2006MNRAS.369..272O

Query : 2006MNRAS.369..272O

2006MNRAS.369..272O - Mon. Not. R. Astron. Soc., 369, 272-280 (2006/June-2)

Circumstellar discs in the young σ Orionis cluster.

OLIVEIRA J.M., JEFFRIES R.D., VAN LOON J.T. and RUSHTON M.T.

Abstract (from CDS):

We present new K- and L'-band imaging observations for members of the young (3-5Myr) σOrionis cluster, obtained at the United Kingdom Infrared Telescope (UKIRT) with the UKIRT 1-5 micron Imager Spectrometer (UIST). We determine (K - L') colour excesses with respect to the photospheres, finding evidence for warm circumstellar dust around 27 out of 83 cluster members that have masses between 0.04 and 1.0M☉. This indicates a circumstellar disc frequency of at least (33±6) per cent for this cluster, consistent with previous determinations from smaller samples and also consistent with the 3-Myr disc half-life suggested by Haisch et al. There is marginal evidence that the disc frequency declines towards lower masses, but the data are also consistent with no mass dependence at all. There is no evidence for spatial segregation of objects with and without circumstellar discs.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): circumstellar matter - stars: low-mass, brown dwarfs - stars: pre-main-sequence - open clusters and associations: individual: σ Orionis - infrared: stars

Nomenclature: Table 1: [OJV2006] NN (Nos 1-59).

