  We present results of the radial velocity (RV) analysis of spectroscopic
time-series observations of the roAp star HD24712 (HR1217) which were carried
out simultaneously with the Canadian MOST mini-satellite photometry. Only lines
of the rare-earth elements (REE) show substantial amplitudes of RV pulsations.
Based on new Zeeman measurements we found different shapes of the magnetic
curves derived by using Fe-peak and REE separately. Frequency analysis of the
spectroscopic data showed that the highest amplitude frequencies are the same
in photometry and spectroscopy. Photometric and spectroscopic pulsation curves
are shifted in phase, and the phase shift depends on the atomic species. The
observed distribution of RV pulsation amplitudes and phases with the optical
depth as well as the observed phase lag between luminosity and radius
variations are explained satisfactorily by the model of nonadiabatic nonradial
pulsations of a magnetic star.
