The Pleiades question, the definition of the zero-age main sequence, and implications

Details The Pleiades question, the definition of the zero-age main sequence, and implications The Pleiades question, the definition of the zero-age main sequence, and implications

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tvnv.conf..347v&link_type=abstract

Transits of Venus: New Views of the Solar System and Galaxy, Proceedings of IAU Colloquium #196, held 7-11 June, 2004 in Preston

Physics

6

Scientific paper

Determinations and measurements of the parallax of the Pleiades, obtained with ground-based studies and with Hipparcos data, are reviewed. A number of uncertainties in both sets of data are found. Although a further correction for abscissa correlations brings the Hipparcos determination closer to the ground-based value, the difference still seems too large. The new Hipparcos parallax determinations seem to reinforce a possible age related effect. A new reduction of the Hipparcos data is in progress. It reduces significantly the contribution of the attitude noise, providing higher accuracies and lower correlation levels for the brighter stars.

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