AG Dra - A Symbiotic Mystery

Details AG Dra - A Symbiotic Mystery AG Dra - A Symbiotic Mystery

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..435..339h&link_type=abstract

Binaries - Key to Comprehension of the Universe. Proceedings of a conference held June 8-12, 2009 in Brno, Czech Republic. Edite

Astronomy and Astrophysics

Astronomy

Scientific paper

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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