DENIS-P J1228.2–1547—A New Benchmark Brown Dwarf
DENIS-P J1228.2–1547—A New Benchmark Brown Dwarf
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DOI：
10.1086/311011
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发表时间：
1997-07
期刊：
影响因子：
--
通讯作者：
C. Tinney;X. Delfosse;T. Forveille
中科院分区：
文献类型：
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作者：
C. Tinney;X. Delfosse;T. Forveille
我们提出了三个棕矮星候选人在第一个1%的DENIS巡天确定的光谱。从6430到9150的低解析度光谱显示，这些天体与候选的棕矮星GD 165 B有相似的光谱。高解析度光谱显示其中一颗天体--DENIS-P J1228.2-1547--有一条强的2.3 ± 0.05等效宽度的Li I λ6708吸收线，因此是一颗质量低于0.065 M的褐矮星，年龄为1.5 Gyr。DENIS-P J1228.2-1547现在可以被认为是比Gl 229 B更接近氢燃烧极限的棕矮星的原型。
We present optical spectroscopy of three brown dwarf candidates identified in the first 1% of the DENIS sky survey. Low-resolution spectra from 6430 to 9150 Å show these objects to have similar spectra to the brown dwarf candidate GD 165B. High-resolution spectroscopy shows that one of the objects—DENIS-P J1228.2-1547—has a strong 2.3 ± 0.05 Å equivalent width absorption line of Li I λ6708 and is therefore a brown dwarf with mass below 0.065 M☉, and age ≲1.5 Gyr. DENIS-P J1228.2-1547 can now be considered a prototype for brown dwarfs closer to the hydrogen-burning limit than Gl 229B.