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   PR # 42050
   Accretion Disk Corona (ADC) have taken on an important new role our
   view of Low-Mass X-ray Binaries. They are now seen as the possible
   source of a wind which may accelerate the evolution of LMXB by 100
   times. This accelerated evolution would allow the lifetime of LMXB to
   be in agreement with the postulate that LMXB are the progenitors of
   milli-second pulsars, a postulate widely held. However, our
   understanding of ADC is remarkably poor. As the main parameter
   effecting the structure of ADC is the x-ray illumination,
   observations of systems over a wide range of x-ray flux should be
   enlightening. 4U2129+47 offers the ONLY opportunity for ASCA to
   observe an ADC source in a low state.
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