Radial velocity studies of close binary stars. I.

Radial velocity data are presented for 10 W UMa-type systems-GZ And, V417 A ql, LS Del, EF Dra, V829 Her, FG Hya, AP Lee, UV Lyn, BE Peg, and AQ Psc-to gether with preliminary circular-orbit determinations of spectroscopic elem ents, with the main goal of obtaining mean radial velocities and mass ratio s for these systems. This is the first part of a series that will contain r adial velocity data for northern hemisphere, short-period eclipsing binarie s, accessible to medium-resolution spectroscopic studies with 1.8 m-class t elescopes.