Radial velocity measurements and simple sine-curve fits to the orbital velocity variations are presented for the third set of ten contact binary systems : CN And , HV Aqr , AO Cam , YY CrB , FU Dra , RZ Dra , UX Eri , RT LMi , V753 Mon , OU Ser .
All systems but two are contact , double-line spectroscopic binaries with four of them ( YY CrB , FU Dra , V753 Mon , OU Ser ) being the recent discoveries of the Hipparcos satellite project .
The most interesting object is V753 Mon with the mass-ratio closest to unity among all contact systems ( q = 0.970 \pm 0.003 ) and large total mass ( ( M _ { 1 } + M _ { 2 } ) sin ^ { 3 } i = 2.93 \pm 0.06 ) .
Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions .