RADIAL-VELOCITY MEASUREMENTS OF VISUAL BINARIES

This work presents the results of observations of 31 visual binaries with late-type components obtained with the correlation radial velocity spectrometer to resolve the 180-degrees ambiguity in the longitude of the ascending node. The radial velocities of each component were measured for 11 systems with angular separations rho > 1.5''. The sign of the radial velocity difference was found from differential measurements for 12 systems with 0.2'' < rho < 1.5''. New spectroscopic components were detected in three systems. The true ascending node was established for 16 systems from these observations. The velocities of the remaining five systems were measured without resolution into components.