共 42 条
Spectroscopically confirmed brown dwarf members of Coma Berenices and the Hyades
被引:20
作者:

Casewell, S. L.
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机构:
Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

Littlefair, S. P.
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Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

Burleigh, M. R.
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Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

Roy, M.
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Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
机构:
[1] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[2] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
关键词:
brown dwarfs;
stars: low-mass;
open clusters and associations: individual: Hyades;
LOW-MASS STARS;
INFRARED TELESCOPE FACILITY;
T-DWARFS;
ULTRACOOL DWARFS;
PROPER MOTIONS;
OPEN CLUSTER;
FIELD L;
PRAESEPE;
STELLAR;
2MASS;
D O I:
10.1093/mnras/stu746
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We have obtained low- and medium-resolution spectra of nine brown dwarf candidate members of Coma Berenices and the Hyades using SpEX on the NASA InfraRed Telescope Facility and Long Slit Intermediate Resolution Infrared Spectrograph on the William Herschel Telescope. We conclude that seven of these objects are indeed late M or early L dwarfs, and that two are likely members of Coma Berenices and four of the Hyades. Two objects, cbd40 and Hy3, are suggested to be field L dwarfs, although there is also a possibility that Hy3 is an unresolved binary belonging to the cluster. These objects have masses between 71 and 53M(Jup), close to the hydrogen-burning boundary for these clusters; however, only an optical detection of lithium can confirm if they are truly substellar.
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页码:2644 / 2649
页数:6
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