Simbad objects: 63

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Number of rows : 63
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 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
3 ATO J084.1212-02.5967 Y*O 05 36 29.0964262776 -02 35 48.219498744   17.47 15.97 14.94 13.76 ~ 16 0
4 2MASS J05364691-0233282 Or* 05 36 46.9166638560 -02 33 28.359665568   20.07 18.45 17.02 15.27 ~ 11 0
5 2MASS J05371515-0242015 Y*O 05 37 15.1566786264 -02 42 01.653717564   19.64 18.12 16.85 15.23 M4e 10 0
6 2MASS J05372426-0219075 TT* 05 37 24.2762051688 -02 19 07.591908540   16.18 14.74 13.77 12.78 M1.0 9 0
7 2MASS J05372761-0257100 Or* 05 37 27.6240368160 -02 57 10.041207732   22.70 20.34 18.86 17.03 ~ 8 0
8 2MASS J05375031-0212247 Or* 05 37 50.3167718496 -02 12 24.761897604   20.25 18.56 17.20 15.53 ~ 9 0
9 UCAC2 30799972 TT* 05 37 51.6115361832 -02 35 25.689580476 18.636   15.64 14.56 13.34 M2.0 33 0
10 2MASS J05375210-0256551 Or* 05 37 52.1053616832 -02 56 55.170167064   20.20 18.58 17.10 15.24 ~ 12 0
11 2MASS J05375404-0244407 TT* 05 37 54.0484860384 -02 44 40.720129764   18.58 17.07 15.90 14.48 M3.0 23 0
12 2MASS J05375613-0209266 Or* 05 37 56.1345981792 -02 09 26.671509036   20.64 18.92 17.49 15.68 ~ 14 0
13 [BZR99] S Ori 12 Or* 05 37 57.4587695400 -02 38 44.468902788   20.61 19.81 18.15 16.42 M4.5/6V 33 0
14 Kiso A-0976 316 TT* 05 38 08.2658566896 -02 35 56.276354400 18.050   16.19 15.08 13.76 M2.5 40 0
15 2MASS J05381012-0254506 Or* 05 38 10.1191270848 -02 54 50.757653664   23.02 20.02 18.39 16.44 M5.0 11 0
16 2MASS J05381330-0251329 Or* 05 38 13.3087143912 -02 51 33.078206052   22.42 20.18 18.57 16.59 M5.0 12 0
17 2MASS J05381610-0238049 Or* 05 38 16.1012119584 -02 38 04.982674128 20.46 19.65 18.09 16.77 15.09 M3.5 25 0
18 V* V2722 Ori Or* 05 38 16.9885650816 -02 14 46.450945428       17.58 16.057 ~ 16 0
19 2MASS J05381741-0240242 Or* 05 38 17.4145740552 -02 40 24.296790180   23.24   19.21 17.09 M5/7V 26 0
20 Kiso A-0976 326 TT* 05 38 18.8587986024 -02 51 38.946956472   18.20 16.81 15.65 14.25 M2.5 36 0
21 [W96] rJ053820-0234 TT* 05 38 20.5029803016 -02 34 08.974652808   20.99 19.39 17.68 15.74 M4e 37 0
22 2MASS J05382332-0244142 Or* 05 38 23.3264911464 -02 44 14.244108288 20.38 19.75 18.18 16.84 15.12 M4.0 22 0
23 V* V2726 Ori Or* 05 38 23.5917044904 -02 20 47.597296344   19.81 18.64 17.14 15.32 M5.5 26 0
24 2MASS J05382364-0301331 Y*O 05 38 23.6683530264 -03 01 33.626956332   18.08 16.57 15.42 14.04 ~ 8 0
25 [W96] rJ053833-0236 TT* 05 38 34.0608899664 -02 36 37.589513328 19.530   16.39 15.24 13.72 M3-M4e 41 0
26 [BZR99] S Ori 22 Or* 05 38 35.3557024968 -02 25 22.268716356   22.52 20.73 18.91 16.87 M6e 19 0
27 [W96] 4771-1097 TT* 05 38 35.8728104976 -02 30 43.337476944 16.679 15.13 13.94 13.18 12.41 K6e 30 0
28 [BNM2013] 93.03 22 LM* 05 38 36.6927137808 -02 44 13.727328324 19.83 19.11 17.55 16.13 14.33 M2.6 29 0
29 2MASS J05383794-0205524 Y*O 05 38 37.9429603653 -02 05 52.592573238   16.90 15.48 14.53 13.50 ~ 4 0
30 2MASS J05383858-0241558 Or* 05 38 38.5944218448 -02 41 55.925390112 20.86 21.50 19.80 18.31 16.42 M5.5e 39 0
31 2MASS J05383981-0256462 TT* 05 38 39.8185491423 -02 56 46.235837610   15.98 14.62 13.71 12.76 K7.5 19 0
32 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
33 [W96] 4771-1051 TT* 05 38 44.2345372944 -02 40 19.771649184 15.88 15.24 14.02 13.22 12.41 K7.5/8e 42 0
34 2MASS J05384449-0240305 Or* 05 38 44.4967508136 -02 40 30.571322556 20.10 19.26 17.75 16.51 14.91 ~ 21 0
35 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 855 0
36 Mayrit 1316178 Or* 05 38 47.1460165104 -02 57 55.746751320   19.50 21.15   16.83 M6.5 14 0
37 [BZR99] S Ori 6 Or* 05 38 47.6632499544 -02 30 37.481740308 20.977 20.25   17.30 15.38 M5.5 23 0
38 [W96] rJ053847-0237 TT* 05 38 47.91648 -02 37 19.2360 16.81 16.78 15.51 15.01 13.39 M1.0 29 0
39 [BZR99] S Ori 15 Or* 05 38 48.0991320696 -02 28 53.682649428 21.11 21.32 19.89 18.32 16.42 M5.5e 26 0
40 V* V2737 Ori Or* 05 38 49.2830405880 -02 23 57.624853740 22.321 23.90 19.39 17.67 16.90 M3.8V 27 0
41 2MASS J05385060-0242429 Or* 05 38 50.6088010368 -02 42 42.960276072   21.04 19.42 17.80 15.85 ~ 24 0
42 [BNM2013] 90.02 362 LM* 05 38 50.7819191472 -02 36 26.805329712 18.816 18.76   16.98 15.12 M3.0 21 0
43 Mayrit 799173 Or* 05 38 51.0027441768 -02 49 14.013646320   21.72 20.04 18.58 16.75 ~ 13 0
44 [W96] rJ053852-0238 LM* 05 38 53.0748520464 -02 38 53.714969592 17.35 16.30 14.82 13.83 12.75 M1.0 14 0
45 2MASS J05385492-0228583 Or* 05 38 54.9292657368 -02 28 58.375755156 21.05 20.21 18.61 17.22 15.48 M4.5 43 0
46 ZTF J053858.55-021527.8 BY* 05 38 58.5548728776 -02 15 27.824663916   17.90 16.44 15.30 13.97 M1.9 15 0
47 2MASS J05390115-0236388 Or* 05 39 01.1575458936 -02 36 38.885743908 19.061 19.45 18.04 16.70 15.11 ~ 22 0
48 2MASS J05390276-0229558 TT* 05 39 02.7719014080 -02 29 55.865251140 19.981 18.56 16.98 15.76 14.21 M4.0 31 0
49 2MASS J05390524-0233005 Or* 05 39 05.2462706112 -02 33 00.594522684 20.41 19.36 17.89 16.58 14.97 ~ 22 0
50 [BZR99] S Ori 7 Y*O 05 39 08.2185362880 -02 32 28.467592548 20.85 20.61 19.10 17.55 15.70 M5-M5.5 23 0
51 CVSO 1858 RS* 05 39 08.5276398024 -02 51 46.580715792   16.64 15.23 14.21 13.23 M0.5 22 0
52 Mayrit 425070 Or* 05 39 11.4017533992 -02 33 32.831052984 21.773 21.52 19.94 18.32 16.43 M5e 37 0
53 [BZR99] S Ori 3 LM* 05 39 20.9751873360 -02 30 33.534650772   20.66 19.25 17.58 15.57 ~ 25 0
54 2MASS J05393378-0220398 TT* 05 39 33.7864077936 -02 20 39.889265784   17.19 15.74 14.73 13.64 M1.0 22 0
55 [BZR99] S Ori 21 Or* 05 39 34.3303193088 -02 38 46.937656932   21.01 21.12 19.27 17.29 ~ 20 0
56 [BZR99] S Ori 14 Or* 05 39 37.5942690888 -02 44 30.504555420   22.39 20.39 18.69 16.71 ~ 17 0
57 [BZR99] S Ori 4 Y*O 05 39 39.3176659728 -02 32 25.331200404 20.429 20.35 18.78 17.34 15.52 ~ 19 0
58 Haro 5-25 TT* 05 39 39.3780952152 -02 17 04.499525544   16.95 15.35 14.29 13.24 M0.0 42 0
59 2MASS J05394299-0213333 Or* 05 39 42.9942578664 -02 13 33.331805076   20.17 18.58 17.25 15.56 ~ 14 0
60 [BZR99] S Ori 10 Or* 05 39 44.5055544576 -02 24 43.244819676   23.03 19.76   16.36 ~ 23 0
61 2MASS J05394944-0223459 Y*O 05 39 49.4438049576 -02 23 45.965751396   20.21 18.15 16.86 15.12 M4e 24 0
62 2MASS J05395056-0234137 Or* 05 39 50.5623676008 -02 34 13.783179504     18.39 17.14 15.24 ~ 20 0
63 2MASS J05403249-0240598 * 05 40 32.4928174200 -02 40 59.914414704         17.014 ~ 8 0

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