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Issue A&A
Volume 394, Number 1, October IV 2002
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021281



A&A 394, L5-L8 (2002)
DOI: 10.1051/0004-6361:20021281

Letter

Detection of Solar-like oscillations in the G7 giant star $\xi$ Hya

S. Frandsen1, F. Carrier2, C. Aerts3, D. Stello1, T. Maas3, M. Burnet2, H. Bruntt1, T. C. Teixeira4, 1, J. R. de Medeiros5, F. Bouchy2, H. Kjeldsen1, 6, F. Pijpers1, 6 and J. Christensen-Dalsgaard1, 6

1  Institut for Fysik og Astronomi, Aarhus Universitet, Universitetsparken, 8000 Aarhus C, Denmark
2  Observatoire de Genève, 51 chemin de Maillettes, 1290 Sauverny, Switzerland
    e-mail: fabien.carrier@obs.unige.ch
3  Katholieke Universiteit Leuven, Instituut voor Sterrenkunde, Celestijnenlaan 200 B, 3001 Leuven, Belgium
    e-mail: conny@ster.kuleuven.ac.be
4  Centro de Astrofísica da Universidade do Porto, Portugal
5  Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN, Brazil
6  Teoretisk Astrofysik Center, Danmarks Grundforskningsfond

(Received 17 June 2002 / Accepted 3 September 2002)

Abstract
We report the firm discovery of solar-like oscillations in a giant star. We monitored the star $\xi$ Hya (G7III) continuously during one month with the CORALIE spectrograph attached to the 1.2 m Swiss Euler telescope. The 433 high-precision radial-velocity measurements clearly reveal multiple oscillation frequencies in the range 50-130  $\mu$Hz, corresponding to periods between 2.0 and 5.5 hours. The amplitudes of the strongest modes are slightly smaller than $2\ensuremath{\,\rm {m\,s}^{-1}} $. Current model calculations are compatible with the detected modes.


Key words: asteroseismology -- solar type oscillations -- giant stars

Offprint request: S. Frandsen, srf@ifa.au.dk

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