Volume 445, Number 3, January III 2006
|Page(s)||931 - 937|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||03 January 2006|
A study of the B and Be star population in the field of the LMC open cluster NGC 2004 with VLT-FLAMES
GEPI, UMR8111 du CNRS, Observatoire de Paris-Meudon, 92195 Meudon Cedex, France e-mail: email@example.com
2 Universidad de Valencía, Instituto de Ciencia de los Materiales, PO Box 22085, 46071 Valencía, Spain
3 Royal Observatory of Belgium, 3 avenue Circulaire, 31180 Brussels, Belgium
4 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 220B, 3001 Belgium
5 Observatoire de la Côte d'Azur, avenue Nicolas Copernic, 06130 Grasse, France
6 Institut d'Astrophysique de Paris (IAP), 98bis boulevard Arago, 75014 Paris, France
Accepted: 21 August 2005
Observations of hot stars belonging to the young cluster LMC-NGC 2004 and its surrounding region have been obtained with the VLT-GIRAFFE facilities in MEDUSA mode. 25 Be stars were discovered; the proportion of Be stars compared to B-type stars is found to be of the same order in the LMC and in the Galaxy fields. 23 hot stars were discovered as spectroscopic binaries (SB1 and SB2), 5 of these are found to be eclipsing systems from the MACHO database, with periods of a few days. About 75% of the spectra in our sample are polluted by hydrogen (Hα and Hγ),  and  nebular lines. These lines are typical of regions. They could be associated with patchy nebulosities with a bi-modal distribution in radial velocity, with higher values (+335 km s-1) preferentially seen inside the southern part of the known bubble LMC4 observed in at 21 cm.
Key words: stars: early-type / stars: emission-line, Be / galaxies: Magellanic Clouds / stars: binaries: spectroscopic / stars: binaries: eclipsing / ISM: lines and bands
© ESO, 2006
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