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   71006
   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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