2010ApJS..191..389C

Query : 2010ApJS..191..389C

2010ApJS..191..389C - Astrophys. J., Suppl. Ser., 191, 389-422 (2010/December-0)

Precision photometric monitoring of very low mass σ Orionis cluster members: variability and rotation at a few Myr.

CODY A.M. and HILLENBRAND L.A.

Abstract (from CDS):

We present high-precision photometry on 107 variable low-mass stars and brown dwarfs in the ∼3 Myr σ Orionis open cluster. We have carried out I-band photometric monitoring within two fields, encompassing 153 confirmed or candidate members of the low-mass cluster population, from 0.02 to 0.5 M☉. We are sensitive to brightness changes on timescales from 10 minutes to two weeks with amplitudes as low as 0.004 mag, and find variability on these timescales in nearly 70% of cluster members. We identify both periodic and aperiodic modes of variability, as well as semi-periodic rapid fading events that are not accounted for by the standard explanations of rotational modulation of surface features or accretion. We have incorporated both optical and infrared color data to uncover trends in variability with mass and circumstellar disks. While the data confirm that the lowest-mass objects (M < 0.2 M☉) rotate more rapidly than the 0.2-0.5 M☉members, they do not support a direct connection between rotation rate and the presence of a disk. Finally, we speculate on the origin of irregular variability in cluster members with no evidence for disks or accretion.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - open clusters and associations: individual: σ Orionis - protoplanetary disks - stars: low-mass - stars: rotation - stars: variables: T Tauri, Herbig Ae/Be - techniques: photometric

VizieR on-line data: <Available at CDS (J/ApJS/191/389): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Table 3: [CH2010] CTIO JHHMMSSss+DDMMSSs N=8.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 172

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Number of rows : 172
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 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20 12.03   K5Ve 801 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
4 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 281 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
6 2MASS J05372806-0236065 Y*O 05 37 28.0704671328 -02 36 06.544168848     17.57 16.46   M2.0 7 0
7 [BZR99] S Ori 40 Or* 05 37 36.4816663032 -02 41 56.713683516   23.22   20.12 17.79 M3.5 20 0
8 2MASS J05373784-0245442 TT* 05 37 37.8476299992 -02 45 44.268368292   17.74 16.25 15.23 14.01 M2.0 19 0
9 UCAC2 30799946 * 05 37 37.9096328808 -02 36 08.535068676           ~ 1 0
