Detection of Solar-like Oscillations in the G7 Giant Star xi Hya

Details Detection of Solar-like Oscillations in the G7 Giant Star xi Hya Detection of Solar-like Oscillations in the G7 Giant Star xi Hya

2002-09-17

arxiv.org/abs/astro-ph/0209325v1

Astron.Astrophys. 394 (2002) L5-L8

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, accepted for publication as a letter in A&A

Scientific paper

10.1051/0004-6361:20021281

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 1.2m Swiss Euler telescope. The 433 high-precision radial-velocity measurements clearly reveal multiple oscillation frequencies in the range 50 - 130 uHz, corresponding to periods between 2.0 and 5.5 hours. The amplitudes of the strongest modes are slightly smaller than 2 m/s. Current model calculations are compatible with the detected modes.

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