EDP Sciences
Free Access
Volume 406, Number 1, July IV 2003
Page(s) L23 - L26
Section Letters
DOI https://doi.org/10.1051/0004-6361:20030856

A&A 406, L23-L26 (2003)
DOI: 10.1051/0004-6361:20030856


Solar-like oscillations in the K1 dwarf star $\alpha$ Cen B

F. Carrier and G. Bourban

Observatoire de Genève, 51 chemin de Maillettes, 1290 Sauverny, Switzerland
(Received 12 May 2003 / Accepted 9 June 2003 )

The K1 dwarf $\alpha$ Cen B was observed with the CORALIE spectrograph on the 1.2-m Swiss telescope at La Silla in April 2003. Thirteen nights of observations have made it possible to collect 3626 radial velocity measurements with a standard deviation of 1.4 m s -1 exhibiting a mean noise level in the amplitude spectrum of only 3.75 cm s -1. Twelve oscillation modes have been identified in the power spectrum between 3 and 4.6 mHz with amplitudes in the range 8.7 to 13.7 cm s -1 and showing a regularity with a large separation of 161.1  $\mu$Hz. A preliminary discussion on the physical parameters of the $\alpha$ Cen binary system is presented.

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

Offprint request: F. Carrier, fabien.carrier@obs.unige.ch

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