2006AJ....132..891R

Query : 2006AJ....132..891R

2006AJ....132..891R - Astron. J., 132, 891-901 (2006/August-0)

A search for binary systems among the nearest L dwarfs.

REID I.N., LEWITUS E., ALLEN P.R., CRUZ K.L. and BURGASSER A.J.

Abstract (from CDS):

We have used the Near-Infrared Camera and Multi-Object Spectrometer NIC1 camera on the Hubble Space Telescope to obtain high angular resolution images of 52 ultracool dwarfs in the immediate solar neighborhood. Nine systems are resolved as binary, with component separations from 1.5 to 15 AU. Based on current theoretical models and empirical bolometric corrections, all systems have components with similar luminosities and, consequently, high mass ratios, q>0.8. Limiting analysis to L dwarfs within 20 pc, the observed binary fraction is 12%+7–3. Applying Bayesian analysis to our data set, we derive a mass-ratio distribution that peaks strongly at unity. Modeling the semimajor axis distribution as a logarithmic Gaussian, the best fit is centered at loga0=0.8 AU (∼6.3 AU), with a (logarithmic) width of ±0.3. The current data are consistent with an overall binary frequency of ∼24%.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: Visual - Stars: Low-Mass, Brown Dwarfs

VizieR on-line data: <Available at CDS (J/AJ/132/891): table1.dat table23.dat table4.dat>

Nomenclature: Tables 2, 4: [RLA2006] 2MASS JHHMMSSss+DDMMSSs A N=9x2 + 4x2.

