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We present the analysis of spectroscopic time-series observations of the roApstar 10 Aql. Observations were carried out in July 2006 with the UVES and SARGspectrographs simultaneously with the MOST mini-satellite photometry. All thesedata were analysed for radial velocity (RV) variations. About 150 lines out ofthe 1000 measured reveal clear pulsation signal. Frequency analysis of thespectroscopic data gives four frequencies. Three highest amplitude frequenciesin spectroscopy coincide with the photometric ones. Phase-amplitude diagramscreated for the lines of different elements/ions show that atmosphericpulsations may be represented by a superposition of the standing and runningwave components, similar to other roAp stars. The highest RV amplitudes,300-400 m/s, were measured for Ce II, Dy III, Tb III, and two unidentifiedlines at lambda 5471, 5556 A. We discovered ~0.4 period phase jump in the RVmeasurements across the Nd III line profiles. It indicates the presence of thepulsation node in stellar atmosphere. The phase jump occurs at nearly the sameatmospheric layers for the two main frequencies. There is no rotationalmodulation in the average spectra for the 6 different nights we analysed.

Spectroscopic study of pulsations in the atmosphere of roAp star 10 Aql