LECTURER: Zuzana Carikova


TITLE: Probing the symbiotic nebulae by the multicolour photometry


ABSTRACT:
In the optical, the spectrum of symbiotic binaries consists of
contributions from the cool giant, symbiotic nebula and the hot star.
Strong emission lines are superposed on the continuum. We introduce a
simple method to extract individual components of radiation from
photometric UBV magnitudes.
We applied the method to classical symbiotic stars AX Per, AG Dra, AG Peg
and Z And, the symbiotic novae RR Tel and V1016 Cyg and the classical nova
V1974 Cyg during its nebular phase. We estimated the electron temperature
and emission measure of the nebula in these systems and the V magnitude of
the giant in the symbiotic objects. Our results are in a good agreement
with those obtained independently by a precious modelling the UV-IR SED.