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   61007
   There is little observational information about protostars because they
   are embedded in dense dust envelope. The hard X-ray can penetrate such
   dense envelope, therefore observations with ASCA, which has imaging
   ability and detection sensitivity of hard X-ray, is most effective to
   investigate directly protostars. In fact, the hard X-ray emission has
   been detected by ASCA from some protostars, but the emission mechanism
   has not yet fully understood. To investigate X-ray emission mechanism
   in protostars, we propose an observation of protostar candidates in
   Taurus molecular cloud. From the ASCA observation, we can reveal the
   magnetic activity and the nature of ambient plasma of protostars.
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