10 [CH2010] CTIO J05373835-0243516 EB* 05 37 38.3484954958 -02 43 51.610684176           ~ 2 0
11 [CH2010] CTIO J05373954-0238446 V* 05 37 39.54 -02 38 44.6           ~ 1 0
12 2MASS J05374413-0235198 * 05 37 44.1458749248 -02 35 20.064735096           ~ 1 0
13 [CH2010] CTIO J05374598-0238011 EB* 05 37 45.9807758534 -02 38 01.119001850           ~ 2 0
14 UCAC2 30799972 TT* 05 37 51.6115361832 -02 35 25.689580476 18.636   15.64 14.56 13.34 M2.0 33 0
15 Mayrit 790270 Or* 05 37 52.0709450400 -02 36 04.648658184   22.41 20.91 19.20 17.34 M4.5 15 0
16 ESO-HA 1638 Em* 05 37 53.9802157992 -02 49 54.536632932   20.07 18.47 17.19 15.71 M2.5: 16 0
17 2MASS J05375404-0244407 TT* 05 37 54.0484860384 -02 44 40.720129764   18.58 17.07 15.90 14.48 M3.0 23 0
18 2MASS J05375486-0241092 Y*O 05 37 54.8664722592 -02 41 09.237564456   19.68 18.34 17.14 15.43 M5.0 25 0
19 [BZR99] S Ori 12 Or* 05 37 57.4587695400 -02 38 44.468902788   20.61 19.81 18.15 16.42 M4.5/6V 33 0
20 2MASS J05375840-0241262 Or* 05 37 58.4022378912 -02 41 26.234314764   21.06 18.63 17.26 15.31 M5.5 25 0
21 2MASS J05375970-0251033 Y*O 05 37 59.7057951456 -02 51 03.423873492     13.45     G7.0 9 0
22 2MASS J05380055-0245097 TT* 05 38 00.5578708440 -02 45 09.799560396   19.09 17.61 16.31 14.54 M5.0 26 0
23 Haro 5-7 TT* 05 38 01.0746724561 -02 45 38.026086860   18.61 17.38 15.97 14.24 M4.5 30 0
24 2MASS J05380552-0235571 Y*O 05 38 05.5214643432 -02 35 57.126120288   26.46 21.41 19.60 17.70 M4.5 19 0
25 Kiso A-0976 316 TT* 05 38 08.2658566896 -02 35 56.276354400 18.050   16.19 15.08 13.76 M2.5 40 0
26 ESO-HA 1656 TT* 05 38 09.9441940848 -02 51 37.760438520   17.81 16.40 15.25 13.93 M3.0 23 0
27 2MASS J05381175-0245012 Y*O 05 38 11.7528827064 -02 45 01.243679184   15.69 14.01   11.97 M1.5 15 0
28 [HHM2007] 395 * 05 38 12.6447076872 -02 36 37.768803876     21.94 20.10 18.10 M6.5-M7 4 0
29 Haro 5-8 TT* 05 38 13.1534150256 -02 45 51.063950448   16.87 15.73 14.65 13.47 M1.5 39 0
30 2MASS J05381330-0251329 Or* 05 38 13.3087143912 -02 51 33.078206052   22.42 20.18 18.57 16.59 M5.0 12 0
31 [CH2010] CTIO J05381348-0236118 V* 05 38 13.48 -02 36 11.8           ~ 1 0
32 [KJN2005] 3.01 170 LM* 05 38 15.8995315848 -02 34 41.243988756 16.99 15.95 14.72 14.02 13.37 ~ 15 0
33 2MASS J05381610-0238049 Or* 05 38 16.1012119584 -02 38 04.982674128 20.46 19.65 18.09 16.77 15.09 M3.5 25 0
34 2MASS J05381741-0240242 Or* 05 38 17.4145740552 -02 40 24.296790180   23.24   19.21 17.09 M5/7V 26 0
35 2MASS J05381778-0240500 Y*O 05 38 17.7845776560 -02 40 50.095084908 18.94 19.81 18.14 16.76 14.94 M5.0 21 0
36 2MASS J05381824-0248143 TT* 05 38 18.2442312696 -02 48 14.391589104   18.14 16.68 15.54 14.15 M3.0 25 0
