1996A&A...312..905M

We present a spectroscopic study of the δScuti star 20 CVn. The spectra were obtained at the Observatoire de Haute Provence with the new echelle spectrograph ELODIE. Using the correlation configuration of the instrument, an extremely precise (<0.05km/s) velocity curve has been derived. The velocity variations are sinusoidal and a fit to the data provides a peak-to-peak amplitude 2K=1.244±0.016km/s. We performed a mode identification by means of the moment method. The star is found to pulsate non-radially, and is seen at a very low inclination angle. There is ambiguity in the mode identification due to cancellation effects. Our results point towards a tesseral or a sectorial mode with |m|=2 . Our study gives preliminary evidence of the existence of a second mode, which could not be identified because of our too small data set. No phase lag is detected between the different velocity curves corresponding to different lines.