Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the fifth set of ten close binary systems : V376 And , EL Aqr , EF Boo , DN Cam , FN Cam , V776 Cas , SX Crv , V351 Peg , EQ Tau , KZ Vir .
All systems are double-lined spectroscopic contact binaries ( KZ Vir may be a low inclination , close , non-contact binary ) , with seven ( all except EL Aqr , SX Crv and EQ Tau ) being the recent photometric discoveries of the Hipparcos satellite project .
The most interesting object is SX Crv , a contact system with an unprecedently low mass ratio , q = 0.066 \pm 0.003 , whose existence challenges the current theory of tidal stability of contact systems .
Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions .