International audienceNew 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
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
International audienceNew memberships, mean parallaxes and proper motions of all 9 open clusters clo...
Context. A new reduction of the astrometric data as produced by the Hipparcos mission has been publi...
Mean proper motions and parallaxes of 205 open clusters were determined from their member stars foun...
Mean proper motions and parallaxes of 205 open clusters were determined from their member stars foun...
International audienceThis contribution is intended as a `rough guide' to the Hipparcos Catalogue fo...
Hipparcos parallaxes fix distances to individual stars in the Hyades cluster with an accuracy of ∼6 ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Radial motions of stars in nearby moving clusters are determined fromaccurate proper motions and tri...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
International audienceNew memberships, mean parallaxes and proper motions of all 9 open clusters clo...
Context. A new reduction of the astrometric data as produced by the Hipparcos mission has been publi...
Mean proper motions and parallaxes of 205 open clusters were determined from their member stars foun...
Mean proper motions and parallaxes of 205 open clusters were determined from their member stars foun...
International audienceThis contribution is intended as a `rough guide' to the Hipparcos Catalogue fo...
Hipparcos parallaxes fix distances to individual stars in the Hyades cluster with an accuracy of ∼6 ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Radial motions of stars in nearby moving clusters are determined fromaccurate proper motions and tri...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a ...