2001A&A...379..208V

Query : 2001A&A...379..208V

2001A&A...379..208V - Astronomy and Astrophysics, volume 379, 208-214 (2001/11-3)

Low mass T Tauri and young brown dwarf candidates in the Chamaeleon II dark cloud found by DENIS.

VUONG M.H., CAMBRESY L. and EPCHTEIN N.

Abstract (from CDS):

We define a sample designed to select low-mass T Tauri stars and young brown dwarfs using DENIS data in the Chamaeleon II molecular cloud. We use a star count method to construct an extinction map of the Chamaeleon II cloud. We select our low-mass T Tauri star and young brown dwarf candidates by their strong infrared color excess in the I-J/J-Ks color-color dereddened diagram. We retain only objects with colors I-J≥2, and spatially distributed in groups around the cloud cores. This provides a sample of 70 stars of which 4 are previously known T Tauri stars. We have carefully checked the reliability of all these objects by visual inspection of the DENIS images. Thanks to the association of the optical I band to the infra-red J and Ks bands in DENIS, we can apply this selection method to all star formation regions observed in the southern hemisphere. We also identify six DENIS sources with X-ray sources detected by ROSAT. Assuming that they are reliable low-mass candidates and using the evolutionary models for low-mass stars, we estimate the age of these sources between 1Myr and <10Myr.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - ISM: dust, extinction - ISM: individual objects: Chamaeleon

Nomenclature: Table 1: [VCE2001] CNN (Nos C1-C70), [VCE2001] XN (Nos X1-X6).

