The peculiar outburst activity of the symbiotic binary AG Draconis

0522125 - FZÚ 2020 RIV CZ eng C - Conference Paper (international conference)
Gális, R. - Merc, J. - Leedjärv, L. - Vrašťák, M. - Karpov, Sergey
The peculiar outburst activity of the symbiotic binary AG Draconis.
Proceedings of the Conference on Variable Stars Research /50./. Brno: Nicholas Copernicus Observatory and Planetarium, 2019 - (Kocián, R.), s. 15-20. ISSN 1801-5964.
[Conference on Variable Stars Research /50./. Brno (CZ), 30.11.2018-02.12.2018]
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : AG Draconis * LC * outburst
OECD category: Astronomy (including astrophysics,space science)
http://astro.sci.muni.cz/variables/oejv/issues/oejv0197.pdf

AG Draconis is a strongly interacting binary system which manifests characteristic symbiotic activity of alternating quiescent and active stages. The latter ones consist of the series of individual outbursts repeating at about a one-year interval. After seven years of flat quiescence following the 2006–2008 major outbursts, in the late spring of 2015, the symbiotic system AG Dra started to become brighter again toward what appeared to be a new minor outburst. The current outburst activity of AG Dra was confirmed by the following three outbursts in April 2016, May 2017 and April 2018. The photometric and spectroscopic observations suggest that all these outbursts are of the hot type. Such behaviour is considerably peculiar in almost 130-year history of observing of this object, because the major outbursts at the beginning of active stages are typically cool ones. In the present work, the current peculiar activity of the symbiotic binary AG Dra is described in detail.

Permanent Link: http://hdl.handle.net/11104/0306636