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   PR # 41033
   We have recently developed a hard X-ray spectroscopic method of
   determining the mass of the white dwarf in Magnetic Cataclysmic
   Variables (MCVs). This method is more advantageous than the
   conventional method using the dynamical motion of the binary
   components in that our method just utilizes the depth of
   gravitational potential of the white dwarf and hence applicable to
   all the MCVs irrespective of whether they are eclipsing systems or
   not. We propose to observe the eclipsing system XY Ari additionally
   80ksec in order to establish the reliability of our new method by
   comparing with the traditional dynamical motion method.
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