Poster abstract details

We present results of the analysis of spectroscopic time-series observations of the roAp star 33 Lib. Observations were carried out with the ESPADONS and FIES high resolution echelle spectrographs, which were carried out simultaneously with the MOST photometry. All these data were analysed for radial velocity (RV). This star differs in a pulsation behaviour from other roAp stars. Frequency analysis of the spectroscopic data shows that the highest amplitude frequency is the same in photometry and spectroscopy, while others can be seen only in the frequency spectra of RV of some REE lines. Photometric and spectroscopic pulsation curves are shifted in phase, and the phase shift depends on the atomic species. This clear difference in photometric and RV pulsational behaviour suggests the change in the pulsation characteristics with the height in the atmosphere of 33 Lib.