Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299..955p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 4, pp. 955-964.
Astronomy and Astrophysics
Astronomy
46
Catalogues, Celestial Mechanics, Stellar Dynamics, Stars: Low-Mass, Brown Dwarfs, Open Clusters And Associations: Individual: Pleiades
Scientific paper
A membership catalogue for the Pleiades is divided into four mass bins, and a tidally truncated King profile is fitted to each bin with good agreement with the data. The tidal radius of the cluster is found to be 13.1 pc, and the total mass of the cluster down to the stellar limit is calculated to be 735M. The spread of stars in each bin, as well as the relaxation and crossing times, shows the Pleiades to be an approximately relaxed cluster with equilibrium between the density and velocity distributions. The cluster kinetic energy and binding energy are consistent with the virial theorem, indicating no large unseen population of brown dwarfs. However, the 1sigma errors in the cluster parameters provide an upper limit to the mass of any brown dwarf population of 131M, which would show up in deep CCD surveys as <=5.5 brown dwarfs per 10x10 arcminute field in the cluster centre.
Hodgkin Simon T.
Jameson Richard F.
Pinfield David J.
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