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   82011
   AR Lac is an eclipsing RS CVn binary system of 2 days orbital period
   which has been extensively studied by most X-ray satellites since
   Einstein, but typically in observations that are similar or shorter in
   length to its orbital period. This limitation has compromised previous
   attempts to do eclipse-mapping studies of the spatial distribution of
   the coronal plasma in this system, because of the difficulty of
   distinguishing between transient events and persistent spatial
   structures. In this proposal, we ask for 360 ksec of exposure time so
   as to observe 5 orbital periods of AR Lac which will allow us to
   eliminate this uncertainty. We will also study AR Lac's X-ray flare
   frequency, and do time-resolved (e.g., phase-binned) spectroscopy.
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