NON-STATIONARY PROCESSES IN THE ATMOSPHERE OF THE SUPERGIANT HD 190603 (B1.5IA)

Abstract

By using the spectrograms obtained at the 2-m telescope of the Shamakhy Astrophysical Observatory for the period of 2010÷2019 the variation of a profile and spectral parameters of Hα and Hβ lines of the supergiant HD190603 have been investigated. It was found that the profiles, radial velocities and equivalent widths of the Hα and Hβ lines in the spectrum of the supergiant star HD190603 vary in time. The Hα line profile consists of an absorption and an emission component. The emission component, depending on time, consists of one, two or three components. It was assumed the absorption and emission components radial
velocity and equivalent width of the Hα and Hβ line vary in time with a quasi-period approximately of 100 - 120 days.