Analysis of Seven Nearby Open Clusters using HIPPARCOS Data
Résumé
From Hipparcos data in 7 open cluster fields (Praesepe, IC 4756, NGC 2516, NGC 3532, NGC 6475, NGC 6633 and Stock 2) we have computed the membership of stars. The mean cluster distances have been derived from intermediate Hipparcos data. Cluster sequences in the HR diagram have been deduced from their distances, the photometry coming from the `Base des Amas'. Comparison between the relative sequence positions shows that metallicity is probably not the only parameter which influences the position of the ZAMS.
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