The ultraviolet variability of the symbiotic star HBV 475. III. The periodicity of HBV 475.
Schmutz, W.; Vogel, M.; Nussbaumer, H.
Switzerland, Germany
Abstract
The symbiotic star HBV 475 (= V1329 Cyg) shows periodic variations in its spectrum, both in flux and in the wavelength positions of the emission lines. New IUE observations, extending to the October 1985 flux maximum, allow an improved period and phase determination. The periodic variation of the line profiles are interpreted as being due to illumination effects from a hot star on a stellar wind around a cool star, the hot star moving on an elliptical orbit. This model is consistent with the line flux variations observed in this object.