Volume 390, Number 1, July IV 2002
|Page(s)||205 - 212|
|Section||Interstellar and circumstellar matter|
|Published online||05 July 2002|
The acoustic spectrum of α Cen A*
Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Corresponding author: F. Bouchy, Francois.Bouchy@obs.unige.ch
Accepted: 7 May 2002
This paper presents the analysis of Doppler p-mode observations of the G2V star α 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 μHz. A comparison with stellar models of α Cen A is presented.
Key words: stars: individual: α Cen A / stars: oscillations
© ESO, 2002
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