Martayan, C. ; Hubert, A. M. ; Floquet, M. ; Fabregat, J. ; Frémat, Y. ; Neiner, C. ; Stee, P. ; Zorec, J.

published in Astronomy and Astrophysics, 445, pp. 931-937 (2006)

Abstract: 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), [ion{S}{ii}] and [ion{N}{ii}] nebular lines. These lines are typical of ion{H}{ii} 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 ion{H}{i} at 21 cm.

DOI: 10.1051/0004-6361:20052760
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