标题： 利用VLT-FLAMES对大型麦哲伦云疏散星团NGC 2004中B型和Be型星族群的研究 显示英文标题

标题： A study of the B and Be star population in the field of the LMC open cluster NGC2004 with VLT-FLAMES

摘要： 属于年轻星团LMC-NGC2004及其周围区域的热星已被VLT-GIRAFFE设备以MEDUSA模式观测到。发现了25颗Be星；发现麦哲伦云（LMC）和星系场中的B型星中Be星的比例大致相同。发现了23颗炽热星为光谱双星（SB1和SB2），其中5个被发现是从MACHO数据库中识别出的掩食系统，周期为几天。 我们样本中约75%的光谱受到氢（Hα和Hγ）、[SII]和[NII]星云线的污染。 这些线是HII区的典型特征。 它们可能与具有径向速度双峰分布的斑块状星云有关，在已知的LMC4氢原子HI 21厘米辐射中南部区域更易观察到较高的径向速度值（+335 km s^{-1}）。 显示英文摘要

摘要： 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 (Halpha and Hgamma), [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 kms^{-1}) preferentially seen inside the southern part of the known bubble LMC4 observed in HI at 21 cm.