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Discovery of a WZ Sge-Type Dwarf Nova, SDSS J102146.44+234926.3: Unprecedented Infrared Activity during a Rebrightening Phaseстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Uemura M., Arai A., Krajci T., Pavlenko E., Shugarov S., Katysheva N., Goranskij V., Maehara H., Imada A., Kato T., Nogami D., Nakajima K., Ohsugi T., Yamashita Takuya, Kawabata Koji S., Nagae O.
- Журнал: Publications of the Astronomical Society of Japan
- Том: 60
- Номер: 2
- Год издания: 2008
- Издательство: Astronomical Society of Japan
- Местоположение издательства: Japan
- Первая страница: 227
- Последняя страница: 236
- Аннотация: Several SU UMa-type dwarf novae and WZ Sge-type stars tend to exhibit rebrightenings after superoutbursts. The rebrightening phenomenon is problematic for the disk instability theory of dwarf novae, since it requires a large amount of remnant matter in the disk, even after superoutbursts. Here, we report on our optical and infrared observations during the first-ever outburst of a new dwarf nova, SDSS J102146.44+234926.3. During the outburst, we detected superhumps with a period of 0.056281±0.000015d, which is typical for superhump periods in WZ Sge stars. In conjunction with the appearance of a long-lived rebrightening, we concluded that the object is a new member of WZ Sge stars. Our observations, furthermore, revealed infrared behaviors for the first time in the rebrightening phase of WZ Sge stars. We discovered prominent infrared superhumps. We calculated the color temperature of the infrared superhump source to be 4600-6400K. These temperatures are too low to be explained by a fully ionized disk appearing during dwarf-nova outbursts. We also found a Ks-band excess over the hot disk component. These unprecedented infrared activities provide evidence for the presence of mass reservoir at the outermost part of the accretion disk. We propose that a moderately high mass-accretion rate at this infrared active region leads to the long-lived rebrightening observed in SDSS J102146.44+234926.3.
- Добавил в систему: Катышева Наталья Андреевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | pasj2008.pdf | 815,7 КБ | 3 марта 2015 [s_shugarov] |