Radial Velocity Studies of Close Binary Stars, 3

Radial velocity measurements and simple sine-curve fits to the orbitalvelocity variations are presented for the third set of ten contact binarysystems: CN And, HV Aqr, AO Cam, YY CrB, FU Dra, RZ Dra, UX Eri, RT LMi, V753Mon, OU Ser. All systems but two are contact, double-line spectroscopicbinaries with four of them (YY CrB, FU Dra, V753 Mon, OU Ser) being the recentdiscoveries of the Hipparcos satellite project. The most interesting object isV753 Mon with the mass-ratio closest to unity among all contact systems (q =0.970 pm 0.003) and large total mass ((M1+M2)sin^3i = 2.93 pm 0.06). Several ofthe studied systems are prime candidates for combined light and radial-velocitysynthesis solutions