2011ApJ...730...65S

Query : 2011ApJ...730...65S

2011ApJ...730...65S - Astrophys. J., 730, 65 (2011/April-1)

The Spitzer survey of interstellar clouds in the Gould belt. IV. Lupus V and VI observed with IRAC and MIPS.

SPEZZI L., VERNAZZA P., MERIN B., ALLEN L.E., EVANS N.J., JORGENSEN J.K., BOURKE T.L., CIEZA L.A., DUNHAM M.M., HARVEY P.M., HUARD T.L., PETERSON D., TOTHILL N.F.H. (The Gould's Belt Team)

Abstract (from CDS):

We present Gould's Belt (GB) Spitzer IRAC and MIPS observations of the Lupus V and VI clouds and discuss them in combination with near-infrared (2MASS) data. Our observations complement those obtained for other Lupus clouds within the frame of the Spitzer "Core to Disk" (c2d) Legacy Survey. We found 43 young stellar object (YSO) candidates in Lupus V and 45 in Lupus VI, including two transition disks, using the standard c2d/GB selection method. None of these sources was classified as a pre-main-sequence star from previous optical, near-IR, and X-ray surveys. A large majority of these YSO candidates appear to be surrounded by thin disks (Class III; ∼79% in Lupus V and ∼87% in Lupus VI). These Class III abundances differ significantly from those observed for the other Lupus clouds and c2d/GB surveyed star-forming regions, where objects with optically thick disks (Class II) dominate the young population. We investigate various scenarios that can explain this discrepancy. In particular, we show that disk photoevaporation due to nearby OB stars is not responsible for the high fraction of Class III objects. The gas surface densities measured for Lupus V and VI lie below the star formation threshold (AV~ 8.6 mag), while this is not the case for other Lupus clouds. Thus, few Myr older age for the YSOs in Lupus V and VI with respect to other Lupus clouds is the most likely explanation of the high fraction of Class III objects in these clouds, while a higher characteristic stellar mass might be a contributing factor. Better constraints on the age and binary fraction of the Lupus clouds might solve the puzzle but require further observations.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - ISM: individual: Lupus V and VI - stars: formation - stars: low-mass - stars: pre-main sequence

Nomenclature: Table 2: SSTgbs JHHMMSSss+DDMMSSs N=43.