37 2MASS J05381834-0235385 Or* 05 38 18.3449438472 -02 35 38.571667512 20.863   22.91 20.49 18.08 M7 18 0
38 [CH2010] CTIO J05381870-0246582 V* 05 38 18.70 -02 46 58.2           ~ 2 0
39 Kiso A-0976 326 TT* 05 38 18.8587986024 -02 51 38.946956472   18.20 16.81 15.65 14.25 M2.5 36 0
40 [KJN2005] 4.03 511 LM* 05 38 19.1434271016 -02 35 27.923737632 17.86 16.48 15.02 14.21 13.47 G7.5 15 0
41 [W96] rJ053820-0237 TT* 05 38 20.2123248864 -02 38 01.667415300   19.07 17.47 16.08 14.27 M4-5e 32 0
42 [W96] rJ053820-0234 TT* 05 38 20.5029803016 -02 34 08.974652808   20.99 19.39 17.68 15.74 M4e 37 0
43 [BZR99] S Ori 31 Y*O 05 38 20.8792849368 -02 46 13.332049824         17.25 M4.0 24 0
44 Mayrit 994201 Y*O 05 38 20.8963469040 -02 51 28.110085848   21.43 20.88 19.18 17.08 M5.5 10 0
45 [CH2010] CTIO J05382129-0240318 EB* 05 38 21.2953239392 -02 40 31.758298754           ~ 3 0
46 2MASS J05382307-0236493 Y*O 05 38 23.0801723136 -02 36 49.399439220 18.99 19.61 18.45 17.01 15.64 M4.5 21 0
47 2MASS J05382332-0244142 Or* 05 38 23.3264911464 -02 44 14.244108288 20.38 19.75 18.18 16.84 15.12 M4.0 22 0
48 2MASS J05382354-0241317 Y*O 05 38 23.5472558472 -02 41 31.790861628 20.86 19.93 18.35 16.89 15.07 M4.5 23 0
49 [BZR99] S Ori 53 LM* 05 38 25.11744 -02 48 02.7720         20.99 M9V 13 0
50 V* V2728 Ori Or* 05 38 25.4373236808 -02 42 41.266014912   20.88 20.33 19.08 17.20 M7 38 0
51 V* V2729 Ori Or* 05 38 25.57752 -02 48 37.0224   21.09 24.40 22.07 19.54 M8.5V 31 0
52 2MASS J05382623-0240413 Or* 05 38 26.2365289464 -02 40 41.397150432   21.25 20.45 19.08 16.99 M4.5 20 0
53 [BNM2013] 93.03 227 LM* 05 38 26.8421837544 -02 38 46.108875228   21.26 19.73 18.09 16.09 M3.5 27 0
54 V* V505 Ori TT* 05 38 27.2560402224 -02 45 09.705640104     14.16 13.54 12.85 K7e 65 0
55 Kiso A-0976 329 TT* 05 38 27.5110120944 -02 35 04.225488108 18.90 18.59 17.17 15.92 14.37 M3.5e 42 0
56 2MASS J05382774-0243009 TT* 05 38 27.7455745104 -02 43 01.015059576     16.29 15.00 13.67 M3.0 23 0
57 2MASS J05382848-0246170 Y*O 05 38 28.4810793840 -02 46 17.145681492     17.72 16.26 15.06 ~ 5 0
58 Mayrit 803197 Y*O 05 38 28.9705540938 -02 48 47.321425377   25.83 20.83   17.01 M6 21 0
59 Haro 5-11 TT* 05 38 31.4247760176 -02 36 33.894690768 16.59 17.36 16.42 15.22 13.82 M3.5 26 0
60 [W96] rJ053831-0235 TT* 05 38 31.5873593664 -02 35 15.081924804 19.243 17.17 15.85 14.88 13.77 M0e 31 0
61 2MASS J05383160-0251268 Y*O 05 38 31.6006262928 -02 51 26.899822548   17.39 15.56 14.52 13.57 K6.0 6 0
62 [W96] rJ053832-0235b TT* 05 38 32.8464506040 -02 35 39.259582728 17.600 15.90 14.59 13.74 12.88 K6.0 29 0
63 2MASS J05383302-0239279 Y*O 05 38 33.0312992280 -02 39 28.098882468   20.66   17.74 16.17 M2.0 7 0
