Abstract
Time-resolved spectroscopic observations of the eclipsing cataclysmic variable UU Aqr are presented. The high-resolution data show that Hα has a strong, phase-dependent, asymmetric profile. The radial velocity curve, derived from the broad line wings, shows a semiamplitude of 120 km/s. Amplitude and phase for the S-wave are also derived. A mass ratio of 0.4 and a mass of 0.9 M ⊙ for the white dwarf are obtained. The emission line behavior suggests that most of the Hα emission comes from an optically thin hot spot, while the accretion disk must be optically thick
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