2005/09/13 by Christophe Martayan, C. Martayan, A. M. Hubert +13 · 27 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Cluster (spacecraft) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Open cluster #Physics #Population #Spectral line #Star cluster #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20052760
published in Astronomy and Astrophysics 445(3), 931-937 (EDP Sciences) · 12 pages, 17 figures, accepted to A&A
arxiv created 2005/09/13 · openalex publication_date 2006/01/01 · arxiv updated 2014/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.