Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10704651 | New Astronomy | 2005 | 14 Pages |
Abstract
Detailed models of Procyon A based on new asteroseismic measurements by Eggenberger et al. (2004b) 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 μHz favours a mass of 1.497Mâ 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 Yi = 0.290 ± 0.010, a nearly solar initial metallicity (Z/X)i = 0.0234 ± 0.0015 and a mixing-length parameter α = 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
P. Eggenberger, F. Carrier, F. Bouchy,