CDS

2009A&A...493..931B

Query : 2009A&A...493..931B

2009A&A...493..931B - Astronomy and Astrophysics, volume 493, 931-946 (2009/1-3)

A deep look into the cores of young clusters. I. σ-Orionis.

BOUY H., HUELAMO N., MARTIN E.L., MARCHIS F., BARRADO Y NAVASCUES D., KOLB J., MARCHETTI E., PETR-GOTZENS M.G., STERZIK M., IVANOV V.D., KOEHLER R. and NUERNBERGER D.

Abstract (from CDS):

Nearby young clusters are privileged places to study the star formation history. Over the last decade, the σ-Orionis cluster has been a prime location for the study of young very low mass stars, substellar and isolated planetary mass objects and the determination of the initial mass function. To extend previous studies of this association to its core, we searched for ultracool members and new multiple systems within the 1.5'x1.5' central region of the cluster. We obtained deep multi-conjugate adaptive optics (MCAO) images of the core of the σ-Orionis cluster with the prototype MCAO facility MAD at the VLT using the H and Ks filters. These images allow us to detect companions fainter by ΔH ≃5mag as close as 0.2" on a typical source with H=14.5mag. These images were complemented by archival SofI Ks-band images and Spitzer IRAC and MIPS mid-infrared images We report the detection of 2 new visual multiple systems, one being a candidate binary proplyd and the other one a low mass companion to the massive star σ Ori E. Of the 36 sources detected in the images, 25 have a H-band luminosity lower than the expected planetary mass limit for members, and H-Ks color consistent with the latest theoretical isochrones. Nine objects have additional Spitzer photometry and spectral energy distribution consistent with them being cluster members. One of them has a spectral energy distribution from H to 3.6 µm consistent with that of a 5.5MJup cluster member. Complementary NTT/SofI and Spitzer photometry allow us to confirm the nature and membership of two L-dwarf planetary mass candidates.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: low-mass, brown dwarfs - stars: planetary system - techniques: high angular resolution - stars: early-type

VizieR on-line data: <Available at CDS (J/A+A/493/931): table3.dat table8.dat>

Nomenclature: Fig. 2, Table 3: [BHM2009] SigOri-MAD-NN (Nos 1-36). Table 8: [BHM2009] SigOri-SofI-NNN (Nos 1-398).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 78

