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    PR # 32076                                                                   
     We propose simultaneous observations of Cyg X-2 with ASCA and HST.          
     Simultaneous GINGA and IUE observations of Cyg X-2 showed an unique         
     relationship between the X-ray spectral states and the UV flux;             
     however, IUE is not able to measure the short timescales of interest        
     (e.g. prominent dips lasting from 100-1000s; QPOs from 1-60 Hz; and         
     line variability on timescales of minutes).  With the HST, we can           
     measure variability of the UV spectra on 50ms timescales.  From             
     delays between X-ray and UV line variations, we can analyze the             
     radial structure of Doppler velocity in the disk.  This will provide        
     an unprecedented probe into the structure  and dynamics of the              
     accretion flow, enable us to test models of the X-ray and UV                
    emission, and constrain proper                                               
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