2008ApJ...680.1295S

Query : 2008ApJ...680.1295S

2008ApJ...680.1295S - Astrophys. J., 680, 1295-1318 (2008/June-3)

The young population of the Chamaeleon II dark cloud.

SPEZZI L., ALCALA J.M., COVINO E., FRASCA A., GANDOLFI D., OLIVEIRA I., CHAPMAN N., EVANS II N.J., HUARD T.L., JORGENSEN J.K., MERIN B. and STAPELFELDT K.R.

Abstract (from CDS):

We discuss the results of the optical spectroscopic follow-up of pre-main-sequence (PMS) objects and candidates selected in the Chamaeleon II dark cloud based on data from the Spitzer Legacy survey ``From Molecular Cores to Planet Forming Disks'' (c2d) and from previous surveys. Our sample includes both objects with infrared excess selected according to c2d criteria and referred to as young stellar objects and other cloud members and candidates selected from complementary optical and near-infrared data. We characterize the sample of objects by deriving their physical parameters. The vast majority of objects have masses M≤1 M☉ and ages <6 Myr. Several of the PMS objects and candidates lie very close to or below the hydrogen-burning limit. A first estimate of the slope of the initial mass function in Cha II is consistent with that of other T associations. The star formation efficiency in the cloud (1%-4%) is consistent with our own estimates for Taurus and Lupus, but significantly lower than for Cha I. This might mean that different star formation activities in the Chamaeleon clouds may reflect a different history of star formation. We also find that the Cha II cloud is turning some 8 M☉into stars every megayear, which is less than the star formation rate in the other c2d clouds. However, the star formation rate is not steady and evidence is found that the star formation in Cha II might have occurred very rapidly. The Hα emission of the Cha II PMS objects, as well as possible correlations between their stellar and disk properties, is also investigated.

Abstract Copyright: ∼

Journal keyword(s): Stars: Circumstellar Matter - Infrared: Stars - Stars: Planetary Systems: Protoplanetary Disks - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/ApJ/680/1295): table1.dat table4.dat>

