Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. III. The Third Year (2010–2011)
Year: 2012
Type: article
Abstract: Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected the times of superhump maxima for 51 SU UMa-type dwarf novae, mainly observed during the 2010–2011 season. Although most of the new data for systems with short superhump periods basically confirmed the findings by Kato et al. (ibid.) and Kato et al. (2010, PASJ, 62, 1525), the long-period system GX Cas showed an exceptionally large positive-period derivative. An analysis of public Kepler data of V344 Lyr and V1504 Cyg yielded less-striking stage transitions. In V344 Lyr, there was a prominent secondary component growing during the late stage of superoutbursts, and this component persisted for at least two more cycles of successive normal outbursts. We also investigated the superoutburst of two conspicuous eclipsing objects: HT Cas and the WZ Sge-type object SDSS J080434.20$+$510349.2. Strong beat phenomena were detected in both objects, and late-stage superhumps in the latter object had an almost constant luminosity during repeated rebrightenings. The WZ Sge-type object SDSS J133941.11$+$484727.5 showed a phase reversal around the rapid fading from the superoutburst. The object showed a prominent beat phenomenon, even after the end of the superoutburst. A pilot study of superhump amplitudes indicated that the amplitude of superhumps is strongly correlated with the orbital period, and the dependence on the inclination is weak in systems with inclinations smaller than 80$^{\circ}$.
DOI: 10.1093/pasj/64.1.21
Authors: Taichi Kato, Hiroyuki Maehara, Ian Miller, Tomohito Ohshima, Enrique de Miguel, Kenji Tanabe, Kazuyoshi Imamura, Hidehiko Akazawa, Nanae Kunitomi, Ryosuke Takagi, Mikiha Nose, Franz-Josef Hambsch, Seiichiro Kiyota, Elena P. Pavlenko, Aleksei V. Baklanov, Oksana I. Antonyuk, Denis Samsonov, Aleksei Sosnovskij, Kirill Antonyuk, Maksim V. Andreev, Etienne Morelle, Pavol A. Dubovsky, Igor Kudzej, Arto Oksanen, Gianluca Masi, Thomas Krajci, Roger D. Pickard, Richard Sabo, Hiroshi Itoh, William Stein, Shawn Dvorak, Arne Henden, Shinichi Nakagawa, Ryo Noguchi, Eriko Iino, Katsura Matsumoto, Hiroki Nishitani, Tomoya Aoki, Hiroshi Kobayashi, Chihiro Akasaka, Greg Bolt, Jeremy Shears, Javier Ruiz, Sergey Yu. Shugarov, Drahomir Chochol, Nikolai A. Parakhin, Berto Monard, Kazuhiko Shiokawa, Kiyoshi Kasai, Bart Staels, Atsushi Miyashita, Donn R. Starkey, Yenal Ögmen, Colin Littlefield, Natalia Katysheva, Ivan M. Sergey, Denis Denisenko, Tamas Tordai, Robert Fidrich, Vitaly P. Goranskij, Jani Virtanen, Tim Crawford, Jochen Pietz, Robert A. Koff, David Boyd, Steve Brady, Nick James, William N. Goff, Koh-ichi Itagaki, Hideo Nishimura, Youichirou Nakashima, Seiichi Yoshida, Rod Stubbings, Gary Poyner, Yutaka Maeda, Stanislav A. Korotkiy, Kirill V. Sokolovsky, Seiji Ueda
Institutions: Kyoto University, Universidad de Huelva, Okayama University of Science, Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne, Variable Star Observers League in Japan, Crimean Astrophysical Observatory, Russian Academy of Sciences, International Center for Astronomical, Medical and Ecological Research, Vihorlat Observatory, British Astronomical Association, Climat, Environnement, Couplages et Incertitudes, American Association of Variable Star Observers, Osaka Kyoiku University, Lomonosov Moscow State University, Slovak Academy of Sciences, Astronomical Institute of the Slovak Academy of Sciences, Bronberg Observatory, University of Notre Dame, Space Research Institute, Hungarian Astronomical Association, Antelope Hills Observatory, National Astronomical Observatory of Japan, Tetoora Road Observatory, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Astro Space Center, Max Planck Institute for Radio Astronomy
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2595569306