Proper motion of very low mass stars and brown dwarfs in the Pleiades cluster

Details Proper motion of very low mass stars and brown dwarfs in the Pleiades cluster Proper motion of very low mass stars and brown dwarfs in the Pleiades cluster

2000-12-05

arxiv.org/abs/astro-ph/0012104v1

Astronomy and Astrophysics

Astrophysics

7 pages, 2 tables, 2 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20000414

We report proper motion measurements for 25 very-low mass (VLM) star and brown dwarf (BD) candidates of the Pleiades cluster previously identified by Bouvier et al. (1998). Proper motions are measured with an accuracy of 9 mas/yr, compared to an expected tangential motion of about 50 mas/yr for Pleiades members. Of the 25 candidates, 15 have a membership probability of 95% or more and 7 are rejected as being field dwarfs. The 3 remaining candidates exhibit independent evidence for membership (lithium absorption or long-term proper motion). From the firm identification of Pleiades VLM and BD members, the cluster's substellar mass function is revised to dN/dM \propto M^{-0.5} in the mass range from 0.04 to 0.3 M_solar.

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