Simbad objects: 91

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Number of rows : 91
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 Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
3 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
4 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 887 0
5 V* AX Cha Mi* 12 45 06.2856573984 -77 20 13.642917324           M2.5 14 0
6 IRAS 12448-7650 LP? 12 48 25.7049616224 -77 06 36.747495432   17.25 15.14 14.33   M0.5 19 0
7 IRAS Z12488-7658 LP* 12 52 30.6218360736 -77 15 13.123459980           M5.5 13 0
8 V* DK Cha TT* 12 53 17.2111480272 -77 07 10.736046012           F0e 149 0
9 2MASS J12533665-7706394 Y*? 12 53 36.6468178392 -77 06 39.510208008       22.22 19.35 M6 4 0
10 NAME Cha II MoC 12 54 -77.2           ~ 361 0
11 2MASS J12533890-7715532 Y*O 12 53 38.9146387776 -77 15 53.247287808           M1.5 12 1
12 2MASS J12534285-7715114 Y*O 12 53 42.856 -77 15 11.48           M6.5 23 0
13 [VCE2001] C30 * 12 55 15.7744575720 -76 56 33.227953656           ~ 4 0
14 2MASS J12552576-7700465 Y*? 12 55 25.7478310392 -77 00 46.696978080           M1 5 0
15 HH 54 HH 12 55 49.5 -76 56 08           ~ 119 0
16 SSTc2d J125552.5-765616 Y*O 12 55 52.70 -76 56 16.0           ~ 15 0
17 2MASS J12560549-7654106 Y*O 12 56 05.4881804952 -76 54 10.868637456           ~ 5 0
18 UCAC3 27-35004 Or* 12 56 33.6498681600 -76 45 45.520705728   17.66 16.19 14.61 13.16 M1 34 1
19 Sz 47 Y*O 12 56 58.6633997016 -76 47 06.861163092   14.5       ~ 20 0
20 IRAS 12535-7623 Y*O 12 57 11.6949853032 -76 40 11.291754000   17.20 15.00     M0e 45 0
21 IRAS 12539-7627 * 12 57 31.5486477672 -76 43 04.633148532           ~ 4 0
22 NAME Cha J1257-7701 Y*O 12 57 58.70 -77 01 19.5         22.61 M9 9 0
23 2MASS J12580676-7709094 Y*O 12 58 06.6784743816 -77 09 09.650462868         19.61 M6 22 0
24 2MASS J12583674-7704065 Y*? 12 58 36.6569965752 -77 04 06.698050068       22.45 19.32 M9 4 0
25 2MASS J12585614-7630104 Y*O 12 58 56.1408783960 -76 30 10.544207580       16.39 14.38 M5 10 0
26 2MASS J12590656-7707401 Y*O 12 59 06.56 -77 07 40.1           K4.5 51 0
27 2MASS J12590984-7651037 Y*O 12 59 09.8766268200 -76 51 03.756572676           M5.5 16 0
28 2MASS J12591013-7712139 Y*O 12 59 10.1600323896 -77 12 13.864063428           M0 15 0
29 IRAS F12555-7638 LP? 12 59 15.8227225272 -76 54 45.696513600           ~ 7 0
30 [SAF2007] WFI J12591881-7704419 * 12 59 18.8102620248 -77 04 42.001205304       15.69 14.09 ~ 2 0
31 [SAF2007] WFI J12592348-7726589 * 12 59 23.5263219600 -77 26 58.985119680       14.41 12.99 ~ 2 0
32 IRAS 12556-7731 LP* 12 59 26.3852196576 -77 47 08.619604404   15.039 13.136 12.748   M5 25 0
33 DENIS J125951.8-772719 LP? 12 59 51.8555022048 -77 27 18.939589452           ~ 3 0
34 2MASS J13005303-7709478 Y*? 13 00 53.03 -77 09 47.9       22.63 19.64 M9 4 0
35 RX J1300.9-7708B Or* 13 00 53.2360864848 -77 09 09.303222348           ~ 11 0
36 Sz 49 Y*O 13 00 53.2473650928 -76 54 15.206649912   15.6       M0.5 47 0
37 RX J1300.9-7708 Y*O 13 00 53.46120 -77 09 08.6580           M1 23 0
38 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
39 2MASS J13005534-7708296 Y*O 13 00 55.3405780272 -77 08 29.630496552       14.93 13.29 M2.5 12 0
40 Sz 50 Y*O 13 00 55.3820751133 -77 10 22.247668674   17.64 16.01     M3 47 0
41 ASAS J130056-7653.9 TT* 13 00 56.2347315648 -76 54 02.375615448   13.79 12.35 11.93 10.446 K5 19 0
42 2MASS J13005927-7714027 Y*O 13 00 59.2811230320 -77 14 02.848183656         16.26 ~ 27 0
