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A new assessment of the kinematic distance to the Pleiades: based on radial velocities and proper motions only

Published online by Cambridge University Press:  26 February 2013

S. Röser  and
E. Schilbach
S. Röser
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12–14, 69120 Heidelberg, Germany email: [email protected], elena]@ari.uni-heidelberg.de
E. Schilbach
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12–14, 69120 Heidelberg, Germany email: [email protected], elena]@ari.uni-heidelberg.de
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Abstract

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We present a new determination of the distance to the Pleiades using the moving-cluster method, allowing for inclusion of the effects of expansion and rotation of the cluster. While rotation appears neglegible, we find a slight expansion of the cluster with a maximum velocity of 0.15 km s−1 and a distance modulus of (m − M)0 = 5.50 ± 0.13 mag. This is larger but compatible with the new Hipparcos distance modulus of 5.40 ± 0.03 mag. On the other hand, various distance moduli for the Pleiades are found in the literature, many resulting from isochrone fitting. They scatter around a value of 5.63 mag. Our results are also compatible with these measurements, within the error bars.

Keywords

open clusters and associations: individual (Pleiades)stars: distances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 66 - 69
Copyright
Copyright © International Astronomical Union 2013

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