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Mass and Luminosity Function of the Pleiades

Published online by Cambridge University Press:  14 August 2015

Floor van Leeuwen
Floor van Leeuwen*
Affiliation:
Sterrewacht Leiden, The Netherlands

Abstract

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From a proper motion survey by Pels and photometric measurement of selected stars it was found that the Pleiades cluster extends till at least 496 from the centre, corresponding to 10 pc at a distance of 125 pc. It turns out that the luminosity function of the Pleiades is a function of the distance to the centre, the proportion of faint stars increasing with this distance. Because of this, the luminosity function as it was determined before flattened towards fainter stars, whereas for the total field with a diameter of 20 pc one finds a luminosity function that is still increasing at the faint end. Flare star observations in the Pleiades field show that the increase amounts to at least a factor 20 in the mass range 2 to 0.4 M⊙. Accurate proper motions of stars in the projected central field show a dispersion of velocities in the cluster of 700 m/sec. This could indicate a total mass of the Pleiades cluster of the order of 2000 M⊙.

Type
August 28 Open Clusters
Information
Symposium - International Astronomical Union , Volume 85: Star Clusters , 1980 , pp. 157 - 163
Copyright
Copyright © Reidel 1980 

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