High-mass binaries in the very young open cluster NGC 6231 -: Implication for cluster and star formation

被引：95
|
作者：
García, B
Mermilliod, JC
机构：
[1] CRICyT Ctr Reg Invest Cientificas & Tecn, RA-5500 Mendoza, Argentina
[2] Univ Lausanne, Inst Astron, CH-1290 Chavannes Bois, Switzerland
来源：
ASTRONOMY & ASTROPHYSICS | 2001年 / 368卷 / 01期
关键词：
galaxies : open clusters and associations : NGC 6231; stars : binaries : spectroscopic; stars : early-type; stars : rotation;
D O I：
10.1051/0004-6361:20000528
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
New radial-velocity observations of 31 O- and B stars in the very young open cluster NGC 6231 confirm the high frequency of short-period spectroscopic binaries on the upper main sequence. Among the 14 O-type stars, covering all luminosity classes from dwarfs to supergiants, 8 are definitively double-lined systems and all periods I,ut one are shorter than 7 days. Several additional binaries have been detected among the early B-type stars. NGC 6231 is an exceptional cluster to constrain the scenarios of cluster- and binary-star formation over a large range of stellar masses. We discuss the evidences! based on NGC 6231 and 21 other clusters, with a total of 120 O-type stars, for a clear dichotomy in the multiplicity rate and structure of very young open clusters containing O-type stars in function of the number of massive stars. However, we cannot answer the question whether the observed characteristics result from the formation processes or from the early dynamical evolution.
引用
收藏
页码：122 / 136
页数：15
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