64 UCAC2 30800073 TT* 05 38 33.3605595192 -02 36 17.684774892 18.08 17.30 15.83 14.72 13.40 M2.5 25 0
65 2MASS J05383388-0245078 Or* 05 38 33.8862184536 -02 45 07.883316756   20.66 19.58 17.95 16.27 ~ 17 0
66 [W96] rJ053833-0236 TT* 05 38 34.0608899664 -02 36 37.589513328 19.530   16.39 15.24 13.72 M3-M4e 41 0
67 2MASS J05383460-0241087 TT* 05 38 34.6040244960 -02 41 08.823514236 18.85 19.71 17.76 16.62 15.00 M2.0 27 0
68 [BNM2013] 93.03 22 LM* 05 38 36.6927137808 -02 44 13.727328324 19.83 19.11 17.55 16.13 14.33 M2.6 29 0
69 2MASS J05383745-0250236 TT* 05 38 37.4496621408 -02 50 23.674758180   19.33 17.85 16.43 14.66 M4.5 31 0
70 2MASS J05383858-0241558 Or* 05 38 38.5944218448 -02 41 55.925390112 20.86 21.50 19.80 18.31 16.42 M5.5e 39 0
71 2MASS J05383902-0245321 TT* 05 38 39.0315633456 -02 45 32.214599712     17.26 15.92 14.58 M2.5 41 0
72 2MASS J05383922-0253084 Y*O 05 38 39.2266254336 -02 53 08.408116104     15.54 14.69 13.88 G4.5 14 0
73 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
74 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 855 0
75 Mayrit 489165 TT* 05 38 53.180280 -02 43 52.99500 18.36 17.19 15.62 15.27 13.68 M1.0 20 0
76 [BMZ2001] S Ori J053853.8-024459 * 05 38 53.8213040688 -02 44 58.915883652         17.68 M6-M6.5 7 0
77 2MASS J05385492-0240337 Y*? 05 38 54.9260666208 -02 40 33.828612204     23.22 20.88 18.64 M8 8 0
78 2MASS J05385492-0228583 Or* 05 38 54.9292657368 -02 28 58.375755156 21.05 20.21 18.61 17.22 15.48 M4.5 43 0
79 2MASS J05385542-0241208 Y*? 05 38 55.4275077936 -02 41 20.856750756     21.25   18.59 M5.5 15 0
80 [KJN2005] 1.02 91 LM* 05 38 56.2337503200 -02 31 15.413648232 18.68 17.57 16.16 15.37 14.60 ~ 4 0
81 Haro 5-18 TT* 05 38 59.2270703712 -02 33 51.416508384 18.648 17.62 16.55 15.59 14.43 M2.5 37 0
82 UCAC2 30800145 * 05 38 59.4623020704 -02 42 19.711341648 15.08 14.86 14.00 13.46 12.94 K0 10 0
83 [CH2010] CTIO J05390031-0237059 V* 05 39 00.312 -02 37 05.86 19.716         ~ 3 0
84 [W96] 4771-1056 Y*O 05 39 00.5298756288 -02 39 39.085792200 14.96 14.43 13.52 12.99 12.49 G3.5 14 0
85 2MASS J05390115-0236388 Or* 05 39 01.1575458936 -02 36 38.885743908 19.061 19.45 18.04 16.70 15.11 ~ 22 0
86 2MASS J05390193-0235029 Y*O 05 39 01.9391478912 -02 35 02.905186848 19.818 20.72 19.68 18.46 17.11 M4 27 0
87 2MASS J05390276-0229558 TT* 05 39 02.7719014080 -02 29 55.865251140 19.981 18.56 16.98 15.76 14.21 M4.0 31 0
88 [BZR99] S Ori 51 LM* 05 39 03.20592 -02 30 19.9440         20.32 M9Ve 18 0
89 ESO-HA 1693 TT* 05 39 03.5780102112 -02 46 27.054378984   18.04 16.94 15.82 14.37 M3.5 32 0
90 [BZR99] S Ori 17 Y*O 05 39 04.4949780000 -02 38 35.381301036     20.00 18.92 16.80 M6 17 0
