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Centro de Astrofísica da Universidade do Porto

Detection of Solar-like oscillations in the G7 giant star Xi Hya

S. Frandsen, F. Carrier, C. Aerts, D. Stello, T. Maas, M. Burnet, H. Bruntt, T. C. Teixeira, J. R. de Medeiros, F. Bouchy, H. Kjeldsen, F. P. Pijpers, J. Christensen-Dalsgaard

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 muHz, corresponding to periods between 2.0 and 5.5 hours. The amplitudes of the strongest modes are slightly smaller than 2 ms. Current model calculations are compatible with the detected modes. Based on observations obtained with the CORALIE spectrograph on the 1.2-m Swiss Euler telescope at La Silla, Chile.

Astronomy and Astrophysics
Volume 394, Page L5
October 2002

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