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The Distance to the Pleiades Revisited

Published online by Cambridge University Press:  12 July 2007

David Valls-Gabaud
David Valls-Gabaud*
Affiliation:
GEPI, CNRS UMR 8111, Observatoire de Paris, France email: david.valls-gabaud@obspm.fr
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Abstract

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The parallax of the Pleiades has been mired in controversy ever since the very first astrometric measures in the late 1880s. Over a century later, the measures from the HIPPARCOS catalogue gave results which were inconsistent with the distance inferred from the fitting of the colour-magnitude diagram. We briefly review here the debate and focus on the various attempts made at solving the problem, and especially those using binary stars. The only double-lined eclipsing binary found so far in the Pleiades, HD 23642, provides not only the final answer to the problem but also, through detailed state-of-the-art analyses, the fundamental calibration for binaries in more distant clusters and hence in the Local Group. We discuss some of the various sources of systematic uncertainties that limit, so far, the accuracy of the measured stellar parameters to about 1% and the progress that is required to break this barrier.

Keywords

Stars: fundamental parametersStars: binaries: eclipsingStars: binaries: spectroscopicGalaxy: open clustersMethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 281 - 289
Copyright
Copyright © International Astronomical Union 2007

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