NON-STATIONARY PROCESSES IN THE ATMOSPHERE OF THE SUPERGIANT HD 208501 (B8 IB)

Abstract

By using the spectrograms obtained at the 2-m telescope of the Shamakhy Astrophysical Observatory for the period of 2013±2018 the variation of a profile and spectral parameters of Hα and of the sodium NaI D lines of the supergiant HD208501 have been investigated. It was revealed that in the spectrum of this star, the radial velocity and the equivalent width of the absorption component of the Hα and of the sodium NaI D lines vary with timethese variations occur in antiphase.It was proposed that the antiphase variation of radial velocity and the equivalent width of the absorption component Hα and sodium NaI D lines could be connected with the pulsation of this star and with the interaction star and its shell.