¹ GEPI, UMR8111 du CNRS, Observatoire de Paris-Meudon, 92195 Meudon Cedex, France
² Universidad de València, 46071 València, Spain
³ Royal Observatory of Belgium, 3 Avenue Circulaire, 31180 Brussels, Belgium
⁴ Observatoire de la Côte d'Azur, avenue Nicolas Copernic, 06130 Grasse, France
⁵ Institut d'Astrophysique de Paris (IAP), 98bis boulevard Arago, 75014 Paris, France

Observations of hot stars belonging to the young cluster LMC-NGC2004 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 (H and H), [SII] and [NII] nebular lines. These lines are typical of HII 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 HI at 21 cm.

Accepted by A&A
Preprints from christophe.martayan@obspm.fr
Or on the web at http://arxiv.org/abs/astro-ph/0509339