91 UCAC4 437-010938 TT* 05 39 04.5914072832 -02 41 49.316692020 17.20 17.44 16.39 15.51 14.53 M0.0 18 0
92 2MASS J05390524-0233005 Or* 05 39 05.2462706112 -02 33 00.594522684 20.41 19.36 17.89 16.58 14.97 ~ 22 0
93 [W96] 4771-1075 TT* 05 39 05.4085005984 -02 32 30.366192804 17.541 15.79 14.42 13.54 12.70 K7e 51 0
94 [CH2010] CTIO J05390664-0238050 V* 05 39 06.6434133912 -02 38 05.078233752         16.95 ~ 2 0
95 [W96] rJ053907-0228 TT* 05 39 07.5918979680 -02 28 23.408982264 19.14 18.52 16.98 15.79 14.36 M3e 32 0
96 Haro 5-19 TT* 05 39 07.6049425848 -02 32 39.192952344 16.743 15.24 13.99 13.18 12.41 K6.5 37 0
97 2MASS J05390808-0228447 Y*O 05 39 08.0900406592 -02 28 44.831657458 19.34 19.57 18.69 17.56 15.88 M4.0 20 0
98 [BZR99] S Ori 7 Y*O 05 39 08.2185362880 -02 32 28.467592548 20.85 20.61 19.10 17.55 15.70 M5-M5.5 23 0
99 2MASS J05390878-0231115 TT* 05 39 08.7813079488 -02 31 11.585111808 18.78 19.27 18.11 16.82 15.30 M3.0 33 0
100 [BZR99] S Ori 25 Or* 05 39 08.9497481544 -02 39 57.986417520     21.09 19.34 17.02 M6.5V 26 0
101 [HHM2007] 916 * 05 39 09.8811757464 -02 38 16.547139132           ~ 3 0
102 [KJN2005] 33 Or* 05 39 10.0137047592 -02 28 11.596588608 21.26 20.55 19.01 17.71 16.10 M5 14 0
103 Mayrit 552137 LM* 05 39 10.0395544056 -02 42 42.548117220 19.60 17.90 16.14 15.17 14.31 K2.0 18 0
104 [BZR99] S Ori 50 LM* 05 39 10.80408 -02 37 14.5884         20.52 M9V 12 0
105 Mayrit 425070 Or* 05 39 11.4017533992 -02 33 32.831052984 21.773 21.52 19.94 18.32 16.43 M5e 37 0
106 Haro 5-20 TT* 05 39 11.5179186744 -02 31 06.580001460 18.295 16.98 15.45 14.56 13.56 M0.0 43 0
107 [W96] 4771-1038 TT* 05 39 11.6324490456 -02 36 02.883889440 16.242 15.82 14.47 13.61 12.75 K7e 31 0
108 2MASS J05391232-0230064 TT* 05 39 12.3264257688 -02 30 06.489568440   19.70 18.17 16.57 14.63 M5.0 23 0
109 [BZR99] S Ori 30 Y*O 05 39 13.0855893696 -02 37 50.971269108     20.74 19.34 17.30 M6 22 0
110 2MASS J05391346-0237391 Y*O 05 39 13.4673270624 -02 37 39.157408020   19.95 18.33 16.88 15.13 M4.0 13 0
111 [BNM2013] 90.02 109 LM* 05 39 14.4706680864 -02 28 33.421367604 20.561 19.11 17.52 16.30 14.82 M3.5e 19 0
112 [BZR99] S Ori 16 Y*O 05 39 15.1041343392 -02 40 47.667633204 20.73 21.97   18.73 16.74 M3.5 15 0
113 [BZR99] S Ori 26 * 05 39 15.765 -02 38 26.22         17.12 M4.5 8 0
114 [BNM2013] 90.02 146 LM* 05 39 15.8295100056 -02 36 50.763469176 20.13 19.25 17.70 16.41 14.85 M4.0 25 0
115 2MASS J05391699-0241171 Y*O 05 39 17.0054002728 -02 41 17.198587896 20.56 20.51 18.86 17.52 15.92 ~ 10 0
116 Haro 5-21 TT* 05 39 18.8360108640 -02 30 53.221941684 17.563 15.88 14.41 13.49 12.60 K7.0 41 0
117 2MASS J05392023-0238258 Y*O 05 39 20.2371430800 -02 38 25.948061736 21.41 20.82 18.97 17.45 15.55 M5.5 35 0