Simbad objects: 104

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Number of rows : 104
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 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
3 NAME Cha II MoC 12 54 -77.2           ~ 361 0
4 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
5 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 320 0
6 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
7 Lupus 4 MoC 16 03 12.4 -42 07 43           ~ 163 0
8 Lupus 3 SFR 16 09.6 -39 03           ~ 348 0
9 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
10 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
11 IRAS 16132-3657 LP* 16 16 31.9682616792 -37 04 56.454364092   17.85 15.31     ~ 6 0
12 IRAS 16133-3717 LP* 16 16 40.3523426904 -37 25 05.459128248           ~ 5 0
13 2MASS J16164198-3650456 Y*? 16 16 41.9850865392 -36 50 45.754112076   19.30   17.47   ~ 4 0
14 2MASS J16171811-3646306 Y*? 16 17 18.1153941192 -36 46 30.684745488   19.89   18.10 16.05 ~ 8 0
15 2MASS J16172475-3657332 Y*? 16 17 24.7471564272 -36 57 33.267439080   17.25 16.44   13.24 ~ 8 0
16 2MASS J16172485-3657405 Y*? 16 17 24.8588572104 -36 57 40.595550444   16.96 15.62 14.29 13.02 ~ 7 0
17 IRAS 16145-3638 LP? 16 17 53.8387084872 -36 45 20.764665864   17.61   9.85 8.59 ~ 4 0
18 2MASS J16175959-3719082 LP? 16 17 59.5845149880 -37 19 08.345635212       18.05 14.43 ~ 4 0
19 2MASS J16180426-3710276 Y*? 16 18 04.2483625800 -37 10 27.787347336   18.38 16.82 14.86 14.18 ~ 3 0
20 IRAS 16147-3659 LP* 16 18 07.0179884088 -37 06 54.489982248     17.74   11.39 ~ 5 0
21 2MASS J16180915-3725365 LP* 16 18 09.1487142288 -37 25 36.413556852     17.32 15.91 12.71 ~ 4 0
22 2MASS J16181728-3700598 LP? 16 18 17.2786890600 -37 00 59.787958680   18.93 17.18 15.68 12.10 ~ 4 0
23 2MASS J16182186-3730298 Y*O 16 18 21.8811636629 -37 30 29.674571259   17.86     14.54 ~ 4 0
24 2MASS J16182852-3739384 Y*? 16 18 28.527 -37 39 38.48   17.40     15.36 ~ 3 0
25 2MASS J16183413-3715489 LP* 16 18 34.1380506552 -37 15 48.975327504   19.44 17.74   13.62 ~ 4 0
26 PN SB 27 Y*O 16 19 14.0367020544 -37 47 27.911332680   16.424 15.039   13.130 ~ 16 1
27 2MASS J16192684-3651235 Y*? 16 19 26.8409227344 -36 51 23.637912588   17.95   16.93 15.41 ~ 7 0
28 2MASS J16194164-3746567 AB* 16 19 41.6388652272 -37 46 56.738163504   19.45   16.36 14.27 ~ 5 0
29 2MASS J16200207-4137265 AB* 16 20 02.0580478152 -41 37 26.312716740   17.31   15.37 12.06 ~ 5 0
30 IRAS 16167-4118 AB* 16 20 09.5019055752 -41 26 00.206530116   17.56   15.78 12.46 ~ 5 0
31 IRAS 16171-3723 AB* 16 20 31.5931890336 -37 30 40.693947624     17.32 16.96 12.03 ~ 6 0
32 2MASS J16205438-3742416 LP? 16 20 54.3736468176 -37 42 41.650247376   18.27   15.23 12.16 ~ 4 0
33 2MASS J16205449-3654431 AB* 16 20 54.4872053568 -36 54 43.185641580   18.47   16.03 13.11 ~ 5 0
34 Lupus 5 MoC 16 21 -37.5           ~ 63 0
35 2MASS J16210868-4116024 LP* 16 21 08.6873222832 -41 16 02.565895116   17.33   16.29 13.72 ~ 4 0
36 2MASS J16211126-4120172 LP* 16 21 11.2530429864 -41 20 17.268222588       18.71 15.40 ~ 4 0
37 2MASS J16212599-3731016 AB* 16 21 26.0094836736 -37 31 01.506379152       16.69   ~ 5 0
