ACTIVE STAGE OF THE SYMBIOTIC STAR CH CYG IN 2015

Symbiotic star CH Cyg is very different from other members of this group by the behavior of its photometric and spectral parameters. CH Cyg also belongs to a small subgroup of symbiotic stars in spectra where the high velocity absorption components have been observed – so called “Jet Absorption Structures” in the Hydrogen lines from the Balmer series. In this paper, the behavior of these jet absorption structures in Hα and Hβ lines in the spectrum of the symbiotic star CH Cyg during 18 nights from July to September of the year 2015 is described. Spectra has been obtained at the Cassegrain focus of the 2-meter telescope at Shamakhy Astrophysical Observatory with the help of echelle spectrograph with spectral resolution of R = 14 000. This paper also provides the profiles of the Hα and Hβ lines with absorption components on the blue wing. Based on the depth and the appearance, the absorption components have changed significantly and the short wavelength boundary reaches velocities of near 2500 km/s. The depth of absorption component on Hα is considerably less than the one at Hβ.