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arXiv 1806.05935astro-ph.SR
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共生双星AG Draconis最近的爆发活动

Recent outburst activity of the symbiotic binary AG Draconis

Jaroslav Merc, Rudolf Gális, Laurits Leedjärv

摘要:

共生双星AG Dra有规律地经历了平静和活跃两个阶段,其中包括间隔约360 d的多次爆发。AG Dra最近的爆发活动始于2015年春末的轻微爆发,并由2016年4月和2017年5月的爆发明确证实。在所提出的工作中,光度和光谱行为的最近爆发活动的AG Dra的详细介绍。此外,还根据突出发射线的行为研究了AG Dra中白矮星的温度。我们发现,在观测到的发射线的变化的特定效果的解纠缠是至关重要的调查的内在白矮星的温度变化相关的爆发活动,这种强相互作用的二进制。我们还报告了低激发线轨道变化和H $_β$吸收分量对它们的等效宽度的影响,以及我们以前的工作中使用的近似的后果。

英文摘要:

The symbiotic binary AG Dra regularly undergoes quiescent and active stages which consist of several outbursts repeating with about 360d interval. The recent outburst activity of AG Dra started by the minor outburst in the late spring of 2015 and was definitely confirmed by the outbursts in April 2016 and May 2017. In the presented work, the photometric and spectroscopic behaviour of the recent outburst activity of AG Dra is presented in detail. Moreover, the temperature of the white dwarf in AG Dra is studied based on the behaviour of the prominent emission lines. We show that a disentanglement of particular effects in the observed changes of the emission lines is crucial to investigate the intrinsic white dwarf temperature variations related to outburst activity of this strongly interacting binary. We also report the effects of the low excitation lines orbital variations and of the H$_β$ absorption component on their equivalent widths as well as consequences of the approximations used in our previous works.

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