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2. The UV spectra of cataclysmic and symbiotic variables

Creator:
Selvelli, P. L. and Viotti, R.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
UV observations, cataclysmic variables, and symbiotic variables
Language:
Czech
Description:
UV observations of cataclysmic and symbiotic variables with the lUE satellite have given and are giving a fundamental contribution to our knowledge of the nature of these objects. The study of the UV resonance and intercombination lines of the most abundant elements has been used as a diagnostic of the physical conditions in the disk, circumstellar region, and ejecta. Most objects display a strong UV continuum which is usually attributed to emission from the hot component and/or from the accretion disk. The exceptionally long lifetime of lUE has allowed the study of these objects during different activity phases. In the recurrent nova T Cr B dramatic UV variations have been observed during phases of optical quiescence. Of particular interest has been the UV study of the recent outbursts of the symbiotic stars AG Dra, Z And, and PU Vul, as well.that of CH Cyg during the activity phases associated to the formation of a jet. The results of multi-frequency observations (from raďio to x-rays) of some symbiotic variables and their implications for the models are also discussed.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public