Superfast Line Profile Variations in the Spectra of OBA Stars III: A0 Star α2\,CVn, New Results
Abstract
This work is a continuation of the studies of the ultrafast variability of line profiles in the spectra of early-type stars. Line profile variations (LPVs) in the spectrum a chemically peculiar A0Vp star α2\,CVn are investigated using the January 6, 2020 observations carried out with the 6-meter BTA telescope at Special Astrophysical observatory (SAO) of the Russian Academy of Sciences (RAS) equipped with the MSS spectrograph. Regular short-term periodic variations of the Hβ, Fe\,II, and Cr\,II lines were detected with periods ranging from \!4 to \!140 minutes. The magnetic field of the star was determined for all observations. The average measured longitudinal magnetic field component over the entire duration of observations is about ≈600\,G, which is close to the value expected from the well-known magnetic field phase curve.