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

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arxiv astro-ph/0703747 v2 pith:7D7Z2GL4 submitted 2007-03-29 astro-ph

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

Timothy R. Bedding , Hans Kjeldsen , Torben Arentoft , Francois Bouchy , Jacob Brandbyge , Brendon J. Brewer , R. Paul Butler , Joergen Christensen-Dalsgaard
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Thomas Dall Soeren Frandsen Christoffer Karoff Laszlo L. Kiss Mario J.P.F.G. Monteiro Frank P. Pijpers Teresa C. Teixeira C. G. Tinney Ivan K. Baldry Fabien Carrier Simon J. O'Toole
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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. 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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  1. Asteroseismology of solar-type stars

    astro-ph.SR 2019-06 unverdicted novelty 2.0

    This review summarizes the development, techniques, and open questions in asteroseismology of solar-type stars whose oscillations are stochastically excited by surface convection.