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