Title: A multi-site campaign to measure solar-like oscillations in procyon. ii. mode frequencies
Authors: Bedding, Timothy R ×
Kjeldsen, Hans
Campante, Tiago L
Appourchaux, Thierry
Bonanno, Alfio
Chaplin, William J
Garcia, Rafael A
Martic, Milena
Mosser, Benoit
Butler, R. Paul
Bruntt, Hans
Kiss, Laszlo L
O'Toole, Simon J
Kambe, Eiji
Ando, Hiroyasu
Izumiura, Hideyuki
Sato, Bun'ei
Hartmann, Michael
Hatzes, Artie
Barban, Caroline
Berthomieu, Gabrielle
Michel, Eric
Provost, Janine
Turck-Chieze, Sylvaine
Lebrun, Jean-Claude
Schmitt, Jerome
Bertaux, Jean-Loup
Benatti, Serena
Claudi, Riccardo U
Cosentino, Rosario
Leccia, Silvio
Frandsen, Soren
Brogaard, Karsten
Glowienka, Lars
Grundahl, Frank
Stempels, Eric
Arentoft, Torben
Bazot, Michael
Christensen-Dalsgaard, Jorgen
Dall, Thomas H
Karoff, Christoffer
Lundgreen-Nielsen, Jens
Carrier, Fabien
Eggenberger, Patrick
Sosnowska, Danuta
Wittenmyer, Robert A
Endl, Michael
Metcalfe, Travis S
Hekker, Saskia
Reffert, Sabine #
Issue Date: Apr-2010
Publisher: Iop publishing ltd
Series Title: Astrophysical journal vol:713 issue:2 pages:935-949
Abstract: We have analyzed data from a multi-site campaign to observe oscillations in the F5 star Procyon. The data consist of high-precision velocities that we obtained over more than three weeks with 11 telescopes. A new method for adjusting the data weights allows us to suppress the sidelobes in the power spectrum. Stacking the power spectrum in a so-called echelle diagram reveals two clear ridges, which we identify with even and odd values of the angular degree (l = 0 and 2, and l = 1 and 3, respectively). We interpret a strong, narrow peak at 446 mu Hz that lies close to the l = 1 ridge as a mode with mixed character. We show that the frequencies of the ridge centroids and their separations are useful diagnostics for asteroseismology. In particular, variations in the large separation appear to indicate a glitch in the sound-speed profile at an acoustic depth of similar to 1000 s. We list frequencies for 55 modes extracted from the data spanning 20 radial orders, a range comparable to the best solar data, which will provide valuable constraints for theoretical models. A preliminary comparison with published models shows that the offset between observed and calculated frequencies for the radial modes is very different for Procyon than for the Sun and other cool stars. We find the mean lifetime of the modes in Procyon to be 1.29(-0.49)(+0.55) days, which is significantly shorter than the 2-4 days seen in the Sun.
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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