EDP Sciences
Free access
Volume 380, Number 1, December II 2001
Page(s) 137 - 141
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20011427

A&A 380, 137-141 (2001)
DOI: 10.1051/0004-6361:20011427

The ionising cluster of 30 Doradus

IV. Stellar kinematics
G. Bosch1, 2, F. Selman3, J. Melnick3 and R. Terlevich1

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

(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 ${\sim}35$ 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 ~ $ 5 \times 10^{5}$ $M_\odot$. 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

Offprint request: G. Bosch, guille@fcaglp.unlp.edu.ar

SIMBAD Objects

© ESO 2001

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.