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arXiv 1504.00469astro-ph.SR
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SU Uma星:超爆发后的再亮

SU Uma stars: Rebrightenings after superoutburst

Friedrich Meyer, Emmi Meyer-Hofmeister

摘要:

SU Uma恒星在长时间的超爆发后,通常会出现一次或多次的再亮。我们展示了这种现象如何可以被理解为反复反射的过渡波调解之间的变化热和冷状态的吸积盘和来回旅行的外盘区域,留下一个内部永久热。这表明粘度暂时增加,可能与在长时间超级爆发期间发电机操作形成大规模和持续时间更长的磁场有关。Kato和Osaki在开普勒观测中发现的V585天琴座爆发后早期光变曲线中的“微小再亮”似乎可以理解为低光度变化的小极限环,其起源于冷光学厚盘的热平衡曲线中的摆动特征。

英文摘要:

SU Uma stars after their long superoutbursts often show single or multiple rebrightenings. We show how this phenomenon can be understood as repeated reflections of transition waves which mediate changes between the hot and the cool state of the accretion disk and travel back and forth in the outer disk region, leaving an inner part permanently hot. This points to a temporarily increased viscosity, possibly related to the formation of large-scale and longer persisting magnetic fields by the dynamo operation during the long superoutburst. The 'mini-rebrightenings' in the early post-outburst light curve of V585 Lyr discovered by Kato and Osaki in Kepler observations seem to be understandable as a small limit cycle of low luminosity changes originating from a wiggle-feature in the thermal equilibrium curve of the cool optically thick disk.

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