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    PR # 32262                                                                   
     We propose to measure the gas temperature and iron abundance in the         
     distant (z=0.41), rich cluster CL0939+4713 (A851), which has a large        
     population of blue galaxies. HST images show that many of these             
     galaxies are undergoing tidal interactions or mergers (Dressler et          
     al. 1994). The X-ray ``double cluster'' morphology and X-ray       lu       
     minosity of CL0939+47 suggest that it is still undergoing          si       
     gnificant dynamical evolution.  An ASCA observation of CL0939+47   wh       
     ich will determine the temperature and the iron abundance in the   IC       
     M will allow direct comparisons to these parameters measured for   th       
     e sample of more X-ray luminous distant clusters as well as the    sa       
     mple of present epoch clusters.  These comparisons will determine  th       
    e timescales for heavy element                                               
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