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Astron. Astrophys. 322, 455-459 (1997)

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Brown Dwarfs in the Pleiades *

A deep IJK survey

L. Festin

Astronomical Observatory, Box 515, S-75120 Uppsala, Sweden (leif@astro.uu.se)

Received 15 October 1996 / Accepted 15 November 1996


An area large enough (180 [FORMULA]) to put constraints on a possible low mass brown dwarf population in the Pleiades has been surveyed to very faint magnitudes in I, J and K. The completeness limit, I=21.6, corresponds to a mass of 0.01 [FORMULA] for a cluster age of 70 Myr and 0.035 [FORMULA] for 120 Myr. The result is consistent with previous investigations at higher masses that the brown dwarf initial mass function is a [FORMULA], or even less steep, power law. Thus low mass brown dwarfs cannot contribute significantly to the Pleiades' mass. One new possible Pleiades member was found, mass [FORMULA] [FORMULA] (age 120Myr).

Key words: stars: late-type – stars: low-mass, brown dwarfs – stars: luminosity function, mass function – open clusters and associations: individual: Pleiades

* Based on observations made with the Nordic Optical Telescope, La Palma.

Send offprint requests to: L. Festin

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998