2023ApJ...951..139D

Query : 2023ApJ...951..139D

2023ApJ...951..139D - Astrophys. J., 951, 139 (2023/July-2)

A Novel Survey for Young Substellar Objects with the W-band Filter. VI. Spectroscopic Census of Substellar Members and the IMF of the σ Orionis Cluster.

DAMIAN B., JOSE J., BILLER B., HERCZEG G.J., ALBERT L., ALLERS K., ZHANG Z., LIU M.C., DUBBER S., PAUL K.T., CHEN W.-P., LALCHAND B., SHARMA T. and OASA Y.

Abstract (from CDS):

Low-mass stars and substellar objects are essential in tracing the initial mass function (IMF). We study the nearby young σ Orionis cluster (d ∼ 408 pc, age ∼ 1.8 Myr) using deep near-infrared (NIR) photometric data in the J, W, and H bands from WIRCam on the Canada-France-Hawaii Telescope. We use the water absorption feature to select brown dwarfs photometrically and confirm their nature spectroscopically with IRTF-SpeX. Additionally we select candidate low-mass stars for spectroscopy and analyze their membership and those of literature sources using astrometry from Gaia DR3. We obtain NIR spectra for 28 very-low-mass stars and brown dwarfs and estimate their spectral type between M3 and M8.5 (masses ranging between 0.3 and 0.01 M⊙). Apart from these, we also identify five new planetary-mass candidates which require further spectroscopic confirmation of youth. We compile a comprehensive catalog of 170 spectroscopically confirmed members in the central region of the cluster, for a wide mass range of ∼19-0.004 M☉. We estimate the star-to-brown-dwarf ratio to be ∼4, within the range reported for other nearby star-forming regions. With the updated catalog of members we trace the IMF down to 4 MJup and we find that a two-segment power law fits the substellar IMF better than a log-normal distribution.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Brown dwarfs - Initial mass function - Star forming regions - Low mass stars

VizieR on-line data: <Available at CDS (J/ApJ/951/139): table1.dat table2.dat sp/*>

Nomenclature: Tables 1-2: WBIS JHHMMSS.s+DDMMSS.s N=175.

