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- Title
V1006 Cygni: Dwarf nova showing three types of outbursts and simulating some features of the WZ Sge-type behavior.
- Authors
Taichi KATO; PAVLENKO, Elena P.; SHCHUROVA, Alisa V.; SOSNOVSKIJ, Aleksei A.; BABINA, Julia V.; BAKLANOV, Aleksei V.; SHUGAROV, Sergey Yu.; LITTLEFIELD, Colin; DUBOVSKY, Pavol A.; KUDZEJ, Igor; PICKARD, Roger D.; Keisuke ISOGAI; Mariko KIMURA; de MIGUEL, Enrique; Tamás TORDAI; CHOCHOL, Drahomir; Yutaka MAEDA; COOK, Lewis M.; MILLER, Ian; Hiroshi ITOH
- Abstract
We observed the 2015 July-August long outburst of V1006 Cyg and established this object to be an SUUMa-type dwarf nova in the period gap. Our observations have confirmed that V1006 Cyg is the second established object showing three types of outbursts (normal, long normal, and superoutbursts) after TUMen. We have succeeded in recording the growing stage of superhumps (stage A superhumps) and obtained a mass ratio of 0.26-0.33, which is close to the stability limit of tidal instability. This identification of stage A superhumps demonstrates that superhumps indeed slowly grow in systems near the stability limit, the idea first introduced by Kato et al. (2014, PASJ, 66, 90). The superoutburst showed a temporary dip followed by a rebrightening. The moment of the dip coincided with the stage transition of superhumps, and we suggest that stage C superhumps are related to the start of the cooling wave in the accretion disk. We interpret that the tidal instability was not strong enough to maintain the disk in the hot state when the cooling wave started. We propose that the properties commonly seen in the extreme ends of mass ratios (WZ Sge-type objects and long-period systems) can be understood as a result of weak tidal effect.
- Subjects
ACCRETION (Astrophysics); ACCRETION disks; NOVAE (Astronomy); DWARF novae; STARS
- Publication
Publications of the Astronomical Society of Japan, 2016, Vol 68, Issue 2, pL4-1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psv138