10 to 20 percent solar abundances, or a solar abundance
    thermal plus a power law gives a good fit. The power law suggests non
    -thermal emission, which would explain previous discrepancies in the
    Fe abundance measured from Algol and RS CVn systems, and the failure
    to detect a high energy eclipse. The extended energy band and much im
    proved spectral resolution of ASCA will distinguish the two possible
    spectral models. We will search for absorption and variability assoc-
    iated with the eclipse and arrange VLA coverage.

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