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A 10-night asteroseismic observation programme has been conducted in January2004 with the spectrometer Harps at the ES0 3.6-m telescope. The selectedtarget, the 6th magnitude F5V star HD 49933, was chosen among the primecandidates of Corot, the European space mission dedicated to characterizestellar oscillations mode with high precision photometry measurements. Thisstar shows important line profiles variations, indicating a surprisingly highactivity with respect to its low rotation rate. However, with the help of toolsdeveloped for disentangling the signatures of activity and oscillations, we areable to observe its oscillation spectrum in the frequency range [1.2, 2.2 mHz].We measure the large separation (88.7+-0.4 microHz) and the maximum amplitude(around 0.4+-0.1 m/s rms), respectively in agreement and marginal agreementwith the predicted values.Comment: accepted in A&A Letter

Seismology and activity of the F type star HD 49933