2009A&A...504..199B

Query : 2009A&A...504..199B

2009A&A...504..199B - Astronomy and Astrophysics, volume 504199-209 (2009/9-2)

A deep look into the core of young clusters. II. λ Orionis.

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

Abstract (from CDS):

Over the past years, the λ-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 and other properties of low mass cluster members. In the continuity of our previous studies of young associations cores, we search for ultracool members and new multiple systems within the central 5.3' (≃0.6pc) of the cluster. We obtained deep seeing limited J, Ks-band images of the 5.3' central part of the cluster with NTT/SofI and H-band images with CAHA/Omega2000. These images were complemented by multi-conjugate adaptive optics (MCAO) H and Ks images of the 1.5' central region of the λ-Orionis cluster obtained with the prototype MCAO facility MAD at the VLT. The direct vicinity of the massive λ-Ori O8III-star was probed using NACO/SDI at the VLT. Finally, we also retrieved Spitzer IRAC images of the same area and used archival Subaru Suprime-Cam and CFHT CFHT12K i-band images. We report the detection of 9 new member candidates selected from optical and near-IR color-color and color-magnitude diagrams and 7 previously known members. The high spatial resolution images resolve 3 new visual multiple systems. Two of them are most likely not members of the association. The third one is made of a brown dwarf candidate companion to the F8V star HD 36861C. The simultaneous differential images allow us to rule out the presence of visual companions more massive than M>0.07M☉ in the range 1-2.5", and M> 0.25M☉ in the range 0.5"-2.5".

Abstract Copyright: ∼

Journal keyword(s): stars: evolution - stars: formation - stars: general - stars: low mass, brown dwarfs - techniques: high angular resolution

Nomenclature: Table 3: LOri-SOC NN (Nos 1-16). Table 4: LOri-MAD NN (Nos 1-32).

Simbad objects: 55

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Number of rows : 55
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 FS 110 * 03 41 02.4 +06 56 13   13.90 13.20     G5 13 0
2 LOri-SOC 1 * 05 34 55.530 +09 56 10.09           ~ 2 0
3 LOri-SOC 2 * 05 34 56.670 +09 54 54.12           ~ 2 0
4 LOri-SOC 3 * 05 35 00.900 +09 54 40.39           ~ 2 0
5 [BNM2013] 53.02 1587 LM* 05 35 00.9427596288 +09 58 20.266010508 23.125     20.32 18.30 M7.0 11 0
6 LOri-SOC 5 * 05 35 03.030 +09 55 47.31           ~ 2 0
7 LOri-SOC 6 * 05 35 03.730 +09 54 13.93           ~ 2 0
8 LOri-MAD 1 * 05 35 04.264 +09 55 50.61           ~ 1 0
9 LOri-CFHT 162 * 05 35 04.44 +09 57 33.6       23.22 20.42 ~ 6 0
10 LOri-MAD 2 * 05 35 05.213 +09 56 10.77           ~ 1 0
11 LOri-MAD 3 * 05 35 05.309 +09 56 27.38           ~ 1 0
12 LOri-MAD 4 * 05 35 05.338 +09 56 15.25           ~ 1 0
13 LOri-MAD 5 * 05 35 05.432 +09 56 30.24           ~ 1 0
14 LOri-MAD 6 * 05 35 05.454 +09 55 32.61           ~ 1 0
15 LOri-MAD 7 * 05 35 05.531 +09 56 11.96           ~ 1 0
16 LOri-MAD 8 * 05 35 05.576 +09 55 26.06           ~ 1 0
17 LOri-MAD 9 * 05 35 05.614 +09 56 30.69           ~ 1 0
18 LOri-MAD 10 * 05 35 05.665 +09 56 13.59           ~ 1 0
19 LOri-MAD 11 * 05 35 05.691 +09 55 48.15           ~ 1 0
20 LOri-MAD 12 * 05 35 05.716 +09 56 35.36           ~ 1 0
21 LOri-MAD 13 * 05 35 05.889 +09 56 23.16           ~ 1 0
22 2MASS J05350590+0955533 * 05 35 05.8969731144 +09 55 53.433838092           ~ 1 0
23 LOri-MAD 15 * 05 35 05.949 +09 55 47.82           ~ 1 0
24 LOri-MAD 16 * 05 35 06.001 +09 55 39.33           ~ 1 0
25 LOri-MAD 17 * 05 35 06.085 +09 55 48.51           ~ 1 0
26 LOri-MAD 18 * 05 35 06.243 +09 56 34.68           ~ 1 0
27 [BNM2013] 54.04 1275 * 05 35 06.3092353704 +09 58 01.357915800 21.715     19.53 17.58 ~ 8 0
28 LOri-MAD 19 * 05 35 06.503 +09 56 32.60           ~ 1 0
29 LOri-MAD 20 * 05 35 06.536 +09 56 32.45           ~ 1 0
30 LOri-MAD 21 * 05 35 06.731 +09 56 19.68           ~ 1 0
31 LOri-MAD 22 * 05 35 06.757 +09 55 46.82           ~ 1 0
32 LOri-MAD 23 * 05 35 06.794 +09 55 47.60           ~ 1 0
33 2MASS J05350707+0954014 Or* 05 35 07.0772449872 +09 54 01.458884592 19.825     18.48 16.71 ~ 16 0
34 LOri-MAD 24 * 05 35 07.577 +09 55 37.36           ~ 1 0
35 LOri-MAD 25 * 05 35 07.672 +09 55 48.02           ~ 1 0
36 LOri-SOC 10 * 05 35 07.790 +09 55 21.84           ~ 2 0
37 LOri-MAD 26 * 05 35 07.811 +09 55 30.79           ~ 1 0
38 LOri-MAD 27 * 05 35 07.956 +09 56 08.77           ~ 1 0
39 LOri-MAD 28 * 05 35 07.979 +09 55 52.85           ~ 1 0
40 LOri-MAD 30 * 05 35 08.138 +09 55 34.27           ~ 2 0
41 2MASS J05350816+0955344 Y*O 05 35 08.1610516224 +09 55 34.436682948   11.1 10.72     F8V 30 0
42 LOri-MAD 31 * 05 35 08.245 +09 55 41.24           ~ 1 0
43 * lam Ori A Em* 05 35 08.2760807112 +09 56 02.991326316 2.17 3.48 3.47     O8III((f)) 527 0
44 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 327 0
45 LOri-MAD 32 * 05 35 08.443 +09 55 44.62           ~ 1 0
46 * lam Ori B Y*? 05 35 08.4812956320 +09 56 06.099512244       5.29   B0.5V 147 0
47 LOri-SOC 11 BD* 05 35 09.0908088528 +09 54 35.974658160           L0-2 4 0
48 LOri-SOC 12 * 05 35 10.650 +09 57 23.31           ~ 2 0
49 LOri-SOC 13 BD* 05 35 10.7584078728 +09 56 06.339314256           L0-2 3 0
50 [BNM2013] 53.02 279 LM* 05 35 10.9584309624 +09 57 43.879219740 19.481     17.39 15.81 ~ 18 0
51 [BNM2013] 53.02 505 LM* 05 35 11.1298096200 +09 57 19.596222756 21.187     18.02 16.37 M5.0 17 0
52 LOri-CFHT 167 * 05 35 14.149 +09 54 07.91 21.997     23.86 20.90 ~ 9 0
53 Cl Collinder 69 OpC 05 35 32.1 +09 44 02     2.8     ~ 369 0
54 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
55 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1

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