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Number of rows : 78
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 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 47 0
2 2MASS J05383335-0236176 Y*O 05 38 33.3605595192 -02 36 17.684774892 18.08 17.30 15.83 14.72 13.40 M2.5 18 0
3 [W96] rJ053833-0236 TT* 05 38 34.0608899664 -02 36 37.589513328 19.530   16.39 15.24 13.72 M3-M4e 34 0
4 2MASS J05383687-0236432 Y*O 05 38 36.8794609584 -02 36 43.316502912   19.36 18.18 16.76 14.89 M4.5 14 0
5 [W96] rJ053838-0236 LM* 05 38 38.2273375656 -02 36 38.502644580 17.054 15.35 14.09 13.25 12.38 K8e 24 0
6 [W96] 4771-1147 Y*O 05 38 38.4905614800 -02 34 55.095652092 15.117 13.49 12.35 11.73 10.97 K2.0 24 0
7 2MASS J05384053-0233275 Y*O 05 38 40.5374992824 -02 33 27.596596968 19.58 18.95 17.65 16.28 14.52 M2.8 19 0
8 DENIS J053841.2-023737 * 05 38 41.2343533488 -02 37 37.751237472         17.55 ~ 11 1
9 UCAC2 30800097 TT* 05 38 41.2928547432 -02 37 22.626301404 16.93 15.86 14.54 14.192 12.78 M0.0 25 0
10 [BNM2013] 92.01 23 LM* 05 38 41.3591638344 -02 36 44.554940316   17.76   15.86 14.45 M2.0 14 0
11 2MASS J05384146-0235523 LM* 05 38 41.462 -02 35 52.31       18.57 16.15 ~ 9 0
12 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 563 0
13 2MASS J05384227-0237147 TT* 05 38 42.2801182536 -02 37 14.821687344 17.36 16.69 15.27 14.27 13.22 M0.5 27 0
14 [HHM2007] 683 LM* 05 38 42.3945936408 -02 36 04.524810768       17.75 15.685 ~ 9 0
15 2MASS J05384301-0236145 Y*O 05 38 43.0201961184 -02 36 14.636669328 12.79 14.23 14.87 14.28 13.30 M1.0 15 0
16 [FPS2006] NX 77 X 05 38 43.5 -02 34 50           ~ 3 0
17 [W96] rJ053843-0233 LM* 05 38 43.5573033864 -02 33 25.441109640 17.743 16.52 15.14 14.16 13.07 M1 19 0
18 2MASS J05384359-0236238 * 05 38 43.5963651768 -02 36 23.842829412           ~ 1 0
19 2MASS J05384386-0237068 TT* 05 38 43.8691779528 -02 37 06.911503896 13.559   17.93 16.59 14.80 ~ 27 0
20 [BHM2009] SigOri-MAD-2 NIR 05 38 43.90 -02 36 01.5           ~ 2 0
21 [BHM2009] SigOri-MAD-4 * 05 38 44.10 -02 36 04.4           ~ 1 0
22 * sig Ori C Y*? 05 38 44.1189397296 -02 36 06.310060884   8.77 8.79   9.63 A2Vn 29 0
23 [BHM2009] SigOri-MAD-5 NIR 05 38 44.20 -02 36 12.7           ~ 1 0
24 2MASS J05384454-0235349 * 05 38 44.5483883304 -02 35 35.066954868           ~ 2 0
25 [BHM2009] SigOri-MAD-7 NIR 05 38 44.60 -02 36 18.7           ~ 1 0
26 * 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) 794 0
27 [BHM2009] SigOri-MAD-9 NIR 05 38 44.80 -02 35 57.1           ~ 2 0
28 2MASS J05384480-0233576 Y*O 05 38 44.8065462984 -02 33 57.709150056 14.82 13.73 12.49 11.77 11.11 G5.0 12 0
29 [BHM2009] SigOri-MAD-8 NIR 05 38 44.81 -02 35 56.9           ~ 3 0
30 NAME sig Ori IRS 1 * 05 38 44.9 -02 35 57           ~ 15 0
31 [BHM2009] SigOri-MAD-10 NIR 05 38 45.00 -02 36 15.4           ~ 1 0
32 [BHM2009] SigOri-MAD-11 NIR 05 38 45.20 -02 35 57.7           ~ 1 0
33 [BHM2009] SigOri-MAD-13 NIR 05 38 45.20 -02 35 51.5           ~ 1 0
34 [BHM2009] SigOri-MAD-12 NIR 05 38 45.20 -02 35 44.0           ~ 1 0
35 Mayrit 89175 LM* 05 38 45.2785320048 -02 37 29.322067548     18.77 17.10 15.35 ~ 12 0
36 Mayrit 21023 * 05 38 45.3035699832 -02 35 41.253591372         14.7 ~ 7 0
37 UGCS J053845.61-023529.4 * 05 38 45.6250971384 -02 35 29.429663892           ~ 1 0
38 * sig Ori D Y*O 05 38 45.6253355112 -02 35 58.894678824 5.7 6.51 6.69   6.98 B2V 59 0
39 [BHM2009] SigOri-MAD-16 NIR 05 38 45.70 -02 35 38.4           ~ 1 0
