2005A&A...429..895M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET20:14:44

2005A&A...429..895M - Astronomy and Astrophysics, volume 429, 895-901 (2005/1-3)

Kinematics of stars and brown dwarfs at birth.

MORAUX E. and CLARKE C.

Abstract (from CDS):

We use numerical N-body simulations in order to test whether the kinematics of stars and brown dwarfs at birth depend on mass. In particular we examine how initial variations in velocity dispersion can affect the spatial distribution of stellar and substellar objects in clusters. We use ``toy'' N-body models of a Pleiades-like cluster in which brown dwarfs have their own velocity dispersion σVBD which is k times larger than the stellar one. We find that in order to match the broad agreement between the brown dwarf fraction in the field and in the Pleiades, the velocity dispersion of brown dwarfs at birth has to be less than twice the stellar velocity dispersion, i.e. cannot exceed a few km/s in the Pleiades cluster. In order to discern more subtle differences between the kinematics of brown dwarfs and stars at birth, our simulations show that we need to look at clusters that are much less dynamically evolved than the Pleiades. One might especially seek evidence of high velocity brown dwarfs at birth by examining spatial distribution of stars and brown darfs in clusters that are about a crossing timescale old.

Abstract Copyright:

Journal keyword(s): stellar dynamics - stars: low-mass, brown dwarfs - Galaxy: open clusters and associations: individual: Pleiades - stars: kinematics - methods: N-body simulations

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1245 1
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3061 0
3 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1497 1
4 V* PV Cep Or* 20 45 53.9537161790 +67 57 38.678052612   19.27 17.46 15.98 14.60 A5 255 3

    Equat.    Gal    SGal    Ecl

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2021.02.24-20:14:44

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