HIGH-RESOLUTION SPECTROSCOPIC OBSERVATIONS OF HERBIG STARS V1295 AQL. II.

Abstract

In this work we continue the spectral study of the unusual Ae Herbig star HD 190073 with pole-on orientation of the rotation axis. In the second part of spectral studies of the HD190073, we examined long-term spectral variations for 2016-2023. Using synthetic spectra of standard stars, extracted profiles of the circumstellar structure for the hydrogen and H and K CaII lines were obtained. All of these lines are show a P Cyg profile in which the deep absorption on the blue wing is highly variable. Long-term variability of
spectrophotometric parameters is detected for the lines of hydrogen, helium and other elements. On the character of the long-term variability over time, there is a general cycle of about 38-12 years. A stellar companion or massive planets may cause the reasons for such variations. Analysis of the Fourier spectrum showed a complex nature of variability. Some periods found in the spectrum and brightness are close and determined with high reliability. From short periods P2 = 4 ± 0.5 days, and from relatively long periods P3 = 97±3 days are reliably established. The fundamental parameters and evolutionary status of the star have been determined.