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   PR #   139
   The 2.86 day eclipsing binary Algol will be observed through its
   secondaryeclipse. This system contains a B+K star binary, with strong
   coronal X-raysthought to originate from the G star. An observation
   through the eclipse ofthe G star by the B offers an opportunity to
   measure the spatial structureof the coronal X-ray emission. EXOSAT
   observations have suggested the 30million degree emission comes from a
   region comparable in size to thebinary separation. The increased
   sensitivity of ASCA will give anunprecedented X-ray spectrum as a
   function of binary phase.
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