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Issue A&A
Volume 378, Number 1, October IV 2001
Page(s) 142 - 145
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011131



A&A 378, 142-145 (2001)
DOI: 10.1051/0004-6361:20011131

Solar-like oscillations in $\vec{\beta}$ Hydri: Confirmation of a stellar origin for the excess power

F. Carrier1, F. Bouchy1, F. Kienzle1, T. R. Bedding2, H. Kjeldsen3, R. P. Butler4, I. K. Baldry5, S. J. O'Toole2, C. G. Tinney5 and G. W. Marcy6, 7

1  Observatoire de Genève, 1290 Sauverny, Switzerland
2  School of Physics A28, University of Sydney, NSW 2006, Australia
3  Theoretical Astrophysics Center, University of Aarhus, 8000 Aarhus C, Denmark
4  Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road NW, Washington, DC 20015-1305, USA
5  Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia
6  Department of Astronomy, University of California, Berkeley, CA 94720, USA
7  Department of Physics and Astronomy, San Francisco, CA 94132, USA

(Received 14 March 2001 / Accepted 10 August 2001 )

Abstract
The G2 subgiant $\beta$ Hyi (HR 98) was observed with the CORALIE fiber-fed echelle spectrograph on the 1.2-m Swiss telescope at La Silla in June 2000. The resulting 971 high-accuracy radial velocities exhibit an rms scatter of 2.72 m s-1 and a mean noise level in the amplitude spectrum of 0.122 m s-1. These measurements show significant excess in the power spectrum between 0.7-1.4 mHz with 0.40 m s-1 peak amplitude. Fitting the asymptotic relation to the power spectrum gives a large splitting of 58 $\mu$Hz which is in good agreement with theoretical expectations. Our data confirm the independent detection of solar-like oscillations in $\beta$ Hyi announced by Bedding et al. (2001) which used the UCLES echelle spectrograph on the 3.9-m Anglo-Australian Telescope. Two independent instruments and calibration methods obtained very similar power excesses thus leaving little doubts on the stellar origin of the detected signal.


Key words: stars: oscillations -- stars: individual: $\beta$ Hydri -- techniques: radial velocities

Offprint request: F. Carrier, Fabien.Carrier@obs.unige.ch

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