Pulsational and rotational line profile variations of the roAp stars α Cir and HR 3831

We report preliminary results of our new time-resolved high-resolution spectroscopic observations of the roAp stars alpha Cir and HR 3831. Analysis of pulsational behaviour of individual spectral lines in the 6116-6156 Angstrom spectral region revealed that in both stars it is dominated by the strong rapid variations of the Nd iii 6145.07 Angstrom spectral line. Oscillations of the Nd iii spectral feature are also rotationally modulated. In addition we observed strong rotational modulation of the average HR 3831 line profiles caused by abundance spots on the stellar surface. Weaker rotational modulation was also discovered for the metal lines in the alpha Cir spectrum. This variability agrees with the rotational period of alpha Cir obtained from the splitting of the principal pulsation frequency.