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   PR # 42011
   The target 47 Cas was identified in the ROSAT All-Sky Survey as one
   of the strongest single stellar X-ray sources, and at a distance of
   38 pc, as one of the most luminous main-sequence stars known (log
   LX=30.5). Its spectral type of F0V locates the star in a regime where
   it should have a very shallow convective zone and where acoustic
   heating is thought to be the dominant source of coronal heating.
   However, X-ray rotational modulation(P=0.97d), strong X-ray flares,
   giant radio flares, and a strong CIV 1550A emission line argue for a
   magnetic, solar-like corona. The proposed ASCA observations will be
   ideal to study structuring and variability of this corona. A
   significant fraction of the rotation period will be covered.
   Supporting observations at other wavelengths will be arranged.
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