A MULTI-SITE CAMPAIGN TO MEASURE SOLAR-LIKE OSCILLATIONS IN PROCYON. II. MODE FREQUENCIES - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2010

A MULTI-SITE CAMPAIGN TO MEASURE SOLAR-LIKE OSCILLATIONS IN PROCYON. II. MODE FREQUENCIES

A Multi-Site Campaign to Measure Solar-Like Oscillations in Procyon. II. Mode Frequencies

1 SIfA - Sydney Institute for Astronomy
2 DASC - Danish AsteroSeismology Centre
3 CAUP - Centro de Astrofísica da Universidade do Porto
4 IAS - Institut d'astrophysique spatiale
5 OACT - INAF - Osservatorio Astrofisico di Catania
6 School of Physics and Astronomy [Birmingham]
7 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
8 LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
9 OP - Observatoire de Paris - Site de Paris
10 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
11 Department of Terrestrial Magnetism [Carnegie Institution]
12 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
13 Konkoly Observatory
14 AAO - Anglo-Australian Observatory
15 OAO - Okayama Astrophysical Observatory
16 NAOJ - National Astronomical Observatory of Japan
17 Global Edge Institute
18 TLS - Thüringer Landessternwarte Tautenburg
19 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
20 OHP - Observatoire de Haute-Provence
21 HELIOS - LATMOS
22 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
23 OAPD - INAF - Osservatorio Astronomico di Padova
24 OAC - INAF - Osservatorio Astronomico di Capodimonte
25 Department of Physics and Astronomy [Uppsala]
26 ESO - European Southern Observatory
27 Institute of Astronomy [Leuven]
28 ObsGE - Observatoire Astronomique de l'Université de Genève
29 UNSW - University of New South Wales [Sydney]
30 McDonald Observatory
31 HAO - High Altitude Observatory
32 LSW - Landessternwarte Königstuhl [ZAH]
Eric Michel
  • Function : Author
  • PersonId : 1224552
Jean-Loup Bertaux

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 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+0.55 -0.49 days, which is significantly shorter than the 2-4 days seen in the Sun.
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hal-00475239 , version 1 (06-03-2020)

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Thimothy R. Bedding, Hans Kjeldsen, Tiago L. Campante, Thierry Appourchaux, Alfio Bonanno, et al.. A MULTI-SITE CAMPAIGN TO MEASURE SOLAR-LIKE OSCILLATIONS IN PROCYON. II. MODE FREQUENCIES. The Astrophysical Journal, 2010, 713 (2), pp.935-949. ⟨10.1088/0004-637X/713/2/935⟩. ⟨hal-00475239⟩
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