SIMULTANEOUS OBSERVATION OF DIRECT AND RAMAN-SCATTERED O-VI LINES IN THE SYMBIOTIC NOVA RR-TELESCOPII

The optical spectra of some symbiotic binaries show two lines in the r ed region of the spectrum that cannot be identified with any known all owed or forbidden transitions. A case has been made that these lines a re Raman-scattered O VI lambda lambda 1032, 1038 emission lines. We pr esent simultaneous far-UV and optical spectra of the symbiotic nova RR Tel, obtained with the Hopkins Ultraviolet Telescope and the Angle-Au stralian Telescope during the Astro-2 Space Shuttle mission. These dat a show the first coincident detection of the strong O VI lambda lambda 1032, 1038 doublet and lambda lambda 6825, 7082 emission lines. The l atter display strong linear polarization and provide new information o n the structure of the nebular material. Our observations provide stro ng evidence for the Raman effect in RR Tel.