Simbad objects: 195

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Number of rows : 195
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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 LDN 1471 DNe 03 48.0 +32 54           ~ 349 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
5 HD 34733 * 05 19 39.6977781216 +00 50 11.357128212   9.09 8.99     A1V 15 0
6 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 372 0
7 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 281 0
8 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
9 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
10 NAME Ori Complex Cld 05 35.3 -05 23           ~ 481 0
11 WBIS J053803.2-022656.7 * 05 38 03.23 -02 26 56.8           ~ 3 0
12 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
13 Kiso A-0904 67 TT* 05 38 06.7453899264 -02 30 22.745385900 17.703 16.46 15.08 14.08 13.14 M1 40 0
14 [BZR99] S Ori 44 * 05 38 07.126 -02 43 21.05   22.29 23.54 21.54 19.64 M7 8 0
15 UCAC2 30800015 TT* 05 38 07.8452154168 -02 31 31.350308952 15.277   12.72   11.41 K3.0 22 0
16 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
17 [HHM2007] 395 * 05 38 12.6447076872 -02 36 37.768803876     21.94 20.10 18.10 M6.5-M7 4 0
18 2MASS J05381319-0226088 TT* 05 38 13.1972684896 -02 26 08.655719751   18.41 16.92 15.67 14.10 M4.5 29 0
19 [BZR99] S Ori 13 Y*O 05 38 13.2091054320 -02 24 07.556361588   21.07 19.68 18.06 16.13 M5.5 16 0
20 [BZR99] S Ori 47 BD* 05 38 14.62416 -02 40 15.4020         20.53 L1e 29 0
21 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
22 2MASS J05381741-0240242 Or* 05 38 17.4145740552 -02 40 24.296790180   23.24   19.21 17.09 M5/7V 26 0
23 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
24 2MASS J05381834-0235385 Or* 05 38 18.3449438472 -02 35 38.571667512 20.863   22.91 20.49 18.08 M7 18 0
25 [W96] rJ053820-0237 TT* 05 38 20.2123248864 -02 38 01.667415300   19.07 17.47 16.08 14.27 M4-5e 32 0
26 [W96] rJ053820-0234 TT* 05 38 20.5029803016 -02 34 08.974652808   20.99 19.39 17.68 15.74 M4e 37 0
27 Mayrit 379292 Or* 05 38 21.3850973592 -02 33 36.302074596     20.78 19.47 17.45 M6 18 0
28 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
29 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
30 V* V2725 Ori Or* 05 38 23.3366740776 -02 25 34.605441120   19.60 18.40 17.22 15.69 M2.0 27 0
31 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
32 V* V2728 Ori Or* 05 38 25.4373236808 -02 42 41.266014912   20.88 20.33 19.08 17.20 M7 38 0
33 [BZR99] S Ori 18 Or* 05 38 25.6854086976 -02 31 21.716183784     19.99 18.68 16.59 M3.5 20 0
34 [BZR99] S Ori 65 BD* 05 38 26.1 -02 23 05         23.23 L3.5: 12 0
35 2MASS J05382623-0240413 Or* 05 38 26.2365289464 -02 40 41.397150432   21.25 20.45 19.08 16.99 M4.5 20 0
36 WBIS J053826.8-024514.0 LM* 05 38 26.8 -02 45 14           ~ 1 0
37 [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
38 V* V505 Ori TT* 05 38 27.2560402224 -02 45 09.705640104     14.16 13.54 12.85 K7e 65 0
39 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
40 HD 294273 Y*O 05 38 27.5257761480 -02 43 32.615288688   10.89 10.81   10.396 A8.0 27 0
41 2MASS J05382774-0243009 TT* 05 38 27.7455745104 -02 43 01.015059576     16.29 15.00 13.67 M3.0 23 0
42 [W96] rJ053828-0236 TT* 05 38 29.1236063736 -02 36 02.754623664 19.390 17.83 16.28 15.22 13.98 M1.5 30 0
43 WBIS J053829.5-022937.0 * 05 38 29.52 -02 29 37.0           ~ 3 0
44 WBIS J053829.6-022337.8 LM* 05 38 29.5 -02 23 38           ~ 1 0
45 [BZR99] S Ori 29 Or* 05 38 29.6185929264 -02 25 14.270648484   21.05 20.72 19.02 17.02 M4.0 21 0
46 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
47 [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
48 UGCS J053832.13-023243.0 Y*O 05 38 32.1355866672 -02 32 43.115342352   20.69 18.84 18.8 18.95 M5.0 16 0
49 [BZR99] S Ori 39 Or* 05 38 32.4445347456 -02 29 57.296432760 21.027 22.98   19.77 17.71 M6.5 19 0
