A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies

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 échelle 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 μHz 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 ~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 days, which is significantly shorter than the 2-4 days seen in the Sun.

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An edited version of this paper was published by The American Astronomical Society. Copyright 2010 The American Astronomical Society.
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Author Bedding, Timothy
Kjeldsen, Hans
Campante, Tiago
Appourchaux, Thierry
Bonanno, Alfio
Chaplin, William
Garcia, Rafael
Martic, Milena
Mosser, Benoit
Butler, R.
Bruntt, Hans
Kiss, László
O'Toole, Simon
Kambe, Eiji
Ando, Hiroyasu
Izumiura, Hideyuki
Sato, Bun'ei
Hartman, Michael
Hatzes, Artie
Barban, Caroline
Berthomieu, Gabrielle
Michel, Eric
Provost, Janine
Turck-Chièze, Sylvaine
Lebrun, Jean-Claude
Schmitt, Jerome
Bertaux, Jean-Loup
Benatti, Serena
Claudi, Riccardo
Cosentino, Rosario
Leccia, Silvio
Frandsen, Søren
Brogaard, Karsten
Glowienka, Lars
Grundahl, Frank
Stempels, Eric
Arentoft, Torben
Bazot, Michaël
Christensen-Dalsgaard, Jørgen
Dall, Thomas
Karoff, Christoffer
Lundgreen-Nielsen, Jens
Carrier, Fabien
Eggenberger, Patrick
Sosnowska, Danuta
Wittenmyer, Robert
Endl, Michael
Metcalfe, Travis
Hekker, Saskia
Reffert, Sabine
Publisher UCAR/NCAR - Library
Publication Date 2010-04-20T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:48:57.905488
Metadata Record Identifier edu.ucar.opensky::articles:10467
Metadata Language eng; USA
Suggested Citation Bedding, Timothy, Kjeldsen, Hans, Campante, Tiago, Appourchaux, Thierry, Bonanno, Alfio, Chaplin, William, Garcia, Rafael, Martic, Milena, Mosser, Benoit, Butler, R., Bruntt, Hans, Kiss, László, O'Toole, Simon, Kambe, Eiji, Ando, Hiroyasu, Izumiura, Hideyuki, Sato, Bun'ei, Hartman, Michael, Hatzes, Artie, Barban, Caroline, Berthomieu, Gabrielle, Michel, Eric, Provost, Janine, Turck-Chièze, Sylvaine, Lebrun, Jean-Claude, Schmitt, Jerome, Bertaux, Jean-Loup, Benatti, Serena, Claudi, Riccardo, Cosentino, Rosario, Leccia, Silvio, Frandsen, Søren, Brogaard, Karsten, Glowienka, Lars, Grundahl, Frank, Stempels, Eric, Arentoft, Torben, Bazot, Michaël, Christensen-Dalsgaard, Jørgen, Dall, Thomas, Karoff, Christoffer, Lundgreen-Nielsen, Jens, Carrier, Fabien, Eggenberger, Patrick, Sosnowska, Danuta, Wittenmyer, Robert, Endl, Michael, Metcalfe, Travis, Hekker, Saskia, Reffert, Sabine. (2010). A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7st7q9x. Accessed 24 June 2025.

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