2007A&A...470..281S

Query : 2007A&A...470..281S

2007A&A...470..281S - Astronomy and Astrophysics, volume 470281-294 (2007/7-4)

A WFI survey in the Chamaeleon II dark cloud.

SPEZZI L., ALCALA J.M., FRASCA A., COVINO E. and GANDOLFI D.

Abstract (from CDS):

We present the results of an optical multi-band survey for low-mass pre-main sequence (PMS) stars and young brown dwarfs (BDs) in the Chamaeleon II (Cha II) dark cloud. This survey constitutes the complementary optical data to the c2d Spitzer Legacy survey in Cha II. Using the wide-field imager (WFI) at the ESO 2.2m telescope, we surveyed a sky area of about 1.75 square degrees in Cha II. The region was observed in the Rc, Ic, and z broad-bands, in Hα and in two medium-band filters centred at 856 and 914nm. We selected PMS star and young BD candidates using colour-magnitude diagrams (CMDs) and theoretical isochrones reproduced ad-hoc for the WFI at the ESO2.2m telescope system. We reinforced the selection criteria by using the previously known PMS stars in Cha II to define the PMS locus on the CMDs and by investigating the infrared (IR) colours of the candidates. By exploiting the WFI intermediate-band photometry we also estimated the effective temperature and the level of Hα emission of the candidates. Our survey, which is one of the largest and deepest optical surveys conducted so far in Cha II, recovered the majority of the PMS stars and 10 member candidates of the cloud from previous IR surveys. In addition, the survey revealed 10 new potential members. From our photometric characterisation, we estimate that some 50% of the 20 candidates will result in true Cha II members. Based on our temperature estimates, we conclude that several of these objects are expected to be sub-stellar and give a first estimate of the fraction of sub-stellar objects.

Abstract Copyright: ∼

Journal keyword(s): stars: low-mass, brown dwarfs - stars: formation - stars: pre-main sequence - ISM: clouds - ISM: individual objects: Chamaeleon II

VizieR on-line data: <Available at CDS (J/A+A/470/281): table7.dat refs.dat>

Nomenclature: Tables 6,7: [SAF2007] WFI JHHMMSSss+DDMMSSs N=11.