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME L 362-29 BC BD* 00 04 34.8671722377 -40 44 06.463544237       19.61 16.88 L5+L5 111 0
2 2MASSI J0025036+475919 BD* 00 25 03.65928 +47 59 19.1868           L4: 24 0
3 LSPM J0036+1821 BD* 00 36 16.1118891182 +18 21 10.286665966       18.451 16.053 L3.5 213 0
4 2MASS J00452143+1634446 BD* 00 45 21.4152609704 +16 34 44.736014164           L2beta 65 0
5 2MASS J01075242+0041563 BD* 01 07 52.42200 +00 41 56.3964           L8 55 0
6 SSSPM J0124-4240 BD* 01 23 59.0684407344 -42 40 07.179073284   18.0 19.0 19.41 16.28 L0.5 15 0
7 SIPS J0147-4954 LM* 01 47 32.8099692192 -49 54 47.920962312           M8+L2 16 0
8 2MASS J01550354+0950003 BD* 01 55 03.5501844443 +09 50 00.395365641           L4 19 0
9 DENIS J020529.0-115925 BD* 02 05 29.3651195393 -11 59 29.721210536           L7V 150 0
10 2MASS J02132880+4444453 BD* 02 13 28.7932328280 +44 44 45.217640112           L1.5 25 0
11 2MASS J03140344+1603056 BD* 03 14 03.4425221520 +16 03 05.472278460           L0 34 0
12 2MASS J03552337+1133437 BD* 03 55 23.3735910810 +11 33 43.797034332           L5gamma 113 0
13 2MASSI J0423485-041403 BD* 04 23 48.5763811987 -04 14 03.246502948           L6.5+T2 125 0
14 2MASS J04291842-3123568 LM* 04 29 18.4672536672 -31 23 56.743066104       16.2   M7.5 29 0
15 2MASS J04390101-2353083 BD* 04 39 01.0048450008 -23 53 08.495187288           L4.5 42 0
16 2MASS J04455387-3048204 BD* 04 45 53.8961437699 -30 48 20.648826383           L2 32 0
17 2MASS J05002100+0330501 BD* 05 00 21.0116447403 +03 30 50.081620281           L4pec 39 0
18 2MASS J05233822-1403022 BD* 05 23 38.2236232872 -14 03 02.017758240           L2.5 64 0
19 2MASS J06244595-4521548 BD* 06 24 45.9449286065 -45 21 54.758014875         18.32 L6.5 40 0
20 2MASS J06523073+4710348 BD* 06 52 30.7182715296 +47 10 34.926594456           L3.5+L6.5 40 0
21 2MASS J07003664+3157266 BD* 07 00 36.7233300485 +31 57 25.462866965           L3+L6.5 45 0
22 LSPM J0746+2000 BD* 07 46 42.50553 +20 00 31.9757       17.9 15.034 L0+L1.5 184 1
23 2MASSI J0825196+211552 BD* 08 25 19.6125672818 +21 15 51.549358145       21.97 19.22 L7.5V 123 0
24 2MASS J08354256-0819237 BD* 08 35 42.5314423948 -08 19 23.372129099           L6.5 67 0
25 SIPS J0847-1532 BD* 08 47 28.7413750872 -15 32 37.370330484           L1.5 38 0
26 2MASS J09083803+5032088 BD* 09 08 38.0091771633 +50 32 08.205341214           L8 46 0
27 2MASS J09111297+7401081 BD* 09 11 12.9672916656 +74 01 08.135608260           L0 17 0
28 2MASS J09153413+0422045 BD* 09 15 34.13712 +04 22 04.5948           L6 35 0
29 SIPS J0921-2104 BD* 09 21 14.1068893303 -21 04 44.417691256         16.50 L1 48 0
30 2MASS J10452400-0149576 BD* 10 45 23.9815317869 -01 49 57.762869076       18.797 16.509 L1 45 0
31 LSPM J1048+0111 BD* 10 48 42.8144208091 +01 11 58.221081965       19.4   L1 55 0
32 2MASS J10511900+5613086 BD* 10 51 18.9925605455 +56 13 08.676242585           L2 23 0
33 2MASS J11040127+1959217 BD* 11 04 01.2774943824 +19 59 21.714139176           L4 41 0
34 LSPM J1108+6830 BD* 11 08 30.7737005711 +68 30 16.720164401       19.3 16.6 L1e 35 0
35 2MASS J12130336-0432437 BD* 12 13 03.3425411711 -04 32 43.748365858           L4.2V 25 0
36 2MASS J12212770+0257198 BD* 12 21 27.7124211648 +02 57 19.767907440           L0.5 42 0
37 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 254 0
38 2MASS J14283132+5923354 BD* 14 28 31.3087124280 +59 23 35.426100264           L4.4V 22 0
39 2MASS J14482563+1031590 BD* 14 48 25.6387285440 +10 31 59.065957704   24.79 23.31     L5.5 31 1
40 2MASSW J1507476-162738 BD* 15 07 47.6758255542 -16 27 40.113982846     22.136 18.928 16.579 L5V 199 0
41 2MASS J15394189-0520428 BD* 15 39 41.9238250231 -05 20 42.754120152         17.47 L4.2V 41 0
42 2MASS J15525906+2948485 BD* 15 52 59.0614076832 +29 48 48.581774604           L0e 38 0
43 LSPM J1658+7027 BD* 16 58 03.8028228991 +70 27 01.695233449       19.0   L1(e) 41 0
44 2MASS J17054834-0516462 BD* 17 05 48.3505962528 -05 16 46.349087556         16.55 L1 48 0
45 2MASS J17072343-0558249 ** 17 07 23.43528 -05 58 24.9204       18.9 15.38 M9+L3 31 0
46 LSPM J1731+2721 BD* 17 31 29.7424777776 +27 21 23.240407320   20.1   17.6 14.9 L0 46 0
47 SIPS J1753-6559 BD* 17 53 45.1859814950 -65 59 55.666877515         17.80 L4 30 0
48 2MASS J18071593+5015316 BD* 18 07 15.9375533592 +50 15 31.636789740           L1 43 0
49 SIPS J1936-5502 BD* 19 36 01.8856788584 -55 02 32.189687017           L4 21 0
50 2MASS J20575409-0252302 BD* 20 57 54.0936475128 -02 52 30.247487652           L1 63 0
51 2MASS J21041491-1037369 BD* 21 04 14.9650401063 -10 37 37.351594861           L2 53 0
52 2MASS J21522609+0937575 BD* 21 52 26.09064 +09 37 57.5328           L6+L6 22 0
53 2MASSW J2224438-015852 BD* 22 24 43.8544128559 -01 58 53.284975671           L4.5V 139 0
54 2MASS J22521073-1730134 BD* 22 52 10.7512306563 -17 30 13.889743018         17.9 L4.5+T3.5 56 0
55 2MASSI J2325453+425148 BD* 23 25 45.3034346736 +42 51 48.360303216           L8 20 0
56 SSSPM J2352-2538 LM* 23 51 50.4633005025 -25 37 36.861356975           M9e 44 0

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