Spectroscopy of a young brown dwarf in the rho Ophiuchi cluster

被引:96
作者
Luhman, KL
Liebert, J
Rieke, GH
机构
[1] Steward Observatory, University of Arizona, Tucson
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
stars; formation; low-mass; brown dwarfs; pre-main-sequence;
D O I
10.1086/316784
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present observations of a young (similar to 3-10 Myr old) brown dwarf within the rho Ophiuchi star-forming region. A low-resolution optical spectrum exhibits a spectral type of M8.5 +/- 0.5 and strong H alpha emission (W lambda similar to 60 Angstrom). After demonstrating the youth of this source through several additional lines of evidence, we place it on the H-R diagram and use the latest evolutionary tracks to derive a substellar mass of 0.01-0.06 M.. A more accurate mass estimate will require tests of the evolutionary tracks and temperature scales at such young ages and late types.
引用
收藏
页码:L165 / L168
页数:4
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