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A large number of white dwarf and donor masses in cataclysmic variables havebeen found via modelling the primary eclipse, a method that relies on untestedassumptions. Recent measurements of the mass of the white dwarf in thecataclysmic variable GY Cnc, obtained via modelling its ultraviolet spectrum,conflict with the mass obtained via modelling the eclipse light curve. Here wemeasure the radial velocity of the absorption lines from the donor star in GYCnc to be $K_{\rm abs} = 280 \pm 2$ kms$^{-1}$, in excellent agreement with theprediction based on the masses derived from modelling the eclipse light curve.It is possible that the white dwarf mass derived from the ultraviolet spectrumof GY Cnc is affected by the difficulty of disentangling the white dwarfspectrum from the accretion disc spectrum.

The donor star radial velocity curve in the cataclysmic variable GY Cnc confirms white dwarf eclipse modelling mass