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   PR # 22003
    Detection of x-rays from several planetary nebulae by ROSAT opens a  
    new area of research. ROSAT spectra show that the emitting gas is too
    hot to be from the star, but cooler than expected from the shocked   
    stellar wind. ASCA line spectra of BD~+30~3639 will allow us to      
    determine the temperature and chemical composition of the emitting   
    gas. The emission is likely to arise in  mass-loaded flows of the    
    hot, shocked stellar wind past cooler nebular material. The wind and 
    nebula in BD~+30~3639 have very different chemical compositions, so  
    the extent of mixing can be determined. Because the wind-nebula      
    interaction is of wide importance, we have obtained HST time to image
    this nebula. ASCA observations will be crucial for interpreting the  
   HST images and understanding t
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