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   53011
   ROSAT observations of W 63 revealed center-filled X-ray emission, in
   contrast to the shell-like radio morphology. The population of these
   composite SNR is found to be high (>25%) among X-ray detected SNR (Rho
   1995), and a hypothesis invoking evaporation of clouds appears most
   consisitent with X-ray data. However, W63 is located 5 degree away from
   Galactic plane and shows no evidence of interacting with molecular
   clouds. We propose two ASCA pointings at the interior of W63, to map
   the temperature, electron density, and abundances using an ionization
   nonequilibrium model, and to examine whether evaporation is the global
   mechanism of center-filled emission or another mechanim such as thermal
   conduction applies to W63.
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