A Radial-velocity Search for Binary RR Lyrae Variables

We report 272 radial velocities for 19 RR Lyrae variables. For most of the stars we have complete pulsation cycle. These data are used to determine robust center--of--mass that been compared values from literature in a search evidence binary systems. Center--of--mass were determined each star using Fourier Series and Template fits velocities. Our uncertainties $\pm0.16$ km s$^{-1}$ $\pm$2.5 s$^{-1}$, with mean uncertainty $\pm$0.92 s$^{-1}$. combined our look deviations velocity star. Fifteen show no motion (BK And, CI Z CVn, DM Cyg, BK Dra, Gem, XX Hya, SZ Leo, BX TT Lyn, CN Lyr, TU Per, U Tri, RV UMa, AV Vir). In cases this conclusion is reached due sporadic sampling over time. Three suspicious variation may indicate but do not prove it (SS ST AO Peg). UMa was observed by us near predicted periastron passage (at 0.14 orbital phase) absence additional make detection, based on alone, uncertain. Two sample $H\gamma$ emission phases 0.9--1.0: SS Leo UMa.