2003A&A...404..171B

Query : 2003A&A...404..171B

2003A&A...404..171B - Astronomy and Astrophysics, volume 404171-185 (2003/6-2)

The σ Orionis substellar population. VLT/FORS spectroscopy and 2MASS photometry.

BARRADO Y NAVASCUES D., BEJAR V.J.S., MUNDT R., MARTIN E.L., REBOLO R., ZAPATERO OSORIO M.R. and BAILER-JONES C.A.L.

Abstract (from CDS):

VLT/FORS spectroscopy and 2MASS near-infrared photometry, together with previously known data, have been used to establish the membership and the properties of a sample of low-mass candidate members of the σ Orionis cluster with masses spanning from 1M☉ down to about 0.013M☉ (i.e., deuterium-burning mass limit). We have observed K-band infrared excess and remarkably intense Hα emission in various cluster members, which, in addition to the previously detected forbidden emision lines and the presence of Li I in absorption at 6708Å, have allowed us to tentatively classify σ Orionis members as classical or weak-line T Tauri stars and substellar analogs. Variability of the Hα line has been investigated and detected in some objects. Based on the K-band infrared excesses and the intensity of Hα emission, we estimate that the minimum disk frequency of the σ Orionis low-mass population is in the range 5-12%.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: sigma Orionis - stars: low-mass, brown dwarfs

Nomenclature: Table 1: [BMZ2001] S Ori JHHMMSS.s+DDMMSS N=1 added.