118 [BZR99] S Ori 3 LM* 05 39 20.9751873360 -02 30 33.534650772   20.66 19.25 17.58 15.57 ~ 25 0
119 2MASS J05392174-0244038 Y*O 05 39 21.7480163784 -02 44 03.895370052     14.11 13.22 12.746 G2.0 15 0
120 [HHM2007] 1013 Y*O 05 39 22.2517241688 -02 45 52.469702748         17.15 ~ 10 0
121 [W96] rJ053923-0233 TT* 05 39 22.8701215704 -02 33 33.120077976 19.264 18.19 16.56 15.47 14.19 M2e 31 0
122 [BZR99] S Ori 28 Or* 05 39 23.1926611128 -02 46 55.782192540   22.63 21.06 19.41 17.23 M5.5 24 0
123 [BZR99] S Ori 42 Y*? 05 39 23.4322728408 -02 40 57.579062268         19.18 M7.5 11 0
124 2MASS J05392435-0234013 TT* 05 39 24.3620556120 -02 34 01.413666480 19.394 18.19 16.62 15.53 14.28 M2.0 22 0
125 V* BG Ori TT* 05 39 25.2030748440 -02 38 22.059069252   15.88 14.72 13.78 12.83 K7.5 49 0
126 2MASS J05392524-0227479 Y*O 05 39 25.2478708680 -02 27 48.138665832 22.159 21.16 19.66 18.41 16.91 ~ 8 0
127 HH 446 HH 05 39 25.6055326344 -02 38 43.711548576         17.228 ~ 16 0
128 2MASS J05392561-0234042 Y*O 05 39 25.6109863608 -02 34 04.298936196 20.279 20.12 18.22 16.71 14.96 M5.5 18 0
129 2MASS J05392633-0228376 Y*O 05 39 26.3370825408 -02 28 37.711621812   19.69 18.02 16.96 15.26 M5 24 0
130 2MASS J05392677-0242583 Y*O 05 39 26.7736575624 -02 42 58.361461452   21.49 18.90 17.25 15.52 M2.3 26 0
131 [BZR99] S Ori 36 Or* 05 39 26.8571235120 -02 36 56.236094820   22.73     17.88 M6.5 19 0
132 2MASS J05393056-0238270 LM* 05 39 30.5686422432 -02 38 27.050390520   19.36 17.82 16.61 15.21 M2.5 11 0
133 2MASS J05393234-0227571 Y*O 05 39 32.3418950016 -02 27 57.173008572     14.10   12.682 G3.5 14 0
134 [BZR99] S Ori 21 Or* 05 39 34.3303193088 -02 38 46.937656932   21.01 21.12 19.27 17.29 ~ 20 0
135 [KJN2005] 1.01 237 * 05 39 36.7301998296 -02 31 58.979319240       18.734 17.249 ~ 3 0
136 [BZR99] S Ori 14 Or* 05 39 37.5942690888 -02 44 30.504555420   22.39 20.39 18.69 16.71 ~ 17 0
137 [BZR99] S Ori 4 Y*O 05 39 39.3176659728 -02 32 25.331200404 20.429 20.35 18.78 17.34 15.52 ~ 19 0
138 Haro 5-27 TT* 05 39 39.8261592024 -02 31 21.865624536 14.589   14.30 13.92 13.073 K5.5 93 0
139 V* V603 Ori Or* 05 39 39.8292920832 -02 33 16.040160936 19.253   16.70   13.91 K7 39 0
140 V* RW Ori TT* 05 39 39.9869752104 -02 43 09.749888724     13.32   11.956 K1.0 32 0
141 [HHM2007] 1162 Y*O 05 39 40.5765930984 -02 39 12.442432896   22.01 20.39 18.89 17.31 ~ 8 0
142 2MASS J05394318-0232433 Y*O 05 39 43.1842098840 -02 32 43.377953604 19.867 19.34 17.72 16.45 14.83 M4.5 31 0
143 2MASS J05394411-0231092 TT* 05 39 44.1088815936 -02 31 09.276693312     13.86   12.502 K1.5 14 0
