2004MNRAS.354..466K

Query : 2004MNRAS.354..466K

2004MNRAS.354..466K - Mon. Not. R. Astron. Soc., 354, 466-476 (2004/October-3)

A search for short time-scale JHK variability in ultracool dwarfs.

KOEN C., MATSUNAGA N. and MENZIES J.

Abstract (from CDS):

The results of continuous monitoring, with typical durations of 2-4 h, of 18 L and T dwarfs are presented. Measurements were made simultaneously in JHKS, with a typical time resolution of about 10 min. Limits on the variability are well below 0.02 mag in all cases except for the faintest object. There are none the less a few dwarfs in which we may have observed variability: the same patterns of very low-level activity seemed to be present in the data for more than one filter. Simultaneous frequency-domain analysis of the J, H and KS data furthermore hints at a very short period (0.8-1.6 h) in a few objects. We also present a brief assessment of some of the variability test statistics that have been used in the field of ultracool dwarf variability.

Abstract Copyright: 2004 RAS

Journal keyword(s): stars: low-mass, brown dwarfs - stars: variables: other

CDS comments: table 1: SDSS 2028+0052 = 2MASS J20282035+0052265

Simbad objects: 21

goto Full paper

goto View the references in ADS

Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASSW J1145572+231730 BD* 11 45 57.1458774144 +23 17 29.661415260           L1.5V 33 0
2 2MASS J11553952-3727350 BD* 11 55 39.5361849740 -37 27 35.503012522           L2e 47 0
3 2MASS J12255432-2739466 BD* 12 25 54.32328 -27 39 46.6776           T5.5+T8 67 0
4 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 167 0
5 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 267 0
6 2MASS J13233597-1806379 BD* 13 23 35.9696652432 -18 06 37.951163460           L0.0V 10 0
7 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
8 2MASS J15031961+2525196 BD* 15 03 19.6109033841 +25 25 19.795679019           T5.5 84 0
9 2MASSI J1534498-295227 BD* 15 34 49.84080 -29 52 27.4188           T4.5+T5 73 0
10 2MASSI J1546271-332511 BD* 15 46 27.18600 -33 25 11.1828           T5.7 34 1
11 2MASS J15530228+1532369 BD* 15 53 02.28072 +15 32 36.9132           T6.5+T7.5 63 0
12 GJ 618.1 B BD* 16 20 26.1629452420 -04 16 31.694082465         18.49 L2.4V 29 0
13 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 162 0
14 2MASS J20282035+0052265 BD* 20 28 20.3489639184 +00 52 26.588682516           L2.5 43 0
15 2MASS J21041491-1037369 BD* 21 04 14.9650401063 -10 37 37.351594861           L2 58 0
16 SIPS J2130-0845 BD* 21 30 44.6489028062 -08 45 20.574092550       19.784 17.351 L1 51 1
17 2MASSI J2158045-155009 BD* 21 58 04.5716969232 -15 50 09.793729140       20.771 18.582 L4 59 0
18 * eps Ind PM* 22 03 21.6536261624 -56 47 09.522795714   5.75 4.69     K5V 616 0
19 * eps Ind B BD* 22 04 10.5951812451 -56 46 58.239102418     24.12 20.8 15.60 T1V+T6V 176 1
20 2MASSW J2206450-421721 BD* 22 06 45.0009530760 -42 17 21.139647720       21.485 19.034 L2V 40 1
21 2MASSW J2224438-015852 BD* 22 24 43.8544128559 -01 58 53.284975671           L4.5V 150 0

To bookmark this query, right click on this link: simbad:objects in 2004MNRAS.354..466K and select 'bookmark this link' or equivalent in the popup menu