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   71037
   Massive X-ray binaries with compact stars are bright X-ray sources in
   our Galaxy. However, the population of this class of objects is rather
   small. Nevertheless, these objects yield important information on the
   collapsed relativistic stars and survey of such sources is further
   needed to investigate the formation and evolution of massive binaries
   with compact stars. We propse here to observe three OB star X-ray
   binaries (LS 5039, BSD 24-491 and LS1698) which are selected from the
   ROSAT Galactic Plane survey catalog. These three sources are expected
   to be massive X-ray binary pulsars. Search of coherent pulsations and
   spectral analysis will be attemped to identify the properties of these
   massive binaries, when the proposed observations are carried out.
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