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

Timothy R. Bedding, Hans Kjeldsen, Tiago L. Campante, Thierry Appourchaux, Alfio Bonanno, William J. Chaplin, Rafael A. Garcia, Milena Martić, Benoit Mosser, R. Paul Butler, Hans Bruntt, Lszló L. Kiss, Simon J. O'Toole, Eiji Kambe, Hiroyasu Ando, Hideyuki Izumiura, Bun'Ei Sato, Michael Hartmann, Artie Hatzes, Caroline Barban & 30 others Gabrielle Berthomieu, Eric Michel, Janine Provost, Sylvaine Turck-Chièze, Jean Claude Lebrun, Jerome Schmitt, Jean Loup Bertaux, Serena Benatti, Riccardo U. Claudi, Rosario Cosentino, Silvio Leccia, Søren Frandsen, Karsten Brogaard, Lars Glowienka, Frank Grundahl, Eric Stempels, Torben Arentoft, Michael Bazot, Jørgen Christensen-Dalsgaard, Thomas H. Dall, Christoffer Karoff, Jens Lundgreen-Nielsen, Fabien Carrier, Patrick Eggenberger, Danuta Sosnowska, Robert A. Wittenmyer, Michael Endl, Travis S. Metcalfe, Saskia Hekker, Sabine Reffert

    Research output: Contribution to journalArticle

    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 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 446μHz 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 1000s. 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+0.55-0.49days, which is significantly shorter than the 2-4days seen in the Sun.

    Original languageEnglish (US)
    Pages (from-to)935-949
    Number of pages15
    JournalAstrophysical Journal
    Volume713
    Issue number2
    DOIs
    StatePublished - Jan 1 2010

    Fingerprint

    solar oscillations
    oscillation
    ridges
    power spectra
    sun
    asteroseismology
    cool stars
    acoustics
    sidelobes
    lists
    centroids
    stacking
    adjusting
    diagrams
    telescopes
    stars
    life (durability)
    oscillations
    diagram
    profiles

    Keywords

    • Stars: individual (Procyon A)
    • Stars: oscillations

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Bedding, T. R., Kjeldsen, H., Campante, T. L., Appourchaux, T., Bonanno, A., Chaplin, W. J., ... Reffert, S. (2010). A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies. Astrophysical Journal, 713(2), 935-949. https://doi.org/10.1088/0004-637X/713/2/935

    A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies. / Bedding, Timothy R.; Kjeldsen, Hans; Campante, Tiago L.; Appourchaux, Thierry; Bonanno, Alfio; Chaplin, William J.; Garcia, Rafael A.; Martić, Milena; Mosser, Benoit; Butler, R. Paul; Bruntt, Hans; Kiss, Lszló 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-Chièze, Sylvaine; Lebrun, Jean Claude; Schmitt, Jerome; Bertaux, Jean Loup; Benatti, Serena; Claudi, Riccardo U.; Cosentino, Rosario; Leccia, Silvio; Frandsen, Søren; Brogaard, Karsten; Glowienka, Lars; Grundahl, Frank; Stempels, Eric; Arentoft, Torben; Bazot, Michael; Christensen-Dalsgaard, Jørgen; 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.

    In: Astrophysical Journal, Vol. 713, No. 2, 01.01.2010, p. 935-949.

    Research output: Contribution to journalArticle

    Bedding, TR, Kjeldsen, H, Campante, TL, Appourchaux, T, Bonanno, A, Chaplin, WJ, Garcia, RA, Martić, M, Mosser, B, Butler, RP, Bruntt, H, Kiss, LL, O'Toole, SJ, Kambe, E, Ando, H, Izumiura, H, Sato, BE, Hartmann, M, Hatzes, A, Barban, C, Berthomieu, G, Michel, E, Provost, J, Turck-Chièze, S, Lebrun, JC, Schmitt, J, Bertaux, JL, Benatti, S, Claudi, RU, Cosentino, R, Leccia, S, Frandsen, S, Brogaard, K, Glowienka, L, Grundahl, F, Stempels, E, Arentoft, T, Bazot, M, Christensen-Dalsgaard, J, Dall, TH, Karoff, C, Lundgreen-Nielsen, J, Carrier, F, Eggenberger, P, Sosnowska, D, Wittenmyer, RA, Endl, M, Metcalfe, TS, Hekker, S & Reffert, S 2010, 'A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies', Astrophysical Journal, vol. 713, no. 2, pp. 935-949. https://doi.org/10.1088/0004-637X/713/2/935
    Bedding TR, Kjeldsen H, Campante TL, Appourchaux T, Bonanno A, Chaplin WJ et al. A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies. Astrophysical Journal. 2010 Jan 1;713(2):935-949. https://doi.org/10.1088/0004-637X/713/2/935
    Bedding, Timothy R. ; Kjeldsen, Hans ; Campante, Tiago L. ; Appourchaux, Thierry ; Bonanno, Alfio ; Chaplin, William J. ; Garcia, Rafael A. ; Martić, Milena ; Mosser, Benoit ; Butler, R. Paul ; Bruntt, Hans ; Kiss, Lszló 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-Chièze, Sylvaine ; Lebrun, Jean Claude ; Schmitt, Jerome ; Bertaux, Jean Loup ; Benatti, Serena ; Claudi, Riccardo U. ; Cosentino, Rosario ; Leccia, Silvio ; Frandsen, Søren ; Brogaard, Karsten ; Glowienka, Lars ; Grundahl, Frank ; Stempels, Eric ; Arentoft, Torben ; Bazot, Michael ; Christensen-Dalsgaard, Jørgen ; 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. / A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies. In: Astrophysical Journal. 2010 ; Vol. 713, No. 2. pp. 935-949.
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    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 {\'e}chelle 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 446μHz 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 1000s. 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+0.55-0.49days, which is significantly shorter than the 2-4days seen in the Sun.",
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    AU - Kjeldsen, Hans

    AU - Campante, Tiago L.

    AU - Appourchaux, Thierry

    AU - Bonanno, Alfio

    AU - Chaplin, William J.

    AU - Garcia, Rafael A.

    AU - Martić, Milena

    AU - Mosser, Benoit

    AU - Butler, R. Paul

    AU - Bruntt, Hans

    AU - Kiss, Lszló L.

    AU - O'Toole, Simon J.

    AU - Kambe, Eiji

    AU - Ando, Hiroyasu

    AU - Izumiura, Hideyuki

    AU - Sato, Bun'Ei

    AU - Hartmann, Michael

    AU - Hatzes, Artie

    AU - Barban, Caroline

    AU - Berthomieu, Gabrielle

    AU - Michel, Eric

    AU - Provost, Janine

    AU - Turck-Chièze, Sylvaine

    AU - Lebrun, Jean Claude

    AU - Schmitt, Jerome

    AU - Bertaux, Jean Loup

    AU - Benatti, Serena

    AU - Claudi, Riccardo U.

    AU - Cosentino, Rosario

    AU - Leccia, Silvio

    AU - Frandsen, Søren

    AU - Brogaard, Karsten

    AU - Glowienka, Lars

    AU - Grundahl, Frank

    AU - Stempels, Eric

    AU - Arentoft, Torben

    AU - Bazot, Michael

    AU - Christensen-Dalsgaard, Jørgen

    AU - Dall, Thomas H.

    AU - Karoff, Christoffer

    AU - Lundgreen-Nielsen, Jens

    AU - Carrier, Fabien

    AU - Eggenberger, Patrick

    AU - Sosnowska, Danuta

    AU - Wittenmyer, Robert A.

    AU - Endl, Michael

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