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X-Ray/Optical Studies of Two Outbursts of the Intermediate Polar YY (DO) Draconisстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Szkody Paula, Nishikida Kaori, Erb Dawn, Mukai Koji, Hellier Coel, Uemura M., Kato T., Pavlenko Elena, Katysheva Nataly, Shugarov, Sergei, Cook Lew
- Журнал: Astronomical Journal
- Том: 123
- Номер: 1
- Год издания: 2002
- Издательство: American Astronomical Society
- Местоположение издательства: United States
- Первая страница: 413
- Последняя страница: 419
- DOI: 10.1086/324733
- Аннотация: YY Draconis (likely the same variable called DO Draconis) is one of a small number of intermediate polars (IPs) that show outburst behavior. We report results from Target of Opportunity observations with the Rossi X-Ray Timing Explorer, together with ground-based optical photometry during outbursts in 1999 September and 2000 November. Similar behavior was evident in both outbursts. At outburst, the X-ray flux increased by more than a factor of 12, and the spectrum became hotter and more absorbed compared to quiescence. While the spin pulse at 529 s is clearly present in the X-ray data at 2-4 days past outburst peak and during quiescence, it was not detected in the X-ray data closest to outburst (1.5 days). This is contrary to the large increase in spin pulse amplitude that has been seen during outbursts of the IPs GK Per, XY Ari, and EX Hya. The differences in YY Dra are likely due to its unique geometry, with two relatively equal poles located near the white dwarf equator. The equal enhancement of both poles near outburst could account for the low pulse amplitude, while unequal feeding of the poles as the magnetosphere recedes during decline could explain the changes in amplitude and pulse shape. The changing height of the shocks may also have an effect on the visibility of both poles.
- Добавил в систему: Катышева Наталья Андреевна