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   PR # 12146
     The periodic nature of the dips observed in several LMXRB, combined
    with their energy dependence, indicate that they are caused by oscura
    tion of the X-ray source by thickened region at the outer edge of the
    disk. Previous study show a soft excess during the dip which can not
    be explained with a cold absorber model. We propose to observe 4U1624
    -69, the big dipper, through an orbital cycle (21 hours) covering one
    6 hours duration dip. Studying with ASCA intensity selected spectra
    during the dip will give for the first time the possibility to test
    the different models proposed to explain the low energy excess during
    the dip.


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