EDP Sciences
Free Access
Volume 418, Number 1, April IV 2004
Page(s) 295 - 303
Section Stellar structure and evolution
DOI https://doi.org/10.1051/0004-6361:20034574

A&A 418, 295-303 (2004)
DOI: 10.1051/0004-6361:20034574

p-mode frequencies in solar-like stars

I. Procyon A
M. Martic1, J.-C. Lebrun1, T. Appourchaux2 and S. G. Korzennik3

1  Service d'Aéronomie du CNRS, BP 3, 91371 Verrières le Buisson, France
2  Science Payload and Advanced Concept Office of ESA, ESTEC, AG Noordwijk, 2200, The Netherlands
3  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA-02138, USA

(Received 24 October 2003 / Accepted 27 January 2004)

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 ( $\alpha$ CMi, $\eta$ Cas A, $\zeta$ Her A and $\beta$ 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.

Key words: stars: oscillations (including pulsations) -- stars: individual: Procyon A -- techniques: radial velocities

Offprint request: M. Martic, milena@aerov.jussieu.fr

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© ESO 2004

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