A mini-survey for variability in early L dwarfs

被引：40
作者：
Clarke, FJ
Oppenheimer, BR
Tinney, CG
机构：
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] Amer Museum Nat Hist, Dept Astrophys, New York, NY 10024 USA
[3] Anglo Australian Observ, Epping, NSW 2121, Australia
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2002年 / 335卷 / 04期
关键词：
techniques : photometric; surveys; stars; low-mass; brown dwarfs;
D O I：
10.1046/j.1365-8711.2002.05691.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report differential I-band photometry of four early L dwarfs, obtained to study variability. We detect variability on a time-scale of hours in two objects, 2MASS 0746425+200032 (at a level of 0.007 mag = 6.5sigma) and 2MASS 1108307+683017 (0.012 mag; 5sigma). We also place upper limits of 0.02 mag (1sigma) on the variability of two others.
引用
收藏
页码：1158 / 1162
页数：5
相关论文
共 13 条
[1]  
[Anonymous], ASTRON ASTROPHYS
[2]   Variability in ultra cool dwarfs: Evidence for the evolution of surface features [J].
Bailer-Jones, CAL ;
Mundt, R .
ASTRONOMY & ASTROPHYSICS, 2001, 367 (01) :218-235
[3]   An effective temperature scale for late-M and L dwarfs, from resonance absorption lines of CSI and RB I [J].
Basri, G ;
Mohanty, S ;
Allard, F ;
Hauschildt, PH ;
Delfosse, X ;
Martín, EL ;
Forveille, T ;
Goldman, B .
ASTROPHYSICAL JOURNAL, 2000, 538 (01) :363-385
[4]   Periodic photometric variability of the brown dwarf Kelu-1 [J].
Clarke, FJ ;
Tinney, CG ;
Covey, KR .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 332 (02) :361-366
[5]   A technique for ultrahigh-precision CCD photometry [J].
Everett, ME ;
Howell, SB .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2001, 113 (789) :1428-1435
[6]   New neighbors from 2MASS: Activity and kinematics at the bottom of the main sequence [J].
Gizis, JE ;
Monet, DG ;
Reid, IN ;
Kirkpatrick, JD ;
Liebert, J ;
Williams, RJ .
ASTRONOMICAL JOURNAL, 2000, 120 (02) :1085-1099
[7]   Dwarfs cooler than "M": The definition of spectral type "L" using discoveries from the 2-Micron All-Sky Survey (2MASS) [J].
Kirkpatrick, JD ;
Reid, IN ;
Liebert, J ;
Cutri, RM ;
Nelson, B ;
Beichman, CA ;
Dahn, CC ;
Monet, DG ;
Gizis, JE ;
Skrutskie, MF .
ASTROPHYSICAL JOURNAL, 1999, 519 (02) :802-833
[8]   Keck imaging of binary L dwarfs [J].
Koerner, DW ;
Kirkpatrick, JD ;
McElwain, MW ;
Bonaventura, NR .
ASTROPHYSICAL JOURNAL, 1999, 526 (01) :L25-L28
[9]   Spectroscopic classification of late-M and L field dwarfs [J].
Martín, EL ;
Delfosse, X ;
Basri, G ;
Goldman, B ;
Forveille, T ;
Osorio, MRZ .
ASTRONOMICAL JOURNAL, 1999, 118 (05) :2466-2482
[10]   Photometric variability in the ultracool dwarf BRI 0021-0214:: Possible evidence for dust clouds [J].
Martín, EL ;
Osorio, MRZ ;
Lehto, HJ .
ASTROPHYSICAL JOURNAL, 2001, 557 (02) :822-830
12