The first wide ultracool binary dwarf in the field:: DENIS-J055146.0-443412.2 (M8.5+L0)

被引：45

作者：

Billères, M

Delfosse, X

Beuzit, JL

Forveille, T

Marchal, L

Martín, EL

机构：

[1] European So Observ, Santiago 19, Chile

[2] Observ Grenoble, Lab Astrophys Grenoble, F-38041 Grenoble, France

[3] Canada France Hawaii Telescope Corp, Kamuela, HI 96743 USA

[4] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 440卷 / 02期

关键词：

stars; brown dwarfs; binary system; formation;

D O I：

10.1051/0004-6361:200500167

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present observations of a new very low mass field binary, discovered during an infrared imaging survey of 250 DENIS L and very late-M dwarfs. DENIS-J055146.0-443412.2 is an M8.5 + L0 pair, with a physical separation of over 200 AU. This makes it the widest very low mass binary known in the field, by an order of magnitude. Such a system is fragile, and it would not have survived a close encounter with a third body. Its existence demonstrate that some very low mass stars/brown dwarfs form without ejection from a multiple system, or any other strong dynamical interaction.

引用

页码：L55 / L58

页数：4

共 32 条

[1]

[Anonymous], 2MASS SKY CATALOG PO

[2]

[Anonymous], ASTRON ASTROPHYS

[3] The formation of a star cluster: predicting the properties of stars and brown dwarfs [J].