edu.ucar.opensky::articles:10467 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T14:53:16.413437 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7st7q9x A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies 2010-04-20T00:00:00Z publication https://n2t.org/ark:/85065/d7st7q9x https://doi.org/10.1088/0004-637X/713/2/935 Bedding, T. author Kjeldsen, H. author Campante, T. author Appourchaux, T. author Bonanno, A. author Chaplin, W. author Garcia, R. author Martic, M. author Mosser, B. author Butler, R. author Bruntt, H. author Kiss, L. author O'Toole, S. author Kambe, E. author Ando, H. author Izumiura, H. author Sato, B. author Hartman, M. author Hatzes, A. author Barban, C. author Berthomieu, G. author Michel, E. author Provost, J. author Turck-Chièze, S. author Lebrun, J. author Schmitt, J. author Bertaux, J. author Benatti, S. author Claudi, R. author Cosentino, R. author Leccia, S. author Frandsen, S. author Brogaard, K. author Glowienka, L. author Grundahl, F. author Stempels, E. author Arentoft, T. author Bazot, M. author Christensen-Dalsgaard, J. author Dall, T. author Karoff, C. author Lundgreen-Nielsen, J. author Carrier, F. author Eggenberger, P. author Sosnowska, D. author Wittenmyer, R. author Endl, M. author Metcalfe, Travis author Hekker, S. author Reffert, S. author UCAR/NCAR - Library publisher 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication An edited version of this paper was published by The American Astronomical Society. Copyright 2010 The American Astronomical Society. None eng geoscientificInformation