Abstract
The conditions of the excitation of ultraviolet emission lines in symbiotic stars-triple systems with white dwarf and nebular clouds are examined. A new method is suggested for the determination of effective temperatureT* of the accretion disk around of white dwarf, which is based on the balance between the summary intensitiesEe=ΣEi of ultraviolet emission lines, escaped by nebular cloud, and a definite part of the energy of black-body radiation of accretion disk in the region shorter from the some wavelengthλ0. This condition brings us to the formula (9) which is used for the determination of the temperatureT* and radiusrn of nebular cloud around the symbiotic system. It is shown that practically in all casesλ0=180 A=const. The results of the application of this method in relation to the five symbiotic triple-star systems are presented in Tables III and IV.
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