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X-ray Spectra and Light Curves of Cooling Novae and a Nova-Likeстатья
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: 8 января 2021 г.
- Авторы: Bangzheng Sun, Orio Marina, Dobrotka Andrej, Luna Gerardo Juan Manuel, Shugarov Sergey, Zemko Polina
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 499
- Год издания: 2020
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 3006
- Последняя страница: 3018
- DOI: 10.1093/mnras/staa3012
- Аннотация: We present X-ray observations of novae V2491 Cyg and KT Eri about 9 years post-outburst, of the dwarf nova and post-nova candidate EY Cyg, and of a VY Scl variable. The first three objects were observed with XMM-Newton, KT Eri also with the Chandra ACIS-S camera, V794 Aql with the Chandra ACIS-S camera and High Energy Transmission Gratings. The two recent novae, similar in outburst amplitude and light curve, appear very different at quiescence. Assuming half of the gravitational energy is irradiated in X-rays, V2491 Cyg is accreting at m˙=1.4×10−9−10−8M⊙/yr , while for KT Eri, m˙<2×10−10M⊙/yr . V2491 Cyg shows signatures of a magnetized WD, specifically of an intermediate polar. A periodicity of 39 minutes, detected in outburst, was still measured and is likely due to WD rotation. EY Cyg is accreting at m˙∼1.8×10−11M⊙/yr , one magnitude lower than KT Eri, consistently with its U Gem outburst behavior and its quiescent UV flux. The X-rays are modulated with the orbital period, despite the system's low inclination, probably due to the X-ray flux of the secondary. A period of 81 minutes is also detected, suggesting that it may also be an intermediate polar. V794 Aql had low X-ray luminosity during an optically high state, about the same level as in a recent optically low state. Thus, we find no clear correlation between optical and X-ray luminosity: the accretion rate seems unstable and variable. The very hard X-ray spectrum indicates a massive WD.
- Добавил в систему: Шугаров Сергей Юрьевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | MNRAS-2020-499-3006.pdf | 1,9 МБ | 29 октября 2020 [s_shugarov] |