Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations

Details Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations

2007-03-29

arxiv.org/abs/astro-ph/0703747v2

Astrophys.J.663:1315-1324,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 14 figures, accepted by ApJ. Fixed minor typo (ref to Fig 14)

Scientific paper

10.1086/518593

We have observed oscillations in the nearby G2 subgiant star beta Hyi using high-precision velocity observations obtained over more than a week with the HARPS and UCLES spectrographs. The oscillation frequencies show a regular comb structure, as expected for solar-like oscillations, but with several l=1 modes being strongly affected by avoided crossings. The data, combined with those we obtained five years earlier, allow us to identify 28 oscillation modes. By scaling the large frequency separation from the Sun, we measure the mean density of beta Hyi to an accuracy of 0.6%. The amplitudes of the oscillations are about 2.5 times solar and the mode lifetime is 2.3 d. A detailed comparison of the mixed l=1 modes with theoretical models should allow a precise estimate of the age of the star.

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