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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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