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We describe the version of the Temporal Variance Spectrum (TVS, Fullerton,Gies & Bolton 1996) method with pre-smoothed line profile (smoothed TemporalVariance Spectrum, smTVS). This method introduced by Kholtygin et al. (2003)can be used to detect the ultra weak variations of the line profile even forvery noisy stellar spectra. We also describe how to estimate the mode of thenon-radial pulsations (NRP) using the TVS and smTVS with different time spans.The influence of the rotational modulation of the line profile on the TVS isconsidered. The analysis of the contribution of NRP and rotational modulationin the global TVS is studied.

Smoothed Temporal Variance Spectrum: weak line profile variations and NRP diagnostics