Long-Term Variability of X-ray Binary Cyg X-1статья
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Дата последнего поиска статьи во внешних источниках: 4 сентября 2019 г.
Аннотация:As a result of our study of spectral and photometric long-term variations of V1357Cyg = Cyg X-1 on the base of the 44-year-long series of multicolor photometric and many-year-long spectro- scopic observations, it is concluded that the fundamental parameters of the supergiant in the system of Cyg X-1 continue to vary on the time scale of decades. 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 the U brightness decreases and HeI λ4713Å absorption line depth increases. And inversely - they switch off during U brightness increasing and HeI λ4713Å absorption line depth decreasing. This is may be connected with star size variations, causing outflow gas instability.