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   PR # 22112
    We propose observations of the two center-bright remnants 3C400.2 and
    Kes 27 with the ASCA detectors.  These unusual remnants show a shell 
    structure in the radio but a center-bright structure in X-rays.      
    Previous studies have  not conclusively determined the nature of the 
    X-ray emission.  We will perform a spatially resolved spectral study 
    of these remnants with ASCA to determine the extent to which the     
    X-ray emission is due to thermal or nonthermal mechanisms and search 
    for differences in the spectra from the X-ray bright central regions 
    relative to the spectra from outer regions coincident with the radio 
    shells.  Such a study requires the good spectral resolution, broad   
    energy coverage, and simultaneous spatial resolution available with  
   the ASCA SIS and GIS.         
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