SPECTRAL MONITORING OF THE HERBIG AE STAR HD 179218

Abstract

Some results of the spectral observations of the Herbig-type Ae star HD 179218, performed on the 2 m telescope of the ShAO of ANAS in 2015-2017, are presented. It was discovered the variation in the spectral parameters of the Hα and Hβ lines and the profiles of these lines in 2015. A wavelike variation in the parameters of the emission component of the Hα line with a characteristic time of ∼ 40 days was found. The observed wave is characterized by a significant decrease in the values of the measured line parameters; the branches of decrease and increase are more clearly expressed. At the same time, at the
moment of the minimum, the appearance and disappearance of additional blue and red emission-absorption components is observed in the profile of the Hα emission line. The same observed wave was detected in 2016, but according to 2017, only a chaotic change in the spectral parameters of these lines was observed. The variability in the spectrum of the star can be explained by the existence of the polar wind and accretion or the result of the duplicity of the system.