The systemic velocities of four long-period cataclysmic variable stars

  title={The systemic velocities of four long-period cataclysmic variable stars},
  author={R. C. North and Thomas R. Marsh and Ulrich C. Kolb and Vik S. Dhillon and C. K. J. Moran University of Southampton and Open University and University of Sheffield and Met Office},
  journal={Monthly Notices of the Royal Astronomical Society},
Although a large number of orbital periods of cataclysmic variable (CV) stars have been measured, comparison of period and luminosity distributions with evolutionary theory is affected by strong selection effects. A test has been discovered that is independent of these selection effects and is based upon the kinematics of CVs. If the standard models of evolution are correct then long-period (Porb > 5 h) CVs should be typically less than 1.5 Gyr old, and their line-of-sight velocity dispersion… 
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