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   52063
   RXJ185635-3754 is a 57 eV black body at a distance <120pc, with an
   emitting area of 480 sq km. It is likely to be a isolated old neutron
   star. We propose to examine the 2-10 keV spectrum. If magnetized,
   theory predicts the existence of cyclotron line emission in the 6-15
   keV regime. If accreting, we expect a power-law tail to high energies.
   We propose an ASCA observation to search for this hard X-ray emission.
   Detection of the accretion spectrum would provide limits to the space
   velocity, while detection of the line could confirm that the source is
   a neutron star accreting from the interstellar medium. Absence of a
   cyclotron line demonstrates that either the magnetic field is less than
   10^12G or the star is not accreting.
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