Issue |
A&A
Volume 380, Number 1, December II 2001
|
|
---|---|---|
Page(s) | 137 - 141 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20011427 | |
Published online | 15 December 2001 |
The ionising cluster of 30 Doradus*
IV. Stellar kinematics
1
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
2
Facultad de Ciencias Astronómicas y Geofísica, La Plata, Argentina
3
European Southern Observatory, Alonso de Córdova 3107, Santiago, Chile
Corresponding author: G. Bosch, guille@fcaglp.unlp.edu.ar
Received:
6
June
2001
Accepted:
4
October
2001
On the basis of
multislit spectroscopy of 180 stars in the ionising cluster of 30
Doradus we present reliable radial velocities for 55 stars.
We calculate a radial velocity dispersion of km s-1
for the cluster and we analyse the possible influence of spectroscopic
binaries in this rather large velocity dispersion. We use numerical simulations to
show that the observations are consistent with the hypothesis that all the stars
in the cluster are binaries, and the total mass of the cluster is
~
. A simple test shows only marginal evidence for
dynamical mass segregation which if present is most likely not due to dynamical
relaxation.
Key words: stars: early-type / stars: kinematics / binaries: spectroscopic / galaxies: clusters: general / galaxies: Magellanic Clouds
© ESO, 2001
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