43 [SAF2007] WFI J13014752-7631023 * 13 01 47.5825654248 -76 31 02.199126180       16.83 15.23 ~ 2 0
44 ISO-ChaII 73 IR 13 01 47.8 -77 16 01           ~ 4 0
45 Sz 51 Or* 13 01 58.8991295760 -77 51 21.848767020   15.38       K8.5 46 0
46 RX J1302.0-7650 X 13 01 59.5 -76 50 19           ~ 2 0
47 IRAS 12583-7634 FIR 13 02 07.2 -76 51 07           ~ 3 0
48 V* CM Cha TT* 13 02 13.5244979592 -76 37 57.818696016   14.70 13.40     K7IVe 49 0
49 2MASS J13022287-7734494 Y*O 13 02 22.8483923232 -77 34 49.479406140           M5 21 0
50 IRAS 12589-7646 Y*O 13 02 47.7032642640 -77 02 39.973174116       13.75 9.98 M4 17 0
51 RX J1303.0-7715 X 13 02 57.5 -77 15 14           ~ 3 0
52 2MASS J13030444-7707027 TT* 13 03 04.4591495760 -77 07 02.759053872     13.23     M0 16 1
53 2MASS J13030905-7755596 Y*O 13 03 09.0555653520 -77 55 59.569205808           M4.5 13 0
54 [LEM2005b] ChaII 376 * 13 03 13.3 -76 50 51           ~ 3 0
55 2MASS J13031616-7629381 Y*? 13 03 16.1644556256 -76 29 38.139787680       16.42 14.41 M7 9 0
56 ISO-ChaII 110 IR 13 04 19.9 -76 53 59           ~ 4 0
57 Hn 22 Y*O 13 04 22.8528353784 -76 50 05.477354844           M2e 20 0
58 IRAS 13005-7633 mul 13 04 23.96 -76 50 02.0           ~ 13 0
59 Hn 23 Y*O 13 04 24.1091476992 -76 50 01.203848088           K7e 27 0
60 Sz 52 Y*O 13 04 24.8675032320 -77 52 30.280923336   17.7     14.66 M2.5 30 0
61 Hn 24 Y*O 13 04 55.7191411392 -77 39 49.222352340           M0 34 0
62 Hn 25 Y*O 13 05 08.5232959920 -77 33 42.630661188           M2.5 26 0
63 Sz 53 Or* 13 05 12.6752612232 -77 30 52.566390396   17.85 16.59     M1 35 0
64 Hen 3-854 Or* 13 05 20.6574078672 -77 39 01.506188880   13.88 12.40     K5 49 0
65 2MASS J13052169-7738102 Y*O 13 05 21.6550009440 -77 38 10.259255184           ~ 16 0
66 SSTc2d J130529.0-774140 Y*O 13 05 29.04 -77 41 40.1           ~ 11 0
67 [VCE2001] C55 * 13 05 32.6984846832 -77 35 26.132952084           ~ 2 0
68 NAME Cha J1305-7739 BD* 13 05 40.80 -77 39 58.2         22.16 L1 7 0
69 Sz 55 Or* 13 06 30.5147352624 -77 34 00.166145700   18.90 17.49     M2 23 0
70 Sz 56 Or* 13 06 38.7881087232 -77 30 35.274308688   18.53 17.08     M4 26 0
71 Sandqvist 160 DNe 13 06.9 -77 01           ~ 42 0
72 Sz 57 Or* 13 06 56.5765655088 -77 23 09.640416696   19.56 17.70     M5 23 0
73 Sz 58 Em* 13 06 57.4252298184 -77 23 41.593041672   17.89 16.01     K5 37 0
74 V* BK Cha Or* 13 07 09.247848 -77 30 30.56004   16.11 14.58 14.41   K7 35 0
75 2MASS J13071806-7740529 Y*O 13 07 18.0439003536 -77 40 53.043429684         16.18 M4.5 23 0
76 2MASS J13071961-7655475 * 13 07 19.62 -76 55 47.5       18.33 16.49 ~ 2 0
77 NAME Sz 60W Or* 13 07 22.3510937688 -77 37 22.664073396   17.35 15.77 15.96 13.45 M1e 14 0
78 NAME Sz 60E Or* 13 07 23.3754539424 -77 37 23.233614528   18.16 16.80 16.13 13.60 M4e 12 0
79 PSCz Q13036-7644 Y*O 13 07 36.89 -77 00 09.7           ~ 41 1
80 Hn 26 Y*O 13 07 48.4988968944 -77 41 21.572667204           M2 26 0
81 V* BM Cha Or* 13 08 06.2695235808 -77 55 05.329818156   16.77 14.60     K5 61 0
82 2MASS J13082714-7743232 Y*O 13 08 27.1778458152 -77 43 23.297498148         16.55 M4.5 23 0
83 2MASS J13090987-7709437 Y*O 13 09 09.9088695936 -77 09 43.801176816       15.37 14.04 M0.5 15 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 J13125238-7739182 Y*O 13 12 52.38 -77 39 18.3           M4.5 7 0
89 Sz 64 Y*O 13 14 03.7124279328 -77 53 07.576738116   16.3       M5 21 0
90 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
91 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1

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