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Late Superhumps in WZ Sge-Type Dwarf Novae

机译:WZ Sge型矮新星的晚期超级驼峰

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We report on the detection of very stable modulations with periods unexpectedly (similar to 0.5%) longer than the superhump periods during the slowly fading stage of WZ Sge-type superoutbursts in three systems: GW Lib, V455 And, and WZ Sge. The periods are naturally explained by assuming that these modulations are superhumps arising from matter near the tidal truncation radius. This finding provides additional support for the hypothetical idea concerning expansion of the accretion disk well beyond the 3:1 orbital resonance in some low mass-ratio systems. Combined with the effect of a 2:1 resonance, we explain the origin of positive period derivatives in certain short-period SU UMa-type dwarf novae.
机译:我们报告了在三个系统:GW Lib,V455 And和WZ Sge中,WZ Sge型超爆发的缓慢衰落阶段中检测到的非常稳定的调制,其周期出乎意料地(类似于0.5%)长于超级驼峰周期。通过假定这些调制是潮汐截断半径附近的物质引起的超峰自然地解释了周期。这一发现为在某些低质量比的系统中有关吸积盘膨胀远超过3:1轨道共振的假设提供了额外的支持。结合2:1共振的影响,我们解释了某些短周期SU UMa型矮新星中正周期导数的起源。

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