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    PR # 31097                                                                   
     We propose to observe the irregular-type (IR) SNR, HB-9.  While HB-9        
     is typical shell structure at radio wavelength, it is classified as o       
     ne of center-filled SNRs at X-ray wavelength.  We have already observ       
     ed 3 IR SNRs with ASCA and each extent of X-ray above 1keV is larger        
     than that obtained with Einstein/IPC.  So, we suppose that most of IR       
      SNRs are shell-type as shown at radio wavelength, and the outer regi       
     on of them, where the electron temperature is low, are extincted by l       
     arge neutral H column density (~10E22 /cm2). To prove our assumption,       
      we propose to observe the IR SNRs systematically. HB-9 is the most s       
     uitable target for ASCA at the point of view of its size and surface        
     brightness.                                                                 
                                                                                 
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