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arXiv 1607.06804astro-ph.SR
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共生复发新星T CrB的活动相和闪烁

Active phases and flickering of a symbiotic recurrent nova T CrB

Krystian Ilkiewicz, Joanna Mikolajewska, Kiril Stoyanov, Antonios Manousakis, Brent Miszalski

摘要:

T CrB是一颗共生的复发新星,已知表现出活跃的阶段,其特征是热成分温度的明显增加和闪烁的出现,即在分钟的时间尺度上观察到的通量的变化。历史上的紫外线观测已经排除了轨道可变性作为闪烁的解释,而是建议闪烁是由可变的质量转移引起的。我们已经分析了光学和X射线观测调查的闪烁的性质,以及在T CrB的活动阶段。分光光度观测证实,活动期有~ 1000 d和~ 5000 d两个周期。X射线中的闪烁被检测到,并且遵循与光学中观察到的类似的振幅-通量关系。闪烁在较硬的X射线能量下最为突出,这表明它起源于吸积盘和白矮星之间的边界层。来自边界层的X射线辐射然后被厚的吸积盘或星云再处理成紫外线辐射。更详细的了解闪烁将受益于长期同步X射线和光学监测的现象,在共生复发新星和相关的系统,如Z和型共生星。

英文摘要:

T CrB is a symbiotic recurrent nova known to exhibit active phases, characterised by apparent increases in the hot component temperature and the appearance of flickering, i.e. changes in the observed flux on the time-scale of minutes. Historical UV observations have ruled out orbital variability as an explanation for flickering and instead suggest flickering is caused by variable mass transfer. We have analysed optical and X-ray observations to investigate the nature of the flickering as well as the active phases in T CrB. The spectroscopic and photometric observations confirm that the active phases follow two periods of ~1000d and ~5000d. Flickering in the X-rays is detected and follows an amplitude-flux relationship similar to that observed in the optical. The flickering is most prominent at harder X-ray energies, suggesting that it originates in the boundary layer between the accretion disc and the white dwarf. The X-ray radiation from the boundary layer is then reprocessed by a thick accretion disc or a nebula into UV radiation. A more detailed understanding of flickering would benefit from long-term simultaneous X-ray and optical monitoring of the phenomena in symbiotic recurrent novae and related systems such as Z And type symbiotic stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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