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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 1999

Open clusters with Hipparcos I. Mean astrometric parameters

Résumé

New memberships, mean parallaxes and proper motions of all 9 open clusters closer than 300 pc (except the Hyades) and 9 rich clusters between 300 and 500 pc have been computed using Hipparcos data. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to 0.5 mas/yr for proper motions, are of great interest for calibrating photometric parallaxes as well as for kinematical studies. Careful investigations of possible biases have been performed and no evidence of significant systematic errors on the mean cluster parallaxes has been found. The distances and proper motions of 32 more distant clusters, which may be used statistically, are also indicated.
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Dates et versions

hal-02053849 , version 1 (01-03-2019)

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  • HAL Id : hal-02053849 , version 1

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N. Robichon, Frédéric Arenou, J.-C Mermilliod, C. Turon. Open clusters with Hipparcos I. Mean astrometric parameters. Astronomy and Astrophysics - A&A, 1999, 345 (2), pp.471-484. ⟨hal-02053849⟩
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