Issue |
A&A
Volume 367, Number 1, February III 2001
|
|
---|---|---|
Page(s) | 211 - 217 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20000414 | |
Published online | 15 February 2001 |
Proper motion of very low mass stars and brown dwarfs in the Pleiades cluster*
1
Laboratoire d'Astrophysique, Observatoire de Grenoble, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
2
SIRTF Science Center, Caltech, Pasadena, CA 91125, USA
Corresponding author: E. Moraux, moraux@laog.obs.ujf-grenoble.fr
Received:
16
November
2000
Accepted:
30
November
2000
We report proper motion measurements for 25 very-low mass (VLM)
star and brown dwarf (BD) candidates of the Ple iades cluster previously
identified by Bouvier et al. ([CITE]). 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 in the mass range
from 0.04 to 0.3
.
Key words: stars: low-mass, brown dwarfs / stars: luminosity function, mass function / Galaxy: open clusters and associations: individual: Pleiades
© ESO, 2001
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