Long-term spectral monitoring of the high-luminosity stars in the Cas OB5 association

Abstract

We report our first results of the spectroscopy of the supergiants HD 223960 (A0.1 Ia) and HD 225094 (B2.9 Iab), which are members of the Cas OB5 association. Our study is based on the long-term spectroscopy of BA-type supergiants. The high-resolution echelle spectra were obtained in 2017 — 2021 with the 6 meter telescope of the Special Astrophysical Observatory using echelle spectrograph NES. We provided an analysis of the velocity field in the stellar atmospheres and in the circumstellar medium, and found the profile variability of the HI and HeI lines and multicomponent structure of interstellar NaI and KI lines. The Multifaceted Universe: