Journal
ASTROPHYSICAL JOURNAL
Volume 663, Issue 2, Pages 1315-1324Publisher
IOP PUBLISHING LTD
DOI: 10.1086/518593
Keywords
stars : individual (beta Hydri); stars : oscillations
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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. These 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 days. 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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