Volume 380, Number 1, December II 2001
|Page(s)||137 - 141|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||15 December 2001|
The ionising cluster of 30 Doradus*
IV. Stellar kinematics
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, email@example.com
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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