LECTURER: Mariko Kato, Keio University, Yokohama, Japan.

TITLE: The Symbiotic Nova PU Vul and the Symbiotic Supersoft X-ray Source SMC3.

ABSTRACT:  The light curve of the symbiotic nova PU Vul 1979 outburst
showed a very long flat peak followed by a slow decline.
This flat peak can be explained by a theoretical model that, unlike normal
classical novae, optically-thick winds were not accelerated in PU Vul.
We have constructed a composite light curve model that consists of 
an outbursting WD, a pulsating RG and nebulae. The WD mass in PU Vul is
determined to be about 0.6 Msol from a UV light curve fitting.

SMC3 is a bright supersoft X-ray source in SMC which consists
of a WD and M-giant companion. The WD mass could be very massive
and thus interested in a relation with progenitors of type Ia supernovae.
We present an eclipse model in which an X-ray emitting region around
the WD is almost totally occulted by a swollen RG. The long-term
V light curve variations can be reproduced as an orbital variation of
the irradiated RG.