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   71020
   We propose the systematic spectral study of massive Wolf-Rayet binaries
   with ASCA. All the proposed targets have been not detected in the hard
   X-ray band. Then the first goal is to detect the hard X-ray emission.
   With the spectroscopic capability of ASCA, we will find the emission
   lines from highly ionized ions, which give a firm evidence for the
   shock-heated plasma due to the wind-wind collision. We try to determine
   absorption column, temperature, and luminosity for the hard component.
   We also check whether the hard component varies or not. With these
   observational results, we will construct the unified model for the
   massive W-R binaries. Furthermore, we estimate the abundances by
   fitting the spectra. We compare them with the WR type (WN and WC) and
   test the chemical evolution model.
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