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Identification with H1705-25 (Nova Oph 1977) and the spectral evolution of the periodic 152-h source detected in the Prognoz 9 X-ray experimentстатья
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: Kudryavtsev M.I., Svertilov S.I., Bogomolov V.V.
- Журнал: Astronomy Letters
- Том: 22
- Номер: 6
- Год издания: 1996
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 804
- Последняя страница: 810
- Аннотация: Among the periodic processes with periods of the order of one day, observed in the Galactic-center region during an X-ray experiment on the Prognoz-9 satellite between November 1983 and January 1984, the 152-h periodicity with an extremely hard spectrum stands out as the most intense process in the 50 to 200 keV energy band. Estimates for the angular position of the source with which the 152-h periodicity is associated and a combined analysis of the time properties of the light curves obtained in this experiment and from the HEAO-1 observations of the hard X-ray transient H1705-25 (Nova Ophiuchi 1977) show that this periodicity can be identified with H1705-25. Evidence for the presence of a 167-h periodicity in the X-ray emission from H1705-25 during a transient flux increase in 1977 suggests a possible period drift of similar to 2% per year. The spectral evolution of the periodic component is characterized (in power-law representation) by a change in the power-law index gamma along the phase curve from similar to 2.0 to similar to 1.4.
- Добавил в систему: Свертилов Сергей Игоревич