144 [BZR99] S Ori 11 Y*O 05 39 44.3302873224 -02 33 02.834542764 21.137 20.75 20.11   16.46 M6 16 0
145 2MASS J05394725-0241359 Y*O 05 39 47.2516822416 -02 41 36.007602684   19.63 18.28 17.15 15.55 ~ 2 0
146 2MASS J05394770-0236230 Y*O 05 39 47.6960819856 -02 36 23.058152424 20.674   17.84 16.65 14.95 ~ 12 0
147 2MASS J05394784-0232248 TT* 05 39 47.8356697848 -02 32 24.946773792     13.75   12.256 M0.0 20 0
148 2MASS J05394799-0240320 TT* 05 39 47.9874032448 -02 40 32.111351436   17.86 16.38 15.23 13.83 M3.0 18 0
149 2MASS J05394806-0245571 Y*O 05 39 48.0536191608 -02 45 57.066349680   18.10 16.58 15.49 14.18 M2.5 15 0
150 [SE2004] 108 * 05 39 48.2648127648 -02 29 14.299216584   25.91   20.78 18.68 M7 12 0
151 2MASS J05394891-0229110 Y*O 05 39 48.915 -02 29 11.08   19.02 17.34 16.24 14.70 M3.0 9 0
152 CVSO 1889 TT* 05 39 50.3874781728 -02 43 30.807364080     15.04 14.06 13.085 M1.0 9 0
153 2MASS J05395056-0234137 Or* 05 39 50.5623676008 -02 34 13.783179504     18.39 17.14 15.24 ~ 20 0
154 2MASS J05395236-0236147 Y*O 05 39 52.3637295672 -02 36 14.838239700     16.81 15.70 14.22 M2.5 24 0
155 2MASS J05395248-0232023 TT* 05 39 52.4742665040 -02 32 02.388819408     14.25 13.53   K7.0 24 0
156 2MASS J05395313-0243083 Y*O 05 39 53.1287425272 -02 43 08.438894436     13.90   12.425 G2.0 15 0
157 Haro 5-32 TT* 05 39 53.6204045688 -02 33 42.724290960 16.971   16.92 15.84 14.32 M4 43 0
158 Mayrit 1045094 Y*O 05 39 54.3226700016 -02 37 18.974259444   20.61 20.81 19.05 17.05 M4.5 21 0
159 2MASS J05395645-0238034 Y*O 05 39 56.4511819824 -02 38 03.544254132     18.38 17.13 15.258 M5.0 16 0
160 2MASS J05395753-0232120 Y*O 05 39 57.5267067816 -02 32 12.111247752     18.14 16.94 14.91 ~ 17 0
161 2MASS J05400338-0229014 TT* 05 40 03.3823100424 -02 29 01.490562708     14.89 13.99 13.197 K7.0 22 0
162 Mayrit 1196092 Or* 05 40 04.5326246160 -02 36 42.088724028   20.69   19.94 17.73 M6 27 0
163 2MASS J05400525-0230522 Y*O 05 40 05.2553008224 -02 30 52.391019780 22.379 20.75 19.08 17.65 15.86 M5 21 0
164 2MASS J05400708-0232446 Y*O 05 40 07.0812259272 -02 32 44.774476332 20.848   18.09 16.83 15.00 ~ 15 0
165 2MASS J05400867-0232432 Y*O 05 40 08.6702174496 -02 32 43.318116744     17.16 15.74 13.900 M5.5 23 0
166 V* V608 Ori TT* 05 40 08.8861654944 -02 33 33.783037632     14.63 14.09 13.907 K7.5 51 0
167 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
168 NGC 2362 OpC 07 18 41.9 -24 57 08           ~ 428 0
169 NGC 2363 AG? 07 28 29.59 +69 11 34.3   15.5       ~ 262 1
170 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
171 NGC 2818 OpC 09 16 10.8 -36 37 09           ~ 108 1
172 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1

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