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Paper: Cyg X-1=V1357 Cyg: Long-Term Variability Continues
Volume: 510, Stars: From Collapse to Collapse
Page: 408
Authors: Karitskaya, E. A.; Bochkarev, N. G.; Goranskij, V. P.; Metlova, N. V.; Klochkova, V. G.; Yushkin, M. V.
Abstract: As a result of our multi-year study of the photometric and spectral variability of Cyg X-1, we have established that the mean level of star brightness continues to decrease since 1999 with the variations on smaller time scales superimposed. Our spectral observations with the 6 meter and 1 meter telescopes of the SAO RAS show variations of absorption line depths. There is a connection between X-ray and optical changes, which suggests that the fundamental parameters of the supergiant in the system of Cyg X-1 are varying. There are evidences of a possible presence of a variable optically thin gas in the system.
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