The acoustic spectrum of alpha Cen A

Details The acoustic spectrum of alpha Cen A The acoustic spectrum of alpha Cen A

2002-06-04

arxiv.org/abs/astro-ph/0206051v1

Astronomy and Astrophysics

Astrophysics

9 pages, 12 figures, A&A accepted

Scientific paper

10.1051/0004-6361:20020706

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.

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