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   PR # 43008
   We propose to observe the eclipsing Algol-type binary RZ Cas for 40
   ks, providing the first full-orbit X-ray lightcurve with ASCA of an
   Algol-type system besides Algol. It will be possible to interpret the
   origin of the time variability previously found. The S/N ratio of the
   ASCA SIS spectrum will be sufficient to reliably determine the metal
   abundances and search for temperature and abundance variations on
   various timescales. By simultaneous ROSAT/HRI, IUE, optical, infrared
   (allocated) and VLA (proposed) observations, the temperature profile
   and spatial structure of the atmosphere can be deduced. In the case
   of a flare, unique time variability studies in the various spectral
   bands can be performed, and abundance variations can be investigated.
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