Stellar models and Hyades: the Hipparcos test |
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| Authors: | V Castellani S Degl'Innocenti P G Prada Moroni |
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| Institution: | Dipartimento di Fisica, Universitàdi Pisa, piazza Torricelli 2, 56126 Pisa, Italy;INFN Sezione di Pisa, via Livornese 1291, 56010 S. Piero a Grado, Pisa, Italy;Dipartimento di Fisica, Universitàdi Genova, via Dodecaneso 33, 16146 Genova, Italy;INFN Sezione di Genova, via Dodecaneso 33, 16146 Genova, Italy |
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| Abstract: | We compare theoretical stellar models for main sequence (MS) stars with the Hipparcos data base 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. |
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| Keywords: | stars: evolution stars: horizontal branch open clusters and associations: individual: Hyades |
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