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   PR # 21534
    We propose to observe 2 of the 10 brightest X-ray clusters at red-   
    shifts above 0.2 in the Northern sky. The ASCA spectra will allow    
    accurate temperatures & metallicities to be determined for clusters  
    at a substantially earlier epoch in their formation. The proposed    
    targets are drawn from the ROSAT All-Sky Survey & have all been ob-  
    served w/the ROSAT HRI in a co-ordinated optical,radio & X-ray study 
    of the distant clusters of galaxies. The 2 clusters have different   
    optical & radio properties. The more luminous (A2219) is a richness  
    class 3 Abell cluster w/2 head-tail radio sources whereas the other  
    (RX J0439.0+520) is a relatively poor cluster but with the most radio
    luminous central galaxy of any cluster except Cygnus-A. The ROSAT-   
   selected, distant clusters are
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