Simbad objects: 88

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Number of rows : 88
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 [BZR99] S Ori 46 * 05 36 51.7 -02 32 54           M8.5 4 0
2 [BZR99] S Ori 33 * 05 36 58.0796129568 -02 35 19.475262024         17.08 ~ 12 0
3 [BZR99] S Ori 34 * 05 37 07.2192564048 -02 32 44.240012988         17.10 ~ 5 0
4 [BZR99] S Ori 37 * 05 37 07.6144718784 -02 27 14.997346128         17.49 ~ 4 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 [BZR99] S Ori 19 * 05 37 21.0603854496 -02 25 40.035311436         16.62 ~ 6 0
7 [BZR99] S Ori 40 Or* 05 37 36.4816663032 -02 41 56.713683516   23.22   20.12 17.79 M3.5 20 0
8 [BZR99] S Ori 48 * 05 37 39.0 -02 39 50           ~ 2 0
9 [BMZ2001] S Ori J053746.6-024328 * 05 37 46.6 -02 43 28           ~ 2 0
10 [BZR99] S Ori 23 Y*O 05 37 51.1108853952 -02 26 07.501486812   20.6   19.4 16.88 M6.5 14 0
11 [BZR99] S Ori 35 Y*O 05 37 55.5938374392 -02 33 05.343313356 20.472 23.63   19.40 17.55 M4.5 18 0
12 [BZR99] S Ori 24 Y*O 05 37 55.7464490520 -02 24 33.705030096   23.05 20.54 18.89 17.04 M5.0 11 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 [BZR99] S Ori 44 * 05 38 07.126 -02 43 21.05   22.29 23.54 21.54 19.64 M7 8 0
15 [BZR99] S Ori 13 Y*O 05 38 13.2091054320 -02 24 07.556361588   21.07 19.68 18.06 16.13 M5.5 16 0
16 [BZR99] S Ori 43 * 05 38 13.9590316104 -02 35 01.288893300         18.99 ~ 7 0
17 [BZR99] S Ori 47 BD* 05 38 14.62416 -02 40 15.4020         20.53 L1e 29 0
18 V* V2723 Ori Or* 05 38 17.1808248144 -02 22 25.719885012   22.96 19.21 17.61 15.67 M5.0 18 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 [W96] rJ053820-0237 TT* 05 38 20.2123248864 -02 38 01.667415300   19.07 17.47 16.08 14.27 M4-5e 32 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 [BZR99] S Ori 31 Y*O 05 38 20.8792849368 -02 46 13.332049824         17.25 M4.0 24 0
23 Mayrit 379292 Or* 05 38 21.3850973592 -02 33 36.302074596     20.78 19.47 17.45 M6 18 0
24 [BZR99] S Ori 49 * 05 38 22.9 -02 37 55           M7.5 3 0
25 V* V2729 Ori Or* 05 38 25.57752 -02 48 37.0224   21.09 24.40 22.07 19.54 M8.5V 31 0
26 [BZR99] S Ori 18 Or* 05 38 25.6854086976 -02 31 21.716183784     19.99 18.68 16.59 M3.5 20 0
27 2MASS J05382623-0240413 Or* 05 38 26.2365289464 -02 40 41.397150432   21.25 20.45 19.08 16.99 M4.5 20 0
28 V* V505 Ori TT* 05 38 27.2560402224 -02 45 09.705640104     14.16 13.54 12.85 K7e 65 0
29 Kiso A-0976 329 TT* 05 38 27.5110120944 -02 35 04.225488108 18.90 18.59 17.17 15.92 14.37 M3.5e 42 0
30 Mayrit 803197 Y*O 05 38 28.9705540938 -02 48 47.321425377   25.83 20.83   17.01 M6 21 0
31 [BZR99] S Ori 29 Or* 05 38 29.6185929264 -02 25 14.270648484   21.05 20.72 19.02 17.02 M4.0 21 0
32 [W96] rJ053831-0235 TT* 05 38 31.5873593664 -02 35 15.081924804 19.243 17.17 15.85 14.88 13.77 M0e 31 0
33 [BZR99] S Ori 39 Or* 05 38 32.4445347456 -02 29 57.296432760 21.027 22.98   19.77 17.71 M6.5 19 0
34 [W96] rJ053833-0236 TT* 05 38 34.0608899664 -02 36 37.589513328 19.530   16.39 15.24 13.72 M3-M4e 41 0
35 [BZR99] S Ori 22 Or* 05 38 35.3557024968 -02 25 22.268716356   22.52 20.73 18.91 16.87 M6e 19 0
36 [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
37 [W96] rJ053838-0236 TT* 05 38 38.2273375656 -02 36 38.502644580 17.054 15.35 14.09 13.25 12.38 K8e 31 0
38 Haro 5-13 TT* 05 38 40.2734966736 -02 30 18.558554472 17.937 16.91 15.49 14.48 13.46 M0e 41 0
39 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
40 [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
41 2MASS J05384755-0227120 Y*O 05 38 47.5456806504 -02 27 12.033175788 19.62 19.01 17.53 16.00 14.11 M3.5 30 0
42 [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
43 [W96] 4771-899 TT* 05 38 48.0364463496 -02 27 14.149731420 16.327 14.490 13.254 12.630 11.54 K7e 33 0
44 [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
45 [W96] rJ053849-0238 TT* 05 38 49.1743174560 -02 38 22.302143052 17.35 16.22 14.87 13.93 12.91 M0.5e 27 0
46 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
47 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 25 0
