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astro-ph1999
Open clusters with Hipparcos I. Mean astrometric parameters
N. Robichon, F. Arenou, J. -C. Mermilliod +1
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 usin…
astro-ph1998
Distances and absolute magnitudes from trigonometric parallaxes
F. Arenou, X. Luri
We first review the current knowledge of Hipparcos systematic and random errors, in particular small-scale correlations. Then, assuming Gaussian parallax errors and using examples…
astro-ph1997
Some Considerations in making full Use of the Hipparcos Catalogue
A. G. A. Brown, F. Arenou, F. van Leeuwen +2
This contribution is intended as a `rough guide' to the Hipparcos Catalogue for the non-expert user. Some general aspects of the use of astrometric data are discussed as well as Hi…