40 [BHM2009] SigOri-MAD-17 NIR 05 38 45.70 -02 35 23.7           ~ 1 0
41 [BHM2009] SigOri-MAD-18 NIR 05 38 45.80 -02 36 13.5           ~ 1 0
42 [BHM2009] SigOri-MAD-19 NIR 05 38 45.90 -02 35 26.7           ~ 1 0
43 [BHM2009] SigOri-MAD-20 NIR 05 38 46.00 -02 35 57.1           ~ 1 0
44 [BHM2009] SigOri-MAD-22 NIR 05 38 46.40 -02 36 00.7           ~ 1 0
45 [BHM2009] SigOri-MAD-21 NIR 05 38 46.40 -02 35 49.7           ~ 1 0
46 2MASS J05384652-0235479 PM* 05 38 46.5210764760 -02 35 48.101962740           ~ 3 0
47 [BHM2009] SigOri-MAD-24 NIR 05 38 46.70 -02 36 18.3           ~ 1 0
48 [BHM2009] SigOri-MAD-26 NIR 05 38 46.80 -02 36 06.2           ~ 1 0
49 [BNM2013] 90.02 216 LM* 05 38 46.8532193544 -02 36 43.607139732 13.332 15.86 16.63 16.61 15.20 M5.0 17 0
50 2MASS J05384689-0236240 * 05 38 46.8749229768 -02 36 24.307929468           ~ 1 0
51 [BHM2009] SigOri-MAD-27 NIR 05 38 47.00 -02 35 58.7           ~ 1 0
52 [BHM2009] SigOri-MAD-30 NIR 05 38 47.10 -02 36 05.6           ~ 1 0
53 [BHM2009] SigOri-MAD-28 NIR 05 38 47.10 -02 35 53.8           ~ 1 0
54 [BHM2009] SigOri-MAD-29 NIR 05 38 47.10 -02 35 51.9           ~ 1 0
55 [W96] pJ053847-0234 TT* 05 38 47.1886997424 -02 34 36.917448204 17.17 18.43 17.36 16.38 14.81 M4.0 20 0
56 [BHM2009] SigOri-MAD-31 NIR 05 38 47.20 -02 36 05.4           ~ 1 0
57 [BHM2009] SigOri-MAD-32 NIR 05 38 47.20 -02 35 50.5           ~ 1 0
58 * sig Ori E Y*O 05 38 47.2050040320 -02 35 40.521424812 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 453 0
59 [BHM2009] SigOri-MAD-33 NIR 05 38 47.30 -02 36 00.8           ~ 1 0
60 UCAC4 438-011202 TT* 05 38 47.4634997136 -02 35 25.322448264 12.01 14.96 14.82 15.071 13.10 M0.5 20 0
61 [W96] rJ053847-0237 TT* 05 38 47.91648 -02 37 19.2360 16.81 16.78 15.51 15.01 13.39 M1.0 24 0
62 [BHM2009] SigOri-MAD-35 NIR 05 38 48.00 -02 35 52.4           ~ 1 0
63 [BHM2009] SigOri-MAD-36 NIR 05 38 48.10 -02 35 51.0           ~ 1 0
64 2MASS J05384828-0236409 Y*O 05 38 48.2919091608 -02 36 41.075987652 14.930 17.29   15.60 13.89 M4.5 14 0
65 [BNM2013] 90.02 90 LM* 05 38 48.6872974992 -02 36 16.297363080 13.474   15.45 14.24 13.37 M1.5 16 0
66 [W96] rJ053849-0238 LM* 05 38 49.1743174560 -02 38 22.302143052 17.35 16.22 14.87 13.93 12.91 M0.5e 21 0
67 2MASS J05384970-0234526 Y*O 05 38 49.7044756272 -02 34 52.679689680   19.12 17.96 16.84 14.79 ~ 18 0
68 2MASS J05385003-0237354 Y*O 05 38 50.0383707336 -02 37 35.548478076 19.47 18.95 18.00 16.69 14.93 ~ 18 0
69 [BNM2013] 90.02 362 LM* 05 38 50.7819191472 -02 36 26.805329712 18.816 18.76   16.98 15.12 M3.0 16 0
70 [BNM2013] 90.02 91 LM* 05 38 51.4560020472 -02 36 20.641613616 16.090 18.23 17.47 16.09 14.38 K5V 16 0
71 [BNM2013] 90.02 293 LM* 05 38 51.7468872456 -02 36 03.425317272 15.494 19.63 17.89 16.84 15.04 ~ 14 0
72 [W96] 4771-1049 Y*O 05 38 53.3786496600 -02 33 23.078055204 15.736 14.21 13.05 12.30 11.59 K3 14 0
73 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 24 0
74 2MASS J05390193-0235029 Y*O 05 39 01.9391478912 -02 35 02.905186848 19.818 20.72 19.68 18.46 17.11 M4 23 0
75 2MASS J10170754+1308398 BD* 10 17 07.5535371936 +13 08 39.784300548         17.418 L1.5+L3 31 0
76 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3567 1
77 Mayrit 72345 * ~ ~           ~ 2 0
78 Mayrit 111335 * ~ ~           ~ 1 0

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2023.11.28-11:56:55

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