Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...460..759p&link_type=abstract
Astronomy and Astrophysics, Volume 460, Issue 3, December IV 2006, pp.759-767
Astronomy and Astrophysics
Astrophysics
13
Stars: Oscillations, Stars: Evolution, Stars: Individual: Procyon A
Scientific paper
Models of Procyon A satisfying the actual observational constraints, particularly the asteroseismic ones, are discussed. The oscillations of these models were computed and analysed. We looked for seismic signatures of the evolutionary status of Procyon A. We show that the behavior of the small frequency spacings, particularly δν01 allows us to distinguish between main sequence and post-main sequence models, all satisfying the observational constraints on mass, effective temperature, radius, and surface metallicity of Procyon A. We also introduce a new seismic evolution criterion, varepsilon, based on the comparison of the low and high frequency parts of the power spectrum. The comparison of the seismic properties of the models with the available asteroseismic observations does not allow us to definitely decide on the stage of evolution of Procyon A. Much more accurate frequencies must be obtained especially in the low-frequency domain to distinguish between the models.
Berthomieu Gabrielle
Martic Milena
Morel Pascal
Provost Janine
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