In: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 47, no. 2
J. Merc - R. Gális - L. Leedjärv
Detaily:
Rok, strany: 2017, 192 - 199
Kľúčové slová:
AG Draconis, symbiotic binary, outburst activity
URL originálneho zdroja: http://www.astro.sk/caosp/Eedition/Abstracts/2017/Vol_47/No_2/pp192-199_abstract.html
O článku:
AG Draconis is a bright symbiotic binary consisting of a white dwarf
and a pulsating cool giant. Moreover, it is the most intense X-ray source
among symbiotic stars, and one of the best representatives of the super-soft
X-ray objects. The system undergoes characteristic symbiotic activity with
alternating quiescent and active stages. The active ones consist of several
outbursts repeating at about a one-year interval. The recent activity stage
of AG Dra began with the weak pre-outburst in 2015 followed by a more
prominent outburst in 2016. According to photometric and some spectroscopic
observations, both brightenings belong to the minor (hot) outbursts of AG
Dra. Such behavior of the active stage is quite unusual because more often,
the activity of AG Dra starts with a major (cool) outburst. Moreover, the
behavior of Raman scattered OVI lines at
λ 6825 Å and λ 7082 Å suggest that the
minor outburst of AG Dra in April 2016 has the characteristics of both the
hot and cool outbursts. Based on the above, an open question is the next
evolution of activity of the symbiotic binary AG Dra in 2017 and beyond.
Ako citovať:
ISO 690:
Merc, J., Gális, R., Leedjärv, L. 2017. Recent outburst activity of the super-soft X-ray binary AG Draconis. In Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 47, no.2, pp. 192-199. 1335-1842.
APA:
Merc, J., Gális, R., Leedjärv, L. (2017). Recent outburst activity of the super-soft X-ray binary AG Draconis. Contributions of the Astronomical Observatory Skalnaté Pleso, 47(2), 192-199. 1335-1842.