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

Kato, T.; Ishioka, R.; Isogai, K.; Kimura, M.; Imada, A.; Miller, I.; Shugarov, S.Y.; Chochol, D.; Katysheva, N.; Pikalova, O.; et al.

Авторы: Kato T., Ishioka R., Isogai K., Kimura M., Imada A., Miller I., Shugarov S.Yu, Chochol D., Katysheva N., Pikalova O., et al.
Журнал: Publications of the Astronomical Society of Japan
Том: 68
Номер: 6
Год издания: 2016
Издательство: Astronomical Society of Japan
Местоположение издательства: Japan
Первая страница: 107.1
DOI: 10.1093/pasj/psw101
Аннотация: We observed RZ LMi, which is renowned for its extremely short (∼19 d) supercycle and is a member of a small, unusual class of cataclysmic variables called ER UMa-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 nova-like 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 SU UMa-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.
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RZ Leonis Minoris bridging between ER Ursae Majoris-type dwarf nova and nova-like systemстатья

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