Abstract—This study continues the investigation of the super-fast variability of line profiles in the spectra of stars of early spectral classes performed in 2017 and 2018. We investigated the variability of line profiles in the spectra of OBA stars with the SCORPIO multi-mode focal reducer at the 6-m SAO RAS telescope (BTA). Short-period regular variations of the H and He lines were detected in the spectra of the chemically peculiar A0Vp star α² CVn with periods ranging from approximately 30 to 135 minutes. Using the windowed Fourier transform let us detect the transient quasi-regular variations in the Balmer-line profiles with periods of 3–6 minutes. We discuss a possible origin of fast spectral variations.