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   PR # 11049
    Composite SNR have shell-like radio morphology but appear center-
    filled in X-rays.X-ray emission is thought (or in some cases known)
    to be thermal, themorphology possibly due to the evaporation of dense
    clouds in the SNRs: W44,MSH 11-61A, and MSH 15-56. A 40ks exposure is
    requested per object. The observational goals are: i.)map the temper-
    ature, density, snd metal abundances,using NEI models, to as high a
    spatial resolution as can be accomplished in an ASCA exposure;
    ii.)determine the consequences of varying line of sight absorption on
    their morphology; iii.)compare the information thus obtained with the
    evaporation models to infer the degree of validity of this model.


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