Title: Solar-like oscillations in the G2 subgiant beta hydri from dual-site observations
Authors: Bedding, Timothy R ×
Kjeldsen, Hans
Arentoft, Torben
Bouchy, Francois
Brandbyge, Jacob
Brewer, Brendon J
Butler, R. Paul
Christensen-Dalsgaard, Jorgen
Dall, Thomas
Frandsen, Soren
Karoff, Christoffer
Kiss, Laszlo L
Monteiro, Mario J. P. F. G
Pijpers, Frank P
Teixeira, Teresa C
Tinney, C. G
Baldry, Ivan K
Carrier, Fabien
O'Toole, Simon J #
Issue Date: Jul-2007
Publisher: Univ chicago press
Series Title: Astrophysical journal vol:663 issue:2 pages:1315-1324
Abstract: 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.
ISSN: 0004-637X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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