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On the long-term variability of high massive X-ray binary Cyg X-1. High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objectsстатья
Информация о цитировании статьи получена из
Scopus
Дата последнего поиска статьи во внешних источниках: 7 июля 2020 г.
- Авторы: Karitskaya Eugenia, Bochkarev Nikolai, Goranskij Vitalij, Metlova Natalia
- Сборник: Proceedings of the International Astronomical Union
- Том: 346
- Глава в коллективной монографии
- Год издания: 2019
- Место издания: Cambridge University Press (CUP)
- Первая страница: 206
- Последняя страница: 211
- DOI: 10.1017/S1743921319001339
- Аннотация: We continue our study of spectral and photometric variability of Cyg X-1 on the basis of the 45-year long series of multicolor photometric observations and many-year-long series of spectral observations we have accumulated up to now. The mean level of star brightness continues to decrease since 1999 with the variations on smaller time scales superimposed. There is a connection between X-ray and optical changes. The chaotic variations of X-ray flux sometimes reaching to “hard” - “soft” state irregular changes switch on when U brightness decrease and He I λ 4713 Å absorption line depth increase. And inversely - they switch off during U brightness increasing and He I λ 4713 Å absorption line depth decreasing. This may be connected with star size variations, causing outflow gas instability. It is concluded that the fundamental parameters of the supergiant in the system of Cyg X-1 continue to vary on the time scales of years - decades.
- Добавил в систему: Бочкарев Николай Геннадиевич