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   PR # 11057
    The results of PV-Phase observations demonstrate that ASCA is the
    first satellite to separate K-shell line features from  H- and He
    like atoms. The wide energy band of ASCA covers K-line energies of
    many key elements ranging from O to Fe. This provides us with a
    powerful plasma diagnostics in SNRs, and hence enable us to determine
    accurate physical parameters,such as total thermal energy, ionization
    parameter (product of electron density and time after the plasma
    heating), electron temperature and elemental abundance.  Using this
    high capability of ASCA, we intend to study the evolution of SNRs
    systematically. To be free from distance ambiguity, we pick up SNR
    samples from LMC. These SNRs are selected so as to cover long span of
   the age of SNRs.
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