Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-19
Astron.Astrophys.390:1115-1118,2002
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, to appear on A&Ap
Scientific paper
10.1051/0004-6361:20020749
We show that the inclusion of special relativistic corrections in the revised OPAL and MHD equations of state has a significant impact on the helioseismic determination of the solar age. Models with relativistic corrections included lead to a reduction of about $0.05 - 0.08 \gi $ with respect to those obtained with the old OPAL or MHD EOS. Our best-fit value is $t_\mathrm{seis} = (4.57 \pm 0.11) \gi $ which is in remarkably good agreement with the meteoritic value for the solar age. We argue that the inclusion of relativistic corrections is important for probing the evolutionary state of a star by means of the small frequency separations $\delta\nu_{{\ell,n}}=\nu_{{\ell,n}}-\nu_{{\ell+2,n-1}}$, for spherical harmonic degrees $\ell = 0,1$ and radial order $n \gg \ell$.
Bonanno Alfio
Paterno` L.
Schlattl Helmut
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