Southern very low mass stars and brown dwarfs in wide binary and multiple systems

被引：47

作者：

Caballero, Jose Antonio ^{[1
]}

机构：

[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 667卷 / 01期

关键词：

binaries : visual; stars : formation; stars : individual (2MASS J23310161-0406193 AB; HD; 221356; LP; 655-23); stars; low-mass; brown dwarfs;

D O I：

10.1086/520873

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The results of the Konigstuhl survey in the Southern Hemisphere are presented. I have searched for common proper motion companions to 173 field very low mass stars and brown dwarfs with spectral types > M5.0 V and magnitudes J less than or similar to 14.5 mag. I have measured for the first time the common proper motion of two new wide systems containing very low mass components, Konigstuhl 2 AB and 3 A-BC. Together with Konigstuhl 1 AB and 2M 0126-50 AB, they are among the widest systems in their respective classes (r = 450-11,900 AU). I have determined the minimum frequency of field wide multiples (r > 100 AU) with late-type components at 5.0% +/- 0.9% and the frequency of field wide late-type binaries with mass ratios q > 0.5 at 1.2% +/- 0: 9%. These values represent a key diagnostic of evolution history and low-mass star and brown dwarf formation scenarios. In addition, the proper motions of 62 field very low mass dwarfs are measured here for the first time.

引用

页码：520 / 526

页数：7

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