A SPECTROGRAPHIC STUDY OF THE SYMBIOTIC SYSTEM HEN-1761

This work presents the results of a spectroscopic study in the optical and near infrared region of the symbiotic star Hen 1761. Relative flu xes and radial velocities of emission and absorption lines are obtaine d on the basis of low, intermediate and high resolution spectra. Our o bservations show that this scarcely studied object underwent very impo rtant spectroscopic variations in the interval 1990-1995. The observed variations are quite similar to those of symbiotic stars where accret ion events on a hot dwarf are responsible for an eruptive behavior. So me of the physical parameters of the system are derived.