EDP Sciences
Free Access
Volume 390, Number 1, July IV 2002
Page(s) 205 - 212
Section Formation, structure and evolution of stars
DOI https://doi.org/10.1051/0004-6361:20020706

A&A 390, 205-212 (2002)
DOI: 10.1051/0004-6361:20020706

The acoustic spectrum of $\alpha$ Cen A

F. Bouchy and F. Carrier

Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland

(Received 17 January 2002 / Accepted 7 May 2002)

This paper presents the analysis of Doppler p-mode observations of the G2V star $\alpha$ Cen A obtained with the spectrograph CORALIE in May 2001. Thirteen nights of observations have made it possible to collect 1850 radial velocity measurements with a standard deviation of about 1.5 m s -1. Twenty-eight oscillation modes have been identified in the power spectrum between 1.8 and 2.9 mHz with amplitudes in the range 12 to 44 cm s -1. The average large and small spacing are respectively equal to 105.5 and 5.6  $\mu$Hz. A comparison with stellar models of $\alpha$ Cen A is presented.

Key words: stars: individual: $\alpha$ Cen A -- stars: oscillations

Offprint request: F. Bouchy, Francois.Bouchy@obs.unige.ch

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© ESO 2002

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