Paper:	Main sequences of open clusters with Hipparcos
Volume:	167, Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era
Page:	72
Authors:	Robichon, N.; Arenou, F.; Lebreton, Y.; Turon, C.; Mermilliod, J. C.
Abstract:	Hipparcos observations of open clusters provide mean cluster parallax determinations with an unprecedented accuracy. Possible biases in the Hipparcos parallaxes exhibited by other authors has been analysed and proven not to exist. A comparison of observed (V, B-V) diagrams of the Pleiades and Praesepe with theoretical isochrones has been performed. It does not exhibit disagreement with Hipparcos mean parallaxes when considering the uncertainties on the theoretical tracks and cluster chemical compositions.

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