Simbad objects: 94

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Number of rows : 94
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 Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
4 LDN 1616 DNe 05 07 00 -03 21.1           ~ 36 0
5 HD 289002 * 06 45 13.3725491952 +02 08 14.685250596 10.06 10.62 10.44     B1 277 0
6 SA 98- reg 06 52 04.1 -00 23 58           ~ 179 0
7 HD 50188 * 06 52 04.9534074192 -00 18 18.258471324 9.436 9.535 9.538 9.528 9.521 B8/9IV 35 0
8 HD 50209 Be* 06 52 10.3593170304 -00 17 43.927976508 8.05 8.37 8.36     B9Ve 60 1
9 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
10 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
11 LAWD 37 WD* 11 45 42.9169346379 -64 50 29.461957832 11.08 11.725 11.513 11.34 11.163 DQ 287 0
12 V* AX Cha Mi* 12 45 06.2856573984 -77 20 13.642917324           M2.5 14 0
13 IRAS 12448-7650 LP? 12 48 25.7049616224 -77 06 36.747495432   17.25 15.14 14.33   M0.5 19 0
14 IRAS Z12488-7658 LP* 12 52 30.6218360736 -77 15 13.123459980           M5.5 13 0
15 V* DK Cha TT* 12 53 17.2111480272 -77 07 10.736046012           F0e 149 0
16 2MASS J12533665-7706394 Y*? 12 53 36.6468178392 -77 06 39.510208008       22.22 19.35 M6 4 0
17 NAME Cha II MoC 12 54 -77.2           ~ 361 0
18 2MASS J12533890-7715532 Y*O 12 53 38.9146387776 -77 15 53.247287808           M1.5 12 1
19 [LEM2005b] ChaII 304 * 12 55 15.9 -76 46 22           M9.5 2 1
20 [LEM2005b] ChaII 305 * 12 55 16.3 -76 46 21           M9.5 2 1
21 2MASS J12552576-7700465 Y*? 12 55 25.7478310392 -77 00 46.696978080           M1 5 0
22 HH 54 HH 12 55 49.5 -76 56 08           ~ 119 0
23 2MASS J12560549-7654106 Y*O 12 56 05.4881804952 -76 54 10.868637456           ~ 5 0
24 NAME Sz 46NW * 12 56 32.850 -76 45 44.78   20.21 19.29 18.45 17.69 ~ 1 0
25 NAME Sz 46S * 12 56 33.640 -76 45 49.54   18.59 17.53 16.81 16.05 ~ 1 0
26 UCAC3 27-35004 Or* 12 56 33.6498681600 -76 45 45.520705728   17.66 16.19 14.61 13.16 M1 34 1
27 Sz 47 Y*O 12 56 58.6633997016 -76 47 06.861163092   14.5       ~ 20 0
28 2MASS J12570041-7648347 * 12 57 00.42 -76 48 34.7           ~ 12 0
29 IRAS 12535-7623 Y*O 12 57 11.6949853032 -76 40 11.291754000   17.20 15.00     M0e 45 0
30 2MASS J12580676-7709094 Y*O 12 58 06.6784743816 -77 09 09.650462868         19.61 M6 22 0
31 2MASS J12583674-7704065 Y*? 12 58 36.6569965752 -77 04 06.698050068       22.45 19.32 M9 4 0
32 IRAS 12551-7657 FIR 12 58 52.6 -77 13 32           ~ 3 0
33 2MASS J12585614-7630104 Y*O 12 58 56.1408783960 -76 30 10.544207580       16.39 14.38 M5 10 0
34 2MASS J12590656-7707401 Y*O 12 59 06.56 -77 07 40.1           K4.5 51 0
35 2MASS J12590984-7651037 Y*O 12 59 09.8766268200 -76 51 03.756572676           M5.5 16 0
36 2MASS J12591013-7712139 Y*O 12 59 10.1600323896 -77 12 13.864063428           M0 15 0
37 [SAF2007] WFI J12591881-7704419 * 12 59 18.8102620248 -77 04 42.001205304       15.69 14.09 ~ 2 0
38 [SAF2007] WFI J12592348-7726589 * 12 59 23.5263219600 -77 26 58.985119680       14.41 12.99 ~ 2 0
39 IRAS 12556-7731 LP* 12 59 26.3852196576 -77 47 08.619604404   15.039 13.136 12.748   M5 25 0
40 2MASS J13005303-7709478 Y*? 13 00 53.03 -77 09 47.9       22.63 19.64 M9 4 0
41 Sz 49 Y*O 13 00 53.2473650928 -76 54 15.206649912   15.6       M0.5 47 0
42 RX J1300.9-7708 Y*O 13 00 53.46120 -77 09 08.6580           M1 23 0
43 RX J1300.9-7708A Or* 13 00 53.5904796360 -77 09 08.405133264   19.17 18.05 16.08 14.32 M0.5 12 0
44 2MASS J13005534-7708296 Y*O 13 00 55.3405780272 -77 08 29.630496552       14.93 13.29 M2.5 12 0
45 Sz 50 Y*O 13 00 55.3820751133 -77 10 22.247668674   17.64 16.01     M3 47 0
46 ASAS J130056-7653.9 TT* 13 00 56.2347315648 -76 54 02.375615448   13.79 12.35 11.93 10.446 K5 19 0
47 2MASS J13005927-7714027 Y*O 13 00 59.2811230320 -77 14 02.848183656         16.26 ~ 27 0
