Stellar Structure and Evolution: Deductions from Hipparcos

Stellar Kinematics from Hipparcos Proper Motions

From Hipparcos proper motions, we have analyzed the local kinematics of the Milky Way from the young O-B5 stars, classical Cepheids, and the late-type K-M giants. Comparing the derived results, the kinematical discrepancies between each subset of stars have been analyzed, and the possible reasons for the kinematical di erences have been discussed.

Local stellar kinematics from Hipparcos data

From the parallaxes and proper motions of a kinematically unbiased subsample of the Hipparcos catalogue we have redetermined as a function of colour the kinematics of main-sequence stars. Whereas the radial and vertical components of the mean heliocentric velocity of stars show no trend with colour, the component in the direction of galactic rotation nicely follows the asymmetric drift relation...

Stellar Structure and Evolution

Stellar models and Hyades : the Hipparcos test

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 theor...

Stellar interiors - physical principles, structure, and evolution

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