Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-07-30
Astronomy and Astrophysics
Astrophysics
4 pages, to be published in "Stellar clusters and associations: Convection, Rotation, and Dynamos", Sicily, ed. R. Pallavicini
Scientific paper
Three independent sets of stellar theoretical models are tested with well-detached systems of the Hyades open cluster: 51 Tau, V818 Tau, and $\theta^2$ Tau. The choice of these objects is discussed and a statistical method is described and applied to the colour-magnitude diagram (CMD) of the selected stars, giving rise to contour levels in the metallicity-age plane. The effects of the Hipparcos parallaxes on these confidence regions, with influence on both age and metallicity, are studied for the V818 Tau system through a comparison with very accurate but older orbital parallaxes. Finally, theoretical simultaneous age-metallicity estimates are given for the three binaries and compared with observational constraints.
Lastennet Erwan
Lejeune Th.
Oblak Edouard
Valls-Gabaud David
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