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Paper: AG Dra – A Symbiotic Mystery
Volume: 435, Binaries – Key to Comprehension of the Universe
Page: 339
Authors: Hric, L.; Gális, R.; Kundra, E.
Abstract: AG Dra is well known bright symbiotic binary (type Z And). We detected two periods of variability in this system. Moreover we found resonance between both periods which can be responsible for the activity of AG Dra. Nevertheless, many questions are still open and it is also worth noting them: where is the recent stage of quiescence?, why the maximum of brightness during the year 2008 was occurred earlier?, how many types of outbursts are present in the system? and how to explain the behaviour of emission lines?
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