The spectrum of the symbiotic nova HBV 475 in 1969 II.

Results are presented of a complete analysis of the first spectroscopic observations of the symbiotic nova HBV 475 (= V1329 Cyg) obtained with the 183-cm reflector of the Dominion Astrophysical Observatory in October-December 1969. Data show the presence of three main line systems: (1) narrow lines with a wide ionization range, up to doubly ionized CNO, showing a velocity gradient; (2) a broad line system which includes the strongest emission lines of H, He II, forbidden Ne III line and forbidden O III line, which displays a complex structure with up to 10 individual components; and (3) a WR-type line system which includes broad and shallow emissions corresponding to those observed in WN5 stars, with a velocity expansion of 2300 km/sec. A binary model of HBV 475 is developed, in which the narrow lines are formed in different regions of the cool giant's wind ionized by the radiation of the hot star.