48 [SAF2007] WFI J13014752-7631023 * 13 01 47.5825654248 -76 31 02.199126180       16.83 15.23 ~ 2 0
49 ISO-ChaII 73 IR 13 01 47.8 -77 16 01           ~ 4 0
50 Sz 51 Or* 13 01 58.8991295760 -77 51 21.848767020   15.38       K8.5 46 0
51 V* CM Cha TT* 13 02 13.5244979592 -76 37 57.818696016   14.70 13.40     K7IVe 49 0
52 2MASS J13022287-7734494 Y*O 13 02 22.8483923232 -77 34 49.479406140           M5 21 0
53 IRAS 12589-7646 Y*O 13 02 47.7032642640 -77 02 39.973174116       13.75 9.98 M4 17 0
54 2MASS J13030444-7707027 TT* 13 03 04.4591495760 -77 07 02.759053872     13.23     M0 16 1
55 2MASS J13030905-7755596 Y*O 13 03 09.0555653520 -77 55 59.569205808           M4.5 13 0
56 [LEM2005b] ChaII 376 * 13 03 13.3 -76 50 51           ~ 3 0
57 2MASS J13031616-7629381 Y*? 13 03 16.1644556256 -76 29 38.139787680       16.42 14.41 M7 9 0
58 HD 113074B * 13 03 30.6951784896 -77 02 03.726053484       12.56   ~ 1 0
59 HD 113074 * 13 03 30.9382746912 -77 01 53.775816240   9.55 9.40 9.81   B9V 19 0
60 ISO-ChaII 110 IR 13 04 19.9 -76 53 59           ~ 4 0
61 Hn 22 Y*O 13 04 22.8528353784 -76 50 05.477354844           M2e 20 0
62 Hn 23 Y*O 13 04 24.1091476992 -76 50 01.203848088           K7e 27 0
63 Sz 52 Y*O 13 04 24.8675032320 -77 52 30.280923336   17.7     14.66 M2.5 30 0
64 Hn 24 Y*O 13 04 55.7191411392 -77 39 49.222352340           M0 34 0
65 Hn 25 Y*O 13 05 08.5232959920 -77 33 42.630661188           M2.5 26 0
66 Sz 53 Or* 13 05 12.6752612232 -77 30 52.566390396   17.85 16.59     M1 35 0
67 Hen 3-854 Or* 13 05 20.6574078672 -77 39 01.506188880   13.88 12.40     K5 49 0
68 Sz 55 Or* 13 06 30.5147352624 -77 34 00.166145700   18.90 17.49     M2 23 0
69 Sz 56 Or* 13 06 38.7881087232 -77 30 35.274308688   18.53 17.08     M4 26 0
70 Sandqvist 160 DNe 13 06.9 -77 01           ~ 42 0
71 Sz 57 Or* 13 06 56.5765655088 -77 23 09.640416696   19.56 17.70     M5 23 0
72 Sz 58 Em* 13 06 57.4252298184 -77 23 41.593041672   17.89 16.01     K5 37 0
73 V* BK Cha Or* 13 07 09.247848 -77 30 30.56004   16.11 14.58 14.41   K7 35 0
74 2MASS J13071806-7740529 Y*O 13 07 18.0439003536 -77 40 53.043429684         16.18 M4.5 23 0
75 2MASS J13071961-7655475 * 13 07 19.62 -76 55 47.5       18.33 16.49 ~ 2 0
76 NAME Sz 60W Or* 13 07 22.3510937688 -77 37 22.664073396   17.35 15.77 15.96 13.45 M1e 14 0
77 NAME Sz 60E Or* 13 07 23.3754539424 -77 37 23.233614528   18.16 16.80 16.13 13.60 M4e 12 0
78 Hn 26 Y*O 13 07 48.4988968944 -77 41 21.572667204           M2 26 0
79 V* BM Cha Or* 13 08 06.2695235808 -77 55 05.329818156   16.77 14.60     K5 61 0
80 2MASS J13082714-7743232 Y*O 13 08 27.1778458152 -77 43 23.297498148         16.55 M4.5 23 0
81 CHIIXR 37 Y*O 13 09 09.6 -77 09 52           ~ 6 1
82 2MASS J13090987-7709437 Y*O 13 09 09.9088695936 -77 09 43.801176816       15.37 14.04 M0.5 15 0
83 NAME IRAS F13052-7653S ? 13 09 10.670 -77 09 46.84       13.49 12.57 ~ 1 0
84 2MASS J13091071-7709443 Y*O 13 09 10.71600 -77 09 44.3628       13.47 12.42 M1.5 8 0
85 Sz 62 Y*O 13 09 50.36808 -77 57 24.0228   16.99 15.55 14.838   M2.5 33 0
86 Sz 63 Y*O 13 10 04.1819222640 -77 10 44.849941680   15.2       M3 23 0
87 2MASS J13102531-7729085 Y*O 13 10 25.2630754752 -77 29 08.749518036           ~ 3 0
88 2MASS J13110329-7653330 Y*O 13 11 03.2891384712 -76 53 33.056960244           ~ 2 0
89 2MASS J13125238-7739182 Y*O 13 12 52.38 -77 39 18.3           M4.5 7 0
90 Sz 64 Y*O 13 14 03.7124279328 -77 53 07.576738116   16.3       M5 21 0
91 SA 107- reg 15 39.2 -00 20           ~ 91 0
92 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 526 0
93 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
94 [SAF2007] WFI J13031616-7629381 * ~ ~           ~ 1 0

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