2011MNRAS.418.1231D

Query : 2011MNRAS.418.1231D

2011MNRAS.418.1231D - Mon. Not. R. Astron. Soc., 418, 1231-1237 (2011/December-1)

New brown dwarfs in the south part of the upper Scorpius association.

DAWSON P., SCHOLZ A. and RAY T.P.

Abstract (from CDS):

This paper presents the results of a search for brown dwarfs in the Upper Scorpius Association using data from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey. Candidate young brown dwarfs were first chosen by their position in colour magnitude diagrams with further selection based on proper motions to ensure Upper Scorpius membership. Proper motions were derived by comparing UKIDSS and Two Micron All Sky Survey (2MASS) data. Using that method we identify 19 new brown dwarfs in the southern part of the association. In addition there are up to eight likely members with slightly higher dispersion velocity. The ratio of brown dwarfs to stars was found to be consistent with other areas in Upper Scorpius. It was also found to be similar to other results from young clusters with OB associations, and lower than those without, suggesting the brown dwarf formation rate may be a function of environment.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): techniques: photometric - open clusters and associations: individual: Upper Scorpius - infrared: stars

VizieR on-line data: <Available at CDS (J/MNRAS/418/1231): table1.dat table2.dat>

Simbad objects: 42

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Number of rows : 42
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 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
5 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
6 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
7 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 887 0
8 UGCS J154723.32-272907.3 BD* 15 47 23.32656 -27 29 07.3392           L0-L3 2 0
9 2MASS J15481934-2748512 BD? 15 48 19.3503350664 -27 48 51.140424024           ~ 1 0
10 2MASS J15485777-2837332 LM* 15 48 57.7838999736 -28 37 33.297817692           M8.25 6 0
11 2MASS J15490803-2839550 LM* 15 49 08.0431059696 -28 39 55.152247284           M5.3 6 0
12 2MASS J15492508-2843527 Or* 15 49 25.0865697360 -28 43 52.821914052           M2.0e 10 0
13 2MASS J15492909-2815384 LM* 15 49 29.0920502208 -28 15 38.479806756           M6.5 11 0
14 2MASS J15493660-2815141 LM* 15 49 36.6023154312 -28 15 14.194708488           M6.0 11 0
15 2MASS J15501958-2805237 LM* 15 50 19.5832909632 -28 05 23.763884316           M6.7 11 0
16 2MASS J15502934-2835535 LM* 15 50 29.3430721104 -28 35 53.566285920           M5V 4 0
17 2MASS J15504920-2900030 LM* 15 50 49.1476883304 -29 00 03.359039328           M3.4 2 0
18 2MASS J15530915-2828366 PM* 15 53 09.1572500544 -28 28 36.788016792           ~ 2 0
19 2MASS J15531698-2756369 BD? 15 53 16.9884623376 -27 56 37.006377396           ~ 7 0
20 2MASS J15544486-2843078 LM* 15 54 44.8615087704 -28 43 07.763640528           M6.1 10 0
21 2MASS J15551768-2856579 LM* 15 55 17.6820432888 -28 56 57.941057148           M2.6 2 0
22 2MASS J15551960-2751207 LM* 15 55 19.5997590048 -27 51 20.788707132           M7.4 10 0
23 2MASS J15552513-2801085 BD? 15 55 25.0864700928 -28 01 09.025021776           ~ 1 0
24 2MASS J15582376-2721435 LM* 15 58 23.7696510648 -27 21 43.569552816           M5.6 15 0
25 2MASS J15583064-2802357 LM* 15 58 30.6422572800 -28 02 35.757734496           M6V 5 0
26 2MASS J15583403-2803243 BD? 15 58 34.0352125776 -28 03 24.372648180           ~ 5 0
27 2MASS J15585793-2758083 BD? 15 58 57.9345901824 -27 58 08.338191276           ~ 6 0
28 2MASS J15591513-2840411 LM* 15 59 15.1274466144 -28 40 41.168500392           M5.7 10 0
29 2MASS J16005265-2812087 LM* 16 00 52.6593295560 -28 12 08.787804624           M6.8 13 0
30 2MASS J16035573-2738248 BD? 16 03 55.7368596528 -27 38 24.855846828           ~ 4 0
31 2MASS J16035601-2743335 LM* 16 03 56.0114502672 -27 43 33.540487932           M3.7 2 0
32 2MASS J16035915-2806086 LM* 16 03 58.7535299976 -28 06 08.796381660           ~ 3 0
33 2MASS J16051544-2802520 * 16 05 15.4433690880 -28 02 51.874568772           M8.75 4 0
34 2MASS J16062870-2856580 LM* 16 06 28.7053288032 -28 56 58.064257536           M5.2 8 0
35 2MASS J16090168-2740521 LM* 16 09 01.6877834088 -27 40 52.175530452           M6.9 21 0
36 2MASS J16101316-2856308 LM* 16 10 13.1632237368 -28 56 30.772153284           M8.0 14 0
37 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
38 2MASS J16145936-2826214 BD? 16 14 59.3677426488 -28 26 21.525303516           ~ 1 0
39 2MASS J16151681-2907007 PM* 16 15 16.8133683624 -29 07 00.907607496           ~ 1 0
40 2MASS J16190983-2831390 LM* 16 19 09.8339733984 -28 31 39.207510552           M8.5V 3 0
41 2MASS J16192399-2818374 BD? 16 19 23.9909830032 -28 18 37.509043392           ~ 10 0
42 2MASS J16195827-2832276 BD* 16 19 58.2552026064 -28 32 28.013292384           L0.8 11 0

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