A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies
Article
Article Title | A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | 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, László 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, Michaël, 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 and Reffert, Sabine |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 713 (2), pp. 935-949 |
Number of Pages | 15 |
Year | 2010 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/713/2/935 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/0004-637X/713/2/935 |
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. © 2010 The American Astronomical Society. |
Keywords | Stars: individual (Procyon A); Stars: oscillations |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions, but may be accessed online. Please see the link in the URL field. |
Funder | Science and Technology Facilities Council |
Byline Affiliations | University of Sydney |
Aarhus University, Denmark | |
University of Porto, Portugal | |
University of Paris, France | |
INAF - Catania Astrophysical Observatory, Italy | |
University of Birmingham, United Kingdom | |
CEA Paris-Saclay, France | |
University of Versailles Saint-Quentin-en-Yvelines, France | |
Pierre and Marie Curie University, France | |
Carnegie Institution of Washington, United States | |
Konkoly Observatory, Hungary | |
Anglo-Australian Observatory, Australia | |
Okayama Astrophysical National Astronomical Observatory, Japan | |
National Astronomical Observatory of Japan, Japan | |
Tokyo Institute of Technology, Japan | |
Karl Schwarzschild Observatory, Germany | |
University of Nice Sophia Antipolis, France | |
Haute-Provence Observatory, France | |
University of Padua, Italy | |
INAF - Astronomical Observatory of Padova, Italy | |
Capodimonte Astronomical Observatory, Italy | |
Uppsala University, Sweden | |
European Southern Observatory (ESO), Germany | |
Catholic University Leuven, Belgium | |
University of Geneva, Switzerland | |
EPFL Observatory, Switzerland | |
University of Texas at Austin, United States | |
University of New South Wales | |
National Center for Atmospheric Research, United States | |
Leiden University, Netherlands | |
Heidelberg University, Germany |
https://research.usq.edu.au/item/xzy07/a-multi-site-campaign-to-measure-solar-like-oscillations-in-procyon-ii-mode-frequencies
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