38 2MASS J16212991-3702211 AB* 16 21 29.9203126488 -37 02 21.288065892   18.38 16.07 14.84 12.61 ~ 5 0
39 2MASS J16213597-4121524 LP* 16 21 35.9660201136 -41 21 52.601552748   17.74 16.26 14.94 11.86 ~ 3 0
40 2MASS J16213962-4109135 LP? 16 21 39.6258990384 -41 09 13.619310336   18.84   16.17 13.31 ~ 4 0
41 2MASS J16214077-4122218 AB* 16 21 40.7716345824 -41 22 21.876380184   17.89   15.98 13.67 ~ 5 0
42 OGLE GD-LPV-12095 Mi* 16 21 49.7261771976 -41 07 01.840201428   18.03 19.506 15.35 13.05 ~ 8 0
43 IRAS 16185-3651 LP* 16 21 51.2567844552 -36 58 48.996839676   18.35 16.50   11.52 ~ 5 0
44 2MASS J16215624-3713166 AB* 16 21 56.2388027352 -37 13 16.670301060   19.19   17.18 13.64 ~ 5 0
45 2MASS J16215748-3656219 Y*? 16 21 57.4819526832 -36 56 22.034375088   18.38 16.37 14.95 13.24 ~ 3 0
46 2MASS J16215796-4131099 LP* 16 21 57.9721653096 -41 31 09.856750944   17.27 16.98 15.22 12.77 ~ 5 0
47 2MASS J16220163-3716369 AB* 16 22 01.6264861176 -37 16 36.993078084   18.42 17.28 16.20 13.61 ~ 6 0
48 2MASS J16221791-3658163 AB* 16 22 17.8960214664 -36 58 16.636828584   18.73   16.80 13.07 ~ 5 0
49 2MASS J16222723-4100410 LP? 16 22 27.2396025096 -41 00 41.194571040   18.00   16.41 13.48 ~ 4 0
50 2MASS J16222844-4113423 LP? 16 22 28.4482961736 -41 13 42.479612796       16.74 14.10 ~ 4 0
51 IRAS 16190-4116 Mi* 16 22 29.6580734616 -41 23 45.758171508     17.674   11.81 ~ 7 0
52 2MASS J16223343-4103178 AB* 16 22 33.4171370784 -41 03 18.084943116   18.25   16.34 13.19 ~ 4 0
53 2MASS J16223533-3706530 LP? 16 22 35.3294542896 -37 06 53.088023772   19.33   17.17 14.18 ~ 4 0
54 IRAS 16193-3714 AB* 16 22 42.6526444752 -37 21 23.194339956   18.82   16.08 13.21 ~ 6 0
55 2MASS J16225309-3724373 Mi* 16 22 53.0836538232 -37 24 37.391783400   18.33 16.44     ~ 7 1
56 2MASS J16230307-4021118 LP* 16 23 03.0708252144 -40 21 11.856954492   17.93     13.06 ~ 5 0
57 2MASS J16230367-3729412 AB* 16 23 03.6744263904 -37 29 41.159429484   17.88 17.41 16.02 13.98 ~ 5 0
58 2MASS J16231102-4117102 AB* 16 23 11.0220717384 -41 17 10.329178056   18.45   16.48 13.86 ~ 5 0
59 2MASS J16231475-4017149 AB* 16 23 14.7594525960 -40 17 15.122405868   18.47   16.96 13.71 ~ 5 0
60 IRAS 16198-4057 AB* 16 23 15.9883918416 -41 04 00.934772232   16.00 16.14 13.11 11.46 ~ 5 0
61 IRAS 16198-4012 LP* 16 23 18.4470925872 -40 19 44.039116452   15.48 13.40 12.35 10.56 ~ 4 0
62 2MASS J16232050-3741192 LP* 16 23 20.5045682784 -37 41 19.307743764       18.09 14.09 ~ 5 0
63 2MASS J16232638-3752081 AB* 16 23 26.3782331184 -37 52 08.250836988       17.31   ~ 5 0
64 2MASS J16232807-4015368 Y*O 16 23 28.0817899848 -40 15 36.898649640     17.22   14.81 ~ 4 0
65 2MASS J16233247-3752363 AB* 16 23 32.4569216904 -37 52 36.221633832   18.35 16.67 15.74 11.88 ~ 6 0
66 2MASS J16233735-4014490 LP* 16 23 37.3514781336 -40 14 49.032894336       18.69 15.15 ~ 4 0
67 2MASS J16233857-3735168 LP* 16 23 38.5770304944 -37 35 16.934278632   18.10 17.15   12.84 ~ 4 0
68 2MASS J16233866-3731387 AB* 16 23 38.6594481936 -37 31 38.831182356   18.58 17.74 15.80 13.10 ~ 5 0
69 OGLE GD-LPV-12269 Mi* 16 23 44.8672073664 -41 07 49.247020632         12.86 ~ 6 0
