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RZ Leonis Minoris bridging between ER Ursae Majoris-type dwarf nova and nova-like system

机译：在Er UrsaeMajoris和新型矮新星状系统之间架起RZ Lion小桥

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摘要

We observed RZ LMi, which is renowned for its extremely short (similar to 19 d) supercycle and is a member of a small, unusual class of cataclysmic variables called ERUMa-type dwarf novae, in 2013 and 2016. In 2016, the supercycles of this object substantially lengthened in comparison to the previous measurements to 35, 32, and 60 d for three consecutive superoutbursts. We consider that the object virtually experienced a transition to the novalike state (permanent superhumper). This observed behavior reproduced the prediction of the thermal- tidal instability model extremely well. We detected a precursor in the 2016 superoutburst and detected growing (stage A) superhumps with a mean period of 0.0602(1) d in 2016 and in 2013. Combined with the period of superhumps immediately after the superoutburst, the mass ratio is not as small as in WZ Sge-type dwarf novae, having orbital periods similar to RZ LMi. By using least absolute shrinkage and selection operator (Lasso) two-dimensional power spectra, we detected possible negative superhumps with a period of 0.05710(1) d. We estimated an orbital period of 0.05792 d, which suggests a mass ratio of 0.105(5). This relatively large mass ratio is even above that of ordinary SUUMa-type dwarf novae, and it is also possible that the exceptionally high mass-transfer rate in RZ LMi may be a result of a stripped secondary with an evolved core in a system evolving toward an AM CVn-type object.
机译：我们在2013年和2016年观察到RZ LMi，它以其极短的（类似于19天）超循环而闻名，并且是称为ERUMa型矮新星的一小类不寻常的催化变量的成员。2016年，与之前的测量结果相比，该对象对于三个连续的超级爆发基本延长了35、32和60 d。我们认为该物体实际上经历了向新星状状态的转变（永久性超强电流）。这种观察到的行为非常好地再现了潮汐不稳定性模型的预测。我们在2016年爆发过程中检测到前兆，并在2016年和2013年检测到生长的（A期）超级隆起，平均周期为0.0602（1）d。结合超级爆发后立即出现的超级隆起，质量比不小如WZ Sge型矮新星，其轨道周期类似于RZ LMi。通过使用最小绝对收缩和选择算子（Lasso）二维功率谱，我们检测到了可能的负超峰，周期为0.05710（1）d。我们估计轨道周期为0.05792 d，这表明质量比为0.105（5）。这个相对较大的质量比甚至高于普通SUUMa型矮新星的质量比，而且RZ LMi中异常高的传质速率也可能是由于在系统进化过程中剥离了具有演化核的次级分子的结果。 AM CVn类型的对象。

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