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   51049
   Supersoft X-ray source (SSS) is a new class of binary X-ray sources
   detected by Einstein and ROSAT in nearby galaxies. Such sources radiate
   near the Eddington limit of a 1 solar mass compact object with
   blackbody temperatures of 10 to 60 eV. Models for the SSS are accreting
   black holes or neutron stars with an extended scattering cloud
   maintained by super Eddington accretion and a white dwarf (WD) in a
   close binary system a ccreting at high rates with steady nuclear
   burning. High resolution spectroscopic observations by ASCA can
   identify the plausible model and can uncover the compact source in the
   SSS.
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