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   73004
   We propose to use the ASCA satellite to systematically study the X-ray
   light curve of the the eclipsing binary CF Tuc concentrating on the
   time of the optical primary minimum. The main goal of the proposed
   study is to see whether an X-ray eclipse of the smaller G star by the
   larger and more rapidly rotating K star is a persistent feature of the
   light curve. The persistent occurrence of X-ray eclipses has important
   consequences for the structural stability of CF Tuc's corona as well as
   its spatial confinement.
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