Astronomy & Astrophysics

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Issue		A&A Volume 374, Number 1, July IV 2001
Page(s)		L5 - L8
Section		Letters
DOI		10.1051/0004-6361:20010792

A&A 374, L5-L8 (2001)
DOI: 10.1051/0004-6361:20010792

P-mode observations on $\vec {\alpha}$ Cen A

F. Bouchy and F. Carrier

Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland

(Received 9 May 2001 / Accepted 5 June 2001)

Abstract
We have made a clear detection of p-mode oscillations in the nearest solar-like G2V star $\alpha$ Cen A with the CORALIE spectrograph on the 1.2-m Swiss telescope at the ESO La Silla Observatory. We report the 5 nights of observation on this star in May 2001 during which 1260 high precision radial velocity measurements were obtained. The power spectrum clearly shows several identifiable peaks between 1.7 and 3 mHz. The average large splitting of 105.7 $\mu$ Hz and the amplitude of about 35 cm s^-1 of these modes are in agreement with theoretical expectations.

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

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

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P-mode observations on Cen A

P-mode observations on $\vec {\alpha}$ Cen A