Astron. Astrophys. Suppl. Ser. 132, 281-289

A spectrographic study of the symbiotic system Hen 1761

E. Brandi^1,2 - R. Barbá^1.3 - L.G. García¹ - N. Beltrán¹

Send offprint request: E. Brandi

1 - Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Argentina
e-mails: ebrandi@fcaglp.fcaglp.unlp.edu.ar; rbarba@fcaglp.fcaglp.unlp.edu.ar; lia@fcaglp.fcaglp.unlp.edu.ar
2 - Member of the Carrera del Investigador Científico, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC), Argentina
3 - Member of the Carrera del Investigador Científico, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina

Received August 14, 1997; accepted April 24, 1998

Abstract:

This work presents the results of a spectroscopic study in the optical and near infrared region of the symbiotic star Hen 1761. Relative fluxes and radial velocities of emission and absorption lines are obtained on the basis of low, intermediate and high resolution spectra. Our observations show that this scarcely studied object underwent very important spectroscopic variations in the interval 1990-1995. The observed variations are quite similar to those of symbiotic stars where accretion events on a hot dwarf are responsible for an eruptive behavior. Some of the physical parameters of the system are derived.

Key words: stars: emission-lines -- symbiotic stars -- stars: variable stars -- stars: individual: Hen 1761