The RV Cass spectrograph at ESO has been used to observe the W UMa star YY Eri, in order to obtain the spectroscopic mass ratio of its components. A new technique has been successfully applied for the measure of radial velocities from intermediate dispersion spectra. The fit of the radial velocities has been done using a Roche lobe model of stellar surfaces which takes into account the distortion of the radial velocity curves due to tidal effects. As a by-product of the procedure a new photometric solution of YY Eri has been obtained through a simultaneous treatment of B and V bands data.
Milano, L.;Russo, G.
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