Presented at the 84th
AAVSO Annual Meeting, October 28, 1995
PU Vul is a very slowly
evolving symbiotic nova. AAVSO observations spanning 15 years are used to show
that the system is an eclipsing binary with a period of 13.42 + 0.02 years.
Modeling of the eclipse shapes indicates that radii of both components of the
binary have decreased between 1980 and 1994. The cause for the shrinkage in the
size of the giant star is unknown.