Solar-like oscillations in the F9 V β Virginis

This paper presents the analysis of Doppler p-modes of the F9 V star β Virginis obtained with the spectrograph Coralie in March 2003. Eleven nights of observations have made it possible to collect 1293 radial velocity measurements with a standard deviation of about 2.2 ms−1. The power spectrum of the high precision velocity time series clearly presents several identifiable peaks between 0.7 and 2.4 mHz showing regularity with a large and small spacings of Δν = 72.1 μHz and δν02 = 6.3 μHz, respectively. Thirty-one individual modes have been identified with amplitudes in the range 23-46 cm s−1, i.e., with a signal to noise between 3 and 6.