Detailed models of Procyon A based on new asteroseismic measurements by ? 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 \pm 0.5 \mu Hz favours a mass of 1.497 M _ { \odot } for Procyon A .
We also determine the following global parameters of Procyon A : an age of t = 1.72 \pm 0.30 Gyr , an initial helium mass fraction Y _ { \mathrm { i } } = 0.290 \pm 0.010 , a nearly solar initial metallicity ( Z / X ) _ { \mathrm { i } } = 0.0234 \pm 0.0015 and a mixing–length parameter \alpha = 1.75 \pm 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 .