Stellar models and Hyades: the Hipparcos test

Abstract

We compare theoretical stellar models for Main Sequence (MS) stars with the Hipparcos database for the Hyades cluster to give a warning against the uncritical use of available theoretical scenarios and to show how formal MS fittings can be fortuitous if not fictitious. Moreover, we find that none of the current theoretical scenarios appears able to account for an observed mismatch between theoretical predictions and observations of the coolest Hyades MS stars. Finally, we show that current theoretical models probably give too faint He burning luminosities unlike the case of less massive He burning models, with degenerate progenitors, which have been suggested to suffer the opposite discrepancy.

5 pages, 8 figures, MNRAS accepted

References in corpus (1)

• DY/DZ from fine structure in the Main Sequence based on Hipparcos parallaxes

Cited by in corpus (23)

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• The Distances to Open Clusters from Main-Sequence Fitting. I. New Models and a Comparison to the Properties of the Hyades Eclipsing Binary vB 22
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• The Distances to Open Clusters as Derived from Main-sequence Fitting. II. Construction of Empirically Calibrated Isochrones
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• Astrophysical properties of 600 bonafide single stars in the Hyades open cluster
• Benchmarking MESA isochrones against the Hyades single star sequence
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• Hyades dynamics from N-body simulations: Accuracy of astrometric radial velocities from Hipparcos
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