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   71031
   Although many theories of close binary system predict the existence of
   early-type main sequence stars (Be) with a white dwarf companion, the
   system is not yet discovered, except Gamma Cas. ROSAT surveyed OB and
   OBe stars aimed at finding Be + white-dwarf system, but any evidence
   was not found. This was because the ROSAT band could not distinguish
   the coronal X-rays of OB stars from the companion. ROSAT also did not
   cover the 6.7 keV Fe line necessary to probe 10keV thin thermal plasma.
   Thanks to the ASCA's wide energy band up to 10 keV, accreting white-
   dwarf is detectable. We have observed only one candidate system, Gamma
   Cas. To firmly prove the existence of a Be + white dwarf system, we
   propose to observe another example.
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