48 [BZR99] S Ori 17 Y*O 05 39 04.4949780000 -02 38 35.381301036     20.00 18.92 16.80 M6 17 0
49 [W96] 4771-1075 TT* 05 39 05.4085005984 -02 32 30.366192804 17.541 15.79 14.42 13.54 12.70 K7e 51 0
50 [BZR99] S Ori 20 Or* 05 39 07.5827704608 -02 29 05.658266004   22.49   19.02 17.03 M5.5 17 0
51 [W96] rJ053907-0228 TT* 05 39 07.5918979680 -02 28 23.408982264 19.14 18.52 16.98 15.79 14.36 M3e 32 0
52 2MASS J05390808-0228447 Y*O 05 39 08.0900406592 -02 28 44.831657458 19.34 19.57 18.69 17.56 15.88 M4.0 20 0
53 [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
54 [BZR99] S Ori 25 Or* 05 39 08.9497481544 -02 39 57.986417520     21.09 19.34 17.02 M6.5V 26 0
55 [KJN2005] 33 Or* 05 39 10.0137047592 -02 28 11.596588608 21.26 20.55 19.01 17.71 16.10 M5 14 0
56 Mayrit 425070 Or* 05 39 11.4017533992 -02 33 32.831052984 21.773 21.52 19.94 18.32 16.43 M5e 37 0
57 [W96] 4771-1038 TT* 05 39 11.6324490456 -02 36 02.883889440 16.242 15.82 14.47 13.61 12.75 K7e 31 0
58 2MASS J05391183-0227409 Y*O 05 39 11.8349306400 -02 27 41.009358564 20.843 19.55 18.04 16.81 15.16 M4.5 23 0
59 2MASS J05391289-0224537 Y*? 05 39 12.8832672840 -02 24 53.463700008   22.75   21.04 18.94 M6 8 0
60 [BZR99] S Ori 30 Y*O 05 39 13.0855893696 -02 37 50.971269108     20.74 19.34 17.30 M6 22 0
61 [BNM2013] 90.02 109 LM* 05 39 14.4706680864 -02 28 33.421367604 20.561 19.11 17.52 16.30 14.82 M3.5e 19 0
62 [BZR99] S Ori 16 Y*O 05 39 15.1041343392 -02 40 47.667633204 20.73 21.97   18.73 16.74 M3.5 15 0
63 [BZR99] S Ori 38 Y*O 05 39 15.2611041000 -02 21 50.711830596   22.96   20.02 17.97 M7 14 0
64 [BZR99] S Ori 26 * 05 39 15.765 -02 38 26.22         17.12 M4.5 8 0
65 2MASS J05392023-0238258 Y*O 05 39 20.2371430800 -02 38 25.948061736 21.41 20.82 18.97 17.45 15.55 M5.5 35 0
66 2MASS J05392044-0227368 TT* 05 39 20.4494141808 -02 27 36.860094396 18.900 17.43 15.93 14.81 13.52 M2e 27 0
67 [BZR99] S Ori 3 LM* 05 39 20.9751873360 -02 30 33.534650772   20.66 19.25 17.58 15.57 ~ 25 0
68 [W96] rJ053923-0233 TT* 05 39 22.8701215704 -02 33 33.120077976 19.264 18.19 16.56 15.47 14.19 M2e 31 0
69 [BZR99] S Ori 28 Or* 05 39 23.1926611128 -02 46 55.782192540   22.63 21.06 19.41 17.23 M5.5 24 0
70 [BZR99] S Ori 42 Y*? 05 39 23.4322728408 -02 40 57.579062268         19.18 M7.5 11 0
71 2MASS J05392633-0228376 Y*O 05 39 26.3370825408 -02 28 37.711621812   19.69 18.02 16.96 15.26 M5 24 0
72 [BMZ2001] S Ori J053926.8-022614 * 05 39 26.7727217568 -02 26 14.336925828   21.76     18.26 ~ 9 0
73 [BZR99] S Ori 36 Or* 05 39 26.8571235120 -02 36 56.236094820   22.73     17.88 M6.5 19 0
74 [BZR99] S Ori 21 Or* 05 39 34.3303193088 -02 38 46.937656932   21.01 21.12 19.27 17.29 ~ 20 0
75 [BMZ2001] S Ori J053936.4-023626 * 05 39 36.4 -02 36 26           ~ 2 0
76 [BZR99] S Ori 14 Or* 05 39 37.5942690888 -02 44 30.504555420   22.39 20.39 18.69 16.71 ~ 17 0
77 [BZR99] S Ori 41 * 05 39 38.4999621504 -02 31 13.326968064 20.695 21.56   20.61 18.69 ~ 8 0
78 [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
79 [BZR99] S Ori 32 Or* 05 39 43.5829405200 -02 47 31.827482016   21.35   19.75 17.59 M6.0 19 0
80 [BZR99] S Ori 11 Y*O 05 39 44.3302873224 -02 33 02.834542764 21.137 20.75 20.11   16.46 M6 16 0
81 [BZR99] S Ori 10 Or* 05 39 44.5055544576 -02 24 43.244819676   23.03 19.76   16.36 ~ 23 0
82 [BMZ2001] S Ori J053946.5-022423 Y*? 05 39 46.453 -02 24 23.06   21.84 23.60   19.74 ~ 7 0
83 [SE2004] 108 * 05 39 48.2648127648 -02 29 14.299216584   25.91   20.78 18.68 M7 12 0
84 2MASS J05394944-0223459 Y*O 05 39 49.4438049576 -02 23 45.965751396   20.21 18.15 16.86 15.12 M4e 24 0
85 Haro 5-30 TT* 05 39 51.7265730336 -02 22 47.261235504   19.33 17.95 16.40 14.64 M5.5e 37 0
86 2MASS J05395825-0226188 Y*O 05 39 58.2508327752 -02 26 18.892878108     16.79 15.75 14.26 M2.1 25 0
87 Haro 5-36 TT* 05 40 01.9558295304 -02 21 32.633754840     16.63 15.46 13.88 M4.5 44 0
88 2MASS J05400525-0230522 Y*O 05 40 05.2553008224 -02 30 52.391019780 22.379 20.75 19.08 17.65 15.86 M5 21 0

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