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Title:
Multiplicity Among Very Low Mass Stars and Brown Dwarfs in the Pleiades
Authors:
Dahm, S. E.; Martín, E. L.
Publication:
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August 3), eds. A. Brown, G.M. Harper, and T.R. Ayres, (University of Colorado), 2003, p. 634-640.
Publication Date:
10/2003
Origin:
AUTHOR
Bibliographic Code:
2003csss...12..634D

Abstract

We present initial results of an HST WFPC-2 photometric survey of selected very low-mass (VLM) stars and brown dwarf candidates in the Pleiades. With a sample size of 23 objects, only one is definitively resolved as a binary with a separation of less than 12 AU for a given distance of 125 pc. Three others were found to have elongated PSFs, but could not be resolved. Of these candidates, CFHT-PL-19 was assessed to be a non-member based upon the proper motion survey of Moraux, Bouvier and Stauffer (2001). These results complement those of Martín et al. (2000) in which an HST NICMOS and CFHT adaptive optics survey of 34 Pleiades members found no resolved pairs with separations greater than 27 AU. Combining the new observations with those of Martín et al. (2000), we find that a dearth of VLM binaries with separations of greater than 15 AU (P˜184 yr) exists within the Pleiades. These findings provide tentative evidence that the period distribution of VLM binaries in the Pleiades is significantly different from that of the cluster F5-K0 stars and the field solar analogues.
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