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
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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
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发表时间:
2006
影响因子:
6.5
通讯作者:
Evans C
中科院分区:
文献类型:
--
作者:
Evans C
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.
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DOI:
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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
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
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
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
M. Feast
通讯作者:
M. Feast
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