Parallaxes and proper motions for 20 open clusters as based on the new Hipparcos catalogue

@article{Leeuwen2009ParallaxesAP,
  title={Parallaxes and proper motions for 20 open clusters as based on the new Hipparcos catalogue},
  author={Floor van Leeuwen},
  journal={Astronomy and Astrophysics},
  year={2009},
  volume={497},
  pages={209-242}
}
Context. A new reduction of the astrometric data as produced by the Hipparcos mission has been published, claiming that the accuracies for nearly all stars brighter than magnitude Hp = 8 are improved, by up to a factor 4, compared to the original catalogue. As correlations between the underlying abscissa residuals have also been reduced by more than an order of magnitude to an insignificant level, our ability to determine reliable parallaxes and proper motions for open clusters should be… Expand
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