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   52010
   X-ray coronae of Hertzsprung-gap giants are among the hottest known
   (log T > 7.2); reminiscent of flares on the Sun, or on classical flare
   stars. Yet, the F0-G1 giants as a group are not noted for transient UV
   or X-ray outbursts. The paradox (flare-temperature gas, but lack of
   overt flaring behavior) bears on the nature of coronal heating at the
   crucial evolutionary juncture where shallow convective envelopes first
   emerge; the key transition between hot-star and cool-star X-ray
   activity. ASCA can add unique insight by directly detecting the hottest
   coronal gas; short-term variability of the multi-keV X-rays; and
   anomalous coronal abundances. HR9024 (G1 III), an intriguing transition
   object within the transition class, is a promising target to continue
   our program.
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