p-mode frequencies in solar-like stars. I. Procyon A

As a part of an on-going program to explore the signature of p -modes in solar-like stars by means of high-resolution absorption line spectroscopy, we have studied four stars ( α  CMi, η  Cas A, ζ  Her A and β  Vir). We present here new results from two-site observations of Procyon A acquired over twelve nights in 1999. Oscillation frequencies for $l=1$ and 0 (or 2) p -modes are detected in the power spectra of these Doppler shift measurements. A frequency analysis points out the difficulties of the classical asymptotic theory in representing the p -mode spectrum of Procyon A.

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