Simbad objects: 81

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Number of rows : 81
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 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
2 IRAS 12340-7958 LP* 12 37 39.7408011816 -80 15 13.707391932   16.11 14.39 13.63 9.81 ~ 107 0
3 NAME Cha III MoC 12 37.8 -80 15           ~ 140 2
4 2MASS J12435331-7729445 * 12 43 53.32 -77 29 44.5           M5V 2 0
5 [VCE2001] C2 * 12 46 08.7243323520 -77 01 02.691684084           M4.5 2 0
6 [VCE2001] C3 * 12 47 11.7479808744 -76 39 29.984263056           M4.5V 2 0
7 [PWA92] 2 * 12 48 28.5267912864 -76 47 11.660811864           ~ 3 0
8 DENIS J125022.2-765638 LP? 12 50 22.2565439328 -76 56 37.922183448           ~ 2 0
9 [VCE2001] C6 PM* 12 50 39.7092349320 -76 10 39.205157844           ~ 2 0
10 [VCE2001] C7 * 12 51 10.5160128720 -77 30 54.035853732           M4.5 2 0
11 [LM99] 119 cor 12 51 28.3 -76 54 00           ~ 4 0
12 [VCE2001] C9 * 12 51 29.0534420928 -76 54 55.636361604           ~ 1 0
13 [VCE2001] C10 * 12 51 30.5330836776 -76 54 37.864973376           ~ 1 0
14 DENIS J125211.0-765253 LP? 12 52 11.0338785192 -76 52 53.483012148           ~ 2 0
15 [VCE2001] C12 * 12 52 15.5163633096 -76 52 25.844609352           ~ 1 0
16 IRAS Z12488-7658 LP* 12 52 30.6218360736 -77 15 13.123459980           M5.5 13 0
17 [VCE2001] C14 * 12 53 23.5130708616 -76 59 11.161064148           ~ 2 0
18 [VCE2001] C15 * 12 53 29.7574597608 -76 58 34.911644664           M5.5V 2 0
19 [LM99] 120 cor 12 53 29.8 -77 10 57           ~ 5 0
20 NAME Cha II MoC 12 54 -77.2           ~ 337 0
21 2MASS J12533890-7715532 Y*O 12 53 38.9146387776 -77 15 53.247287808           M1.5 12 1
22 DENIS J125400.2-762425 LP? 12 54 00.2610604632 -76 24 25.266006072           ~ 3 0
23 [VCE2001] C19 * 12 54 05.2461729456 -76 52 51.407348196           ~ 1 0
24 [VCE2001] C20 * 12 54 27.1311830520 -76 53 14.543243484           ~ 2 0
25 [VCE2001] C21 * 12 54 36.2316237648 -76 44 45.569779692           ~ 2 0
26 [VCE2001] C22 * 12 54 37.3181971872 -76 47 50.857916604           ~ 3 0
27 [VCE2001] C23 * 12 54 42.6341630112 -76 41 25.868155776           ~ 1 0
28 [VCE2001] C24 * 12 54 45.2724356976 -76 42 19.686764052           ~ 1 0
29 [VCE2001] C25 * 12 54 47.4350131440 -76 52 32.679689484           ~ 1 0
30 DENIS J125450.8-764632 DNe 12 54 50.8 -76 46 32           ~ 4 0
31 [VCE2001] C27 * 12 55 03.3187880472 -76 43 07.959751680           ~ 1 0
32 DENIS J125508.7-764510 LP? 12 55 08.7268014360 -76 45 10.600445700           ~ 3 0
33 DENIS J125514.4-762201 LP? 12 55 14.4587513688 -76 22 00.622263972           ~ 3 0
34 [VCE2001] C30 * 12 55 15.7744575720 -76 56 33.227953656           ~ 4 0
35 [VCE2001] C31 * 12 55 20.7186576696 -77 00 36.002512332           ~ 3 0
36 [VCE2001] C32 * 12 55 24.1570660152 -76 38 17.758837104           ~ 1 0
37 [VCE2001] C34 * 12 55 25.6772557968 -76 38 11.182147944           ~ 1 0
38 2MASS J12552576-7700465 Y*? 12 55 25.7478310392 -77 00 46.696978080           M1 5 0
39 [VCE2001] C35 PM* 12 57 25.9851023256 -77 23 35.194739748           ~ 1 0
40 [VCE2001] C36 * 12 57 29.3862752640 -76 12 06.664940208           ~ 1 0
41 IRAS 12539-7627 * 12 57 31.5486477672 -76 43 04.633148532           ~ 3 0
42 [VCE2001] C38 * 12 57 41.6161805256 -76 12 51.347761164           ~ 2 0
43 [VCE2001] C39 * 12 57 54.5860467384 -77 30 43.550532900           ~ 1 0
44 [VCE2001] C40 * 12 58 31.4074093416 -77 13 16.661651484           ~ 1 0
45 2MASS J12590984-7651037 Y*O 12 59 09.8766268200 -76 51 03.756572676           M5.5 14 0
46 2MASS J12591013-7712139 Y*O 12 59 10.1600323896 -77 12 13.864063428           M0 13 0
47 2MASS J12591062-7739190 LP* 12 59 10.6201691688 -77 39 18.950082264           ~ 2 0
48 [VCE2001] C43 * 12 59 30.3213816936 -77 21 04.973274900           ~ 1 0
49 DENIS J125942.8-771213 LP? 12 59 42.8692362576 -77 12 12.929500368           ~ 2 0
50 DENIS J125951.8-772719 LP? 12 59 51.8555022048 -77 27 18.939589452           ~ 3 0
51 [VCE2001] C46 * 12 59 52.1380751448 -77 20 15.146811924           ~ 1 0
52 [VCE2001] C47 * 13 00 24.1314026016 -77 10 22.647637632           ~ 1 0
53 2MASS J13005927-7714027 Y*O 13 00 59.2811230320 -77 14 02.848183656         16.26 ~ 24 0
54 [VCE2001] C49 PM* 13 01 21.3914443416 -77 13 25.445928468           ~ 1 0
55 2MASS J13022287-7734494 Y*O 13 02 22.8483923232 -77 34 49.479406140           M5 17 0
56 CHIIXR 15 * 13 02 42.2941147392 -77 11 11.370953760           ~ 2 0
57 UCAC3 26-31797 * 13 02 49.1919194064 -77 05 44.793266892           ~ 3 0
58 UCAC3 26-31820 * 13 03 09.0139400688 -77 00 32.944283676           ~ 3 0
59 2MASS J13030905-7755596 Y*O 13 03 09.0555653520 -77 55 59.569205808           M4.5 9 0
60 CHIIXR 22 * 13 03 23.9122247736 -77 16 37.278403464           ~ 2 0
61 CHIIXR 23 * 13 03 30.5624532576 -76 44 51.537574932           ~ 2 0
62 [VCE2001] C52 * 13 05 05.0929584216 -77 40 31.149298056           ~ 2 0
63 Hn 25 Y*O 13 05 08.5232959920 -77 33 42.630661188           M2.5 23 0
64 [VCE2001] C54 * 13 05 30.9855965472 -77 35 11.973819372           ~ 2 0
65 [VCE2001] C55 * 13 05 32.6984846832 -77 35 26.132952084           ~ 2 0
66 [VCE2001] C56 * 13 05 57.0236684184 -77 43 00.448793940           ~ 1 0
67 [VCE2001] C57 * 13 06 04.7165039256 -77 46 28.354411164           ~ 1 0
68 [VCE2001] C58 * 13 06 11.0563124112 -77 56 26.355595272           ~ 1 0
69 DENIS J130630.8-770024 LP? 13 06 30.8425192536 -77 00 24.099762492           ~ 2 0
70 Sz 57 Y*O 13 06 56.5765655088 -77 23 09.640416696   19.56 17.70     M5 20 0
71 Sz 58 Em* 13 06 57.4252298184 -77 23 41.593041672   17.89 16.01     K5 32 0
72 2MASS J13071806-7740529 Y*O 13 07 18.0439003536 -77 40 53.043429684         16.18 M4.5 19 0
73 DENIS J130721.4-774256 DNe 13 07 21.4 -77 42 56           ~ 3 0
74 DENIS J130741.2-780543 LP? 13 07 41.0977742328 -78 05 43.413333000           ~ 3 0
75 2MASS J13082279-7807047 * 13 08 22.7714321952 -78 07 04.668179592           ~ 1 0
76 2MASS J13082714-7743232 Y*O 13 08 27.1778458152 -77 43 23.297498148         16.55 M4.5 20 0
77 2MASS J13084672-7806446 * 13 08 46.7027506752 -78 06 44.612501832           ~ 2 0
78 2MASS J13090237-7808386 * 13 09 02.3534094576 -78 08 38.710090896           ~ 1 0
79 2MASS J13091466-7808065 * 13 09 14.6549249472 -78 08 06.607879620           ~ 2 0
80 2MASS J13092139-7807476 * 13 09 21.3207418992 -78 07 47.599593348           ~ 2 0
81 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 648 0

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