Spectroscopically confirmed brown dwarf members of Coma Berenices and the Hyades

被引:20
作者
Casewell, S. L. [1 ]
Littlefair, S. P. [2 ]
Burleigh, M. R. [1 ]
Roy, M. [1 ]
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.
引用
收藏
页码:2644 / 2649
页数:6
相关论文
共 42 条
[1]   A NEAR-INFRARED SPECTROSCOPIC STUDY OF YOUNG FIELD ULTRACOOL DWARFS [J].
Allers, K. N. ;
Liu, Michael C. .
ASTROPHYSICAL JOURNAL, 2013, 772 (02)
[2]   Low-mass stars and brown dwarfs in Praesepe [J].
Baker, D. E. A. ;
Jameson, R. F. ;
Casewell, S. L. ;
Deacon, N. ;
Lodieu, N. ;
Hambly, N. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 408 (04) :2457-2475
[3]   L and t dwarfs in the hyades and ursa major moving groups [J].
Bannister, N. P. ;
Jameson, R. F. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 378 (01) :L24-L28
[4]   The first spectroscopically identified L dwarf in Praesepe [J].
Boudreault, S. ;
Lodieu, N. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 434 (01) :142-147
[5]   Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey - III. Praesepe [J].
Boudreault, S. ;
Lodieu, N. ;
Deacon, N. R. ;
Hambly, N. C. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 426 (04) :3419-3434
[6]   Brown dwarfs and very low mass stars in the Hyades cluster: a dynamically evolved mass function [J].
Bouvier, J. ;
Kendall, T. ;
Meeus, G. ;
Testi, L. ;
Moraux, E. ;
Stauffer, J. R. ;
James, D. ;
Cuillandre, J. -C. ;
Irwin, J. ;
McCaughrean, M. J. ;
Baraffe, I. ;
Bertin, E. .
ASTRONOMY & ASTROPHYSICS, 2008, 481 (03) :661-U31
[7]   Binaries and the L dwarf/T dwarf transition [J].
Burgasser, Adam J. .
ASTROPHYSICAL JOURNAL, 2007, 659 (01) :655-674
[8]   Discovery of a high proper motion L dwarf binary: 2MASS J15200224-4422419AB [J].
Burgasser, Adam J. ;
Looper, Dagny L. ;
Kirkpatrick, J. Davy ;
Liu, Michael C. .
ASTROPHYSICAL JOURNAL, 2007, 658 (01) :557-568
[9]   SpeX SPECTROSCOPY OF UNRESOLVED VERY LOW MASS BINARIES. I. IDENTIFICATION OF 17 CANDIDATE BINARIES STRADDLING THE L DWARF/T DWARF TRANSITION [J].
Burgasser, Adam J. ;
Cruz, Kelle L. ;
Cushing, Michael ;
Gelino, Christopher R. ;
Looper, Dagny L. ;
Faherty, Jacqueline K. ;
Kirkpatrick, J. Davy ;
Reid, I. Neill .
ASTROPHYSICAL JOURNAL, 2010, 710 (02) :1142-1169
[10]   Resolved spectroscopy of M dwarf/L dwarf binaries. I. Denis J220002.05-303832.9AB [J].
Burgasser, AJ ;
McElwain, MW .
ASTRONOMICAL JOURNAL, 2006, 131 (02) :1007-1014