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   PR # 21512
    The ~100 eV EW Fe K-line revealed with the EXOSAT GSPC from the low  
    mass X-ray binary 4U1958+11 is characterised by the second highest   
    value of the centroid energy (7.06+/-0.09 keV). This is marginally   
    consistent with emission from H-like iron ions and likely requires a 
    substantial blueshift. We propose a 40 ks ASCA observation of        
    4U1957+11 the main objective of which is to accurately measure the   
    centroid energy of the Fe-line and set tighter constraints on the    
    line width (or possibly measure it). This can provide important clues
    on the line emission process, the source geometry and the dynamics of
    the plasma motion in the vicinity of the accreting collapsed star.   
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