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arXiv 2309.07643astro-ph.SRastro-ph.HE
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类新星变星V704 And中的三次持续一个月的耀发

A trio of month long flares in the nova-like variable V704 And

Gabriella Zsidi, C. J. Nixon, T. Naylor, J. E. Pringle, K. L. Page

备注：
5 pages + appendix. Accepted for publication in A&A Letters
发表信息：
A&A 679, L3 (2023)
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AI总结：

本研究在类新星变星V704 And的高态中发现三次持续约一个月、缓升快降的光学耀发，结合多波段观测证实耀发由伴星质量转移率变化驱动，并探讨了相关机制。

摘要：

我们报道了在类新星变星V704 And中发现的一组不寻常的耀发事件。利用来自AAVSO（美国变星观测者协会）、ASAS-SN（全天自动超新星巡天）和ZTF（兹威基瞬变巡天）的观测数据，我们发现了三次发生在高态期间的增亮事件。这些事件使该源的光学亮度从约13.5星等提升至约12.5星等。事件持续约一个月，呈现出缓升快降的不寻常形态。就在第三次事件之后，我们获取了Swift卫星的常规监测数据，不过此时耀发已经停止，源的活动水平回到了高态下的耀发前水平。Swift的观测证实，在高态期间该源可在X射线波段被探测到，并提供了同时的紫外和光学流量数据。由于耀发发生前该源已处于高态，因此吸积盘预计已处于高黏滞状态，我们得出结论：这些光变的驱动因素必然是伴星的质量转移率变化，并讨论了发生此类短时间尺度质量转移变化的可能机制。

英文摘要：

We present the discovery of an unusual set of flares in the nova-like variable V704 And. Using data from AAVSO, ASAS-SN, and ZTF, of the nova-like variable V704 And, we have discovered a trio of brightening events that occurred during the high state. These events elevate the optical brightness of the source from $\sim13.5$ magnitude to $\sim12.5$ magnitude. The events last for roughly a month, and exhibit the unusual shape of a slow rise and faster decay. Just after the third event we obtained data from regular monitoring with Swift, although by this time the flares had ceased and the source returned to its pre-flare level of activity in the high-state. The Swift observations confirm that during the high-state the source is detectable in the X-rays, and provide simultaneous UV and optical fluxes. As the source is already in the high-state prior to the flares, and thus the disc is expected to already be in the high-viscosity state, we conclude that the driver of the variations must be changes in the mass transfer rate from the companion star and we discuss possible mechanisms for such short-timescale mass transfer variations to occur.

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