70 2MASS J16234899-3727291 Y*? 16 23 48.994 -37 27 29.17           ~ 3 0
71 2MASS J16234903-4026175 AB* 16 23 49.0363353024 -40 26 17.589786036   18.07   17.12 14.15 ~ 5 0
72 IRAS 16203-3749 LP? 16 23 50.5276460520 -37 56 55.888085472   18.31 16.11 14.41 10.94 ~ 4 0
73 2MASS J16235138-4010324 LP* 16 23 51.3835487784 -40 10 32.380173264   18.07   15.96 13.77 ~ 4 0
74 IRAS 16206-3746 AB* 16 23 59.0712801264 -37 53 52.773163332   18.38 15.99 14.28 10.74 ~ 5 0
75 2MASS J16242396-3952101 LP* 16 24 23.9608675224 -39 52 10.103431152   17.15     11.99 ~ 3 0
76 2MASS J16242615-4011026 LP? 16 24 26.1496780512 -40 11 02.615971668     17.20   13.44 ~ 4 0
77 2MASS J16242667-3757407 AB* 16 24 26.6647652544 -37 57 40.723686072   19.57   17.52 13.52 ~ 5 0
78 IRAS 16211-3747 LP* 16 24 32.3121797688 -37 54 39.815658792   17.49     11.76 ~ 4 0
79 2MASS J16244169-4004196 LP* 16 24 41.7008349720 -40 04 19.627217544   17.88 17.74 16.81 13.85 ~ 4 0
80 2MASS J16244645-3956150 Y*? 16 24 46.4558938512 -39 56 15.051971076           ~ 3 0
81 2MASS J16245177-3956326 Y*? 16 24 51.7728650088 -39 56 32.966762712           ~ 4 0
82 OGLE GD-LPV-12380 Mi* 16 24 55.6377907992 -39 49 14.733172128   17.27 17.720 15.93 13.08 ~ 7 0
83 IRAS 16215-4004 AB* 16 24 55.9135857264 -40 11 28.040710416       15.15 12.07 ~ 5 0
84 2MASS J16245681-4008237 LP? 16 24 56.8180408536 -40 08 23.806439736   17.39   15.31 12.40 ~ 4 0
85 Lupus 6 Cld 16 25 -40.3           ~ 51 1
86 IRAS 16217-3756 AB* 16 25 06.9035258112 -38 03 21.530160072   18.38 16.69 14.99 11.49 ~ 5 0
87 2MASS J16255247-4018485 AB* 16 25 52.4718085416 -40 18 48.484226520   18.14   17.39 13.75 ~ 5 0
88 2MASS J16255837-4009581 AB* 16 25 58.3779399624 -40 09 58.170143160   18.53   16.88 13.19 ~ 5 0
89 2MASS J16260854-4017443 LP* 16 26 08.5478385384 -40 17 44.273542344   16.86 16.68 15.28 12.12 ~ 4 0
90 OGLE GD-LPV-12497 Mi* 16 26 13.4100405792 -39 49 54.234681168   17.74 18.895 14.83 13.30 ~ 7 0
91 2MASS J16261366-4012187 LP? 16 26 13.6574445096 -40 12 18.662636700   17.95 17.11 15.81 12.57 ~ 4 0
92 2MASS J16262552-3944473 AB* 16 26 25.5273924792 -39 44 47.355899280   17.15   15.44 13.71 ~ 5 0
93 2MASS J16263114-3946154 Y*? 16 26 31.1521563360 -39 46 15.456205524         15.43 ~ 3 0
94 2MASS J16263155-4004558 LP* 16 26 31.5539304096 -40 04 55.862376852   18.00   15.84 12.63 ~ 4 0
95 2MASS J16263925-4015273 LP* 16 26 39.2620546968 -40 15 27.316264104         17.10 ~ 4 0
96 OGLE GD-LPV-12563 Mi* 16 26 53.6473922136 -39 54 59.532210144   18.08 18.308   12.25 ~ 7 0
97 OGLE GD-LPV-12575 Mi* 16 27 03.1036171272 -39 44 13.898704128     20.095   12.57 ~ 6 0
98 2MASS J16273176-3956012 LP* 16 27 31.7603866248 -39 56 01.262454540   18.35   16.83 14.44 ~ 4 0
99 2MASS J16275055-3948101 AB* 16 27 50.5488066936 -39 48 09.969815520   17.84   16.20 12.78 ~ 6 0
100 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
101 2MASS J16282648-3925428 Y*? 16 28 26.4779854032 -39 25 42.882035664   16.74   14.25   ~ 3 0
102 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
103 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
104 NAME Gould Belt PoG ~ ~           ~ 956 1

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