SIMBAD references

Five consecutive nights of high resolution spectroscopic observations of the δ Scuti star FG Vir allowed us to analyze the radial velocity and line profile variations induced by non-radial multi-mode pulsations. Ten modes were detected. All of them have a photometric counterpart (Breger et al., 1998A&A...331..271B). Preliminary identifications have been performed by means of the simultaneous fit of line-profile and light variations. Most of these modes have an axisymmetric character (m=0), one is retrograde (9.20c/d, m=1) and one is prograde with a relatively high order (21.55c/d, l=3, m=-1). The more accurate results regard the dominant mode (12.72c/d) which is axisymmetric with l=1. In this case we were able to obtain reliable estimates of its physical characteristics. The analysis of our data tends to support the idea that the stellar rotation axis probably has a rather low inclination (about 15°): this is probably the reason for the high number of observed axisymmetric modes. Hence, since the measured vsin i is 20.7km/s, we deduce that the rotation velocity should be around 80km/s and the rotational period about 1.5d.