Models of Procyon A including seismic constraints

Abstract

Detailed models of Procyon A based on new asteroseismic measurements by Eggenberger et al (2004) have been computed using the Geneva evolution code including shellular rotation and atomic diffusion. By combining all non-asteroseismic observables now available for Procyon A with these seismological data, we find that the observed mean large spacing of 55.5 +- 0.5 uHz favours a mass of 1.497 M_sol for Procyon A. We also determine the following global parameters of Procyon A: an age of t=1.72 +- 0.30 Gyr, an initial helium mass fraction Y_i=0.290 +- 0.010, a nearly solar initial metallicity (Z/X)_i=0.0234 +- 0.0015 and a mixing-length parameter alpha=1.75 +- 0.40. Moreover, we show that the effects of rotation on the inner structure of the star may be revealed by asteroseismic observations if frequencies can be determined with a high precision. Existing seismological data of Procyon A are unfortunately not accurate enough to really test these differences in the input physics of our models.

New Astronomy accepted

References in corpus (4)

• Analysis of alpha Centauri AB including seismic constraints
• The diameter and evolutionary state of Procyon A
• Solar-like oscillations in Procyon A
• p-mode frequencies in solar-like stars : I. Procyon A

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• Evidence for Granulation and Oscillations in Procyon from Photometry with the WIRE satellite
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• Analysis of 70 Ophiuchi AB including seismic constraints
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• The Current Status of Asteroseismology
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• Modeling $\epsilon$ Eridani and asteroseismic tests of element diffusion