Radial-velocity measurements and sine-curve fits to the orbital radial velocity variations are presented for ten close binary systems : EG Cep , V1191 Cyg , V1003 Her , BD+7°3142 , V357 Peg , V407 Peg , V1123 Tau , V1128 Tau , HH UMa , and PY Vir .
While most of the studied eclipsing systems are contact binaries , EG Cep is a detached or a semi-detached double-lined binary and V1003 Her is a close binary of an uncertain type seen at a very low inclination angle .
We discovered two previously unknown triple systems , BD+7°3142 and PY Vir , both with late spectral-type ( K2V ) binaries .
Of interest is the low-mass ratio ( q = 0.106 ) close binary V1191 Cyg showing an extremely fast period increase ; the system has a very short period for its spectral type and shows a W-type light curve , a feature rather unexpected for such a low mass-ratio system .