The VLT-FLAMES survey of massive stars: observations centered on the Magellanic Cloud clusters NGC 330, NGC 346, NGC 2004, and the N11 region

The VLT-FLAMES survey of massive stars: observations centered on the Magellanic Cloud clusters NGC 330, NGC 346, NGC 2004, and the N11 region
复制标题

VLT-FLAMES 大质量恒星巡天:以麦哲伦星云团 NGC 330、NGC 346、NGC 2004 和 N11 区域为中心的观测

DOI:
10.1051/0004-6361:20064988
复制
发表时间:
2006
影响因子:
6.5
通讯作者:
Evans C
Evans C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Evans C

文献摘要

参考文献

被引文献

相似文献

本文介绍了在小麦哲伦星云(SMC)的NGC 330和NGC 346星团,以及大麦哲伦星云(LMC)的NGC 2004和N11区域,利用光纤大阵列多元素光谱仪(FLAMES)对470颗恒星的新观测结果。另外14颗恒星在N11和ngc330中被观测到,使用紫外和视觉梯队光谱仪(UVES)进行一个单独的项目。给出了每个目标的光谱分类和恒星径向速度,并仔细检查了二元性。特别是,我们研究了N11的LH9/LH10络合物中心周围以前未被探索的区域,从我们的光谱中发现了约25颗新的o型恒星。我们已经观测到相当多的be型恒星显示出允许的Fe II发射线。这些主要不在星团核心,似乎与经典的be型恒星有关,而不是与主序前的天体有关。与Hα的等效宽度相比,Fe II发射的存在与金属丰度的关系并不明显。我们还探索了NGC 330和NGC 2004附近的Be- b型恒星与正常b型恒星的相对比例,与银河系的结果相比,没有发现金属丰度趋势的有力证据。服务观测的结果是,我们在三个火焰场中进行了合理的时间采样。我们发现O型星和早期b型星的双星分数下限为23%至36%。我们的一个目标(NGC 346-013)特别有趣,它有一个巨大的、明显更热的、不那么明亮的次级成分。
We present new observations of 470 stars using the Fibre Large Array Multi-Element Spectrograph (FLAMES) instrument in fields centered on the clusters NGC 330 and NGC 346 in the Small Magellanic Cloud (SMC), and NGC 2004 and the N11 region in the Large Magellanic Cloud (LMC). A further 14 stars were observed in the N11 and NGC 330 fields using the Ultraviolet and Visual Echelle Spectrograph (UVES) for a separate programme. Spectral classifications and stellar radial velocities are given for each target, with careful attention to checks for binarity. In particular, we have investigated previously unexplored regions around the central LH9/LH10 complex of N11, finding ~25 new O-type stars from our spectroscopy. We have observed a relatively large number of Be-type stars that display permitted Fe II emission lines. These are primarily not in the cluster cores and appear to be associated with classical Be-type stars, rather than pre main-sequence objects. The presence of the Fe II emission, as compared to the equivalent width of Hα, is not obviously dependent on metallicity. We have also explored the relative fraction of Be- to normal B-type stars in the field-regions near to NGC 330 and NGC 2004, finding no strong evidence of a trend with metallicity when compared to Galactic results. A consequence of service observations is that we have reasonable time-sampling in three of our FLAMES fields. We find lower limits to the binary fraction of O- and early B-type stars of 23 to 36%. One of our targets (NGC 346-013) is especially interesting with a massive, apparently hotter, less luminous secondary component.
了解 SMC 低金属丰度环境中的 B 型超巨星
DOI: --
发表时间: 2003
期刊:
影响因子: --
作者:
C. Trundle;D. Lennon;J. Puls;Peter Schneider Isaac Newton Group of Telescopes;La Pama;S. T. Q. U. Belfast;Belfast;N. I. U. Munchen;H Germany
通讯作者: H Germany
DOI: 10.1051/0004-6361:20020116
发表时间: 2002-01
影响因子: 6.5
作者:
A. Korn;Stefan Keller;A. Kaufer;N. Langer;N. Przybilla;O. Stahl;B. Wolf
通讯作者: A. Korn;Stefan Keller;A. Kaufer;N. Langer;N. Przybilla;O. Stahl;B. Wolf
天文学与天体物理学手稿编号(稍后将手写插入) 1 ESO 成像调查预火焰调查:选定恒星场的观测 ⋆。
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
Shelanee Theresa P. Ruales;Wim Van Petegem;Josefina M. Tabudlong;Orhan Ağirdağ
通讯作者: Orhan Ağirdağ
SMC 中的 NGC 330 星团(论文 II):主序星中的 Hα 发射
DOI: --
发表时间: 1972
期刊:
影响因子: --
作者:
M. Feast
通讯作者: M. Feast
NGC 346 的光电离模型
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
M. Relaño;M. Peimbert;John E. Beckman
通讯作者: John E. Beckman