RADIAL-VELOCITY MEASUREMENTS OF VISUAL BINARIES

This work presents the results of observations of 31 visual binaries w ith 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 meas ured for 11 systems with angular separations rho > 1.5''. The sign of the radial velocity difference was found from differential measurement s for 12 systems with 0.2'' < rho < 1.5''. New spectroscopic component s were detected in three systems. The true ascending node was establis hed for 16 systems from these observations. The velocities of the rema ining five systems were measured without resolution into components.