New brown dwarfs in the south part of the Upper Scorpius Association

被引：20
作者：
Dawson, P. [1 ]
Scholz, A. [1 ]
Ray, T. P. [1 ]
机构：
[1] Dublin Inst Adv Studies, Sch Cosm Phys, Dublin 2, Ireland
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2011年 / 418卷 / 02期
基金：
美国国家科学基金会; 美国国家航空航天局; 爱尔兰科学基金会;
关键词：
techniques: photometric; open clusters and associations: individual: Upper Scorpius; infrared: stars; LOW-MASS STARS; WIDE-FIELD CAMERA; OB ASSOCIATION; DATA RELEASE; OBJECTS; CANDIDATES; CLUSTER; UKIDSS; 2MASS; YOUNG;
D O I：
10.1111/j.1365-2966.2011.19573.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
This paper presents the results of a search for brown dwarfs in the Upper Scorpius Association using data from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey. Candidate young brown dwarfs were first chosen by their position in colour magnitude diagrams with further selection based on proper motions to ensure Upper Scorpius membership. Proper motions were derived by comparing UKIDSS and Two Micron All Sky Survey (2MASS) data. Using that method we identify 19 new brown dwarfs in the southern part of the association. In addition there are up to eight likely members with slightly higher dispersion velocity. The ratio of brown dwarfs to stars was found to be consistent with other areas in Upper Scorpius. It was also found to be similar to other results from young clusters with OB associations, and lower than those without, suggesting the brown dwarf formation rate may be a function of environment.
引用
收藏
页码：1231 / 1237
页数：7
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