Discovery of Standstills in the SU UMa-Type Dwarf Nova NY Serpentis

16 Jan 2019  ·  Kato Taichi Kyoto U, Pavlenko Elena P., Pit Nikolaj V., Antonyuk Kirill A., Antonyuk Oksana I., Babina Julia V., Baklanov Aleksei V., Sosnovskij Aleksei A., Belan Sergey P., Maeda Yutaka, Sugiura Yuki, Sumiya Sho, Matsumoto Hanami, Ito Daiki, Nikai Kengo, Kojiguchi Naoto, Matsumoto Katsura, Dubovsky Pavol A., Kudzej Igor, Medulka Tomas, Wakamatsu Yasuyuki, Ohnishi Ryuhei, Seki Takaaki, Isogai Keisuke, Simon Andrii O., Romanjuk Yaroslav O., Baransky Alexsandr R., Sergeev Aleksandr V., Godunova Vira G., Izviekova Inna O., Kozlov Volodymyr A., Sklyanov Aleksandr S., Zhuchkov Roman Ya., Gutaev Alexei G., Ponomarenko Vasyl O., Vasylenko Volodymyr V., Miller Ian, Kasai Kiyoshi, Dvorak Shawn, Menzies Kenneth, de Miguel Enrique, Brincat Stephen M., Pickard Roger D. ·

We found that the SU UMa-type dwarf nova NY Ser in the period gap [orbital period 0.097558(6) d] showed standstills twice in 2018. This is the first clear demonstration of a standstill occurring between superoutbursts of an SU UMa-type dwarf nova... There was no sign of superhumps during the standstill, and at least one superoutburst directly started from the standstill. This provides strong evidence that the 3:1 resonance was excited during standstills. This phenomenon indicates that the disk radius can grow during standstills. We also interpret that the condition close to the limit of the tidal instability caused early quenching of superoutbursts, which resulted substantial amount of matter left in the disk after the superoutburst. We interpret that the substantial matter in the disk in condition close to the limit of the tidal instability is responsible for standstills (as in the high mass-transfer system NY Ser) or multiple rebrightenings (as in the low mass-transfer system V1006 Cyg). read more

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Solar and Stellar Astrophysics