50 [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
51 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
52 V* TX Ori TT* 05 38 33.6879729168 -02 44 14.166027204 13.75 13.16 12.06 11.38 10.73 K4.5 59 0
53 2MASS J05383388-0245078 Or* 05 38 33.8862184536 -02 45 07.883316756   20.66 19.58 17.95 16.27 ~ 17 0
54 [W96] rJ053833-0236 TT* 05 38 34.0608899664 -02 36 37.589513328 19.530   16.39 15.24 13.72 M3-M4e 41 0
55 HD 294272B Y*O 05 38 34.2313042656 -02 34 16.026938112   8.55 8.57   8.570 B8V 31 0
56 2MASS J05383431-0235000 TT* 05 38 34.3155897720 -02 35 00.166471512 17.079 15.25 13.95 13.13 12.35 K7.0 31 0
57 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
58 HD 294272A Y*O 05 38 34.8033395568 -02 34 15.788701740   8.41 8.39   8.400 B9.5III 38 0
59 [BNM2013] 92.01 46 LM* 05 38 35.2914210384 -02 33 13.186787976   18.92 18.49 17.58 15.87 M5.5 11 0
60 [BZR99] S Ori 22 Or* 05 38 35.3557024968 -02 25 22.268716356   22.52 20.73 18.91 16.87 M6e 19 0
61 [W96] rJ053835-0231 TT* 05 38 35.4679746552 -02 31 51.698592264 17.174 15.48 14.19 13.37 12.55 K7.0 32 0
62 2MASS J05383582-0233133 * 05 38 35.8317209904 -02 33 13.432913604   17.25 17.38   15.57 M5.5 8 0
63 [W96] 4771-1097 TT* 05 38 35.8728104976 -02 30 43.337476944 16.679 15.13 13.94 13.18 12.41 K6e 30 0
64 V* TY Ori TT* 05 38 35.8761712272 -02 43 51.225431052 16.39 15.25 13.88 13.08 12.32 K3.0 37 0
65 HD 294271 Y*O 05 38 36.5498973360 -02 33 12.757741200   7.78 7.88   7.990 B5V 42 0
66 2MASS J05383687-0236432 Y*O 05 38 36.8794609584 -02 36 43.316502912   19.36 18.18 16.76 14.89 M4.5 20 0
67 [W96] rJ053838-0236 TT* 05 38 38.2273375656 -02 36 38.502644580 17.054 15.35 14.09 13.25 12.38 K8e 31 0
68 [W96] 4771-1147 TT* 05 38 38.4905614800 -02 34 55.095652092 15.117 13.49 12.35 11.73 10.97 K2.0 32 0
69 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
70 2MASS J05383888-0228016 Y*O 05 38 38.8901286864 -02 28 01.718651352 20.95 21.83   18.77 16.99 M5Ve 25 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 [BZR99] S Ori 68 BD* 05 38 39.1 -02 28 05         23.77 L5: 25 1
73 2MASS J05383972-0240197 Y*O 05 38 39.7321268352 -02 40 19.762638060 20.69 20.16 18.70 17.28 15.48 M3.5 17 0
74 2MASS J05383976-0232203 Or* 05 38 39.7659382656 -02 32 20.386224312   21.83 21.75 19.72 17.52 M6.5-M7 18 0
75 Haro 5-13 TT* 05 38 40.2734966736 -02 30 18.558554472 17.937 16.91 15.49 14.48 13.46 M0e 41 0
76 2MASS J05384053-0233275 Y*O 05 38 40.5374992824 -02 33 27.596596968 19.58 18.95 17.65 16.28 14.52 M2.8 30 0
77 UCAC2 30800097 TT* 05 38 41.2928547432 -02 37 22.626301404 16.93 15.86 14.54 14.192 12.78 M0.0 34 0
78 [BNM2013] 92.01 23 LM* 05 38 41.3591638344 -02 36 44.554940316   17.76   15.86 14.45 M2.0 19 0
79 2MASS J05384146-0235523 LM* 05 38 41.4639619019 -02 35 52.351828481       18.57 16.15 M6 12 0
80 [BNM2013] 92.01 24 LM* 05 38 41.5981123056 -02 30 28.925398728 19.33 18.54 17.07 15.87 14.37 M2.1 29 0
81 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
82 UCAC2 30800102 TT* 05 38 42.2801182536 -02 37 14.821687344 17.36 16.69 15.27 14.27 13.22 M0.5 37 0
83 [HHM2007] 683 LM* 05 38 42.3945936408 -02 36 04.524810768       17.75 15.685 M6 13 0
84 2MASS J05384301-0236145 Y*O 05 38 43.0201961184 -02 36 14.636669328 12.79 14.23 14.87 14.28 13.30 M1.0 22 0
85 2MASS J05384333-0232008 TT* 05 38 43.3370878176 -02 32 00.861114372 21.747 18.95 17.31 15.90 14.06 M5.0 23 0
86 [W96] rJ053843-0233 TT* 05 38 43.5573033864 -02 33 25.441109640 17.743 16.52 15.14 14.16 13.07 M1 24 0
87 2MASS J05384386-0237068 TT* 05 38 43.8691779528 -02 37 06.911503896 13.559   17.93 16.59 14.80 M5.5 38 0
88 * sig Ori C Y*? 05 38 44.1189397296 -02 36 06.310060884   8.77 8.79   9.63 A2Vn 33 0
89 [W96] 4771-1051 TT* 05 38 44.2345372944 -02 40 19.771649184 15.88 15.24 14.02 13.22 12.41 K7.5/8e 42 0
90 2MASS J05384424-0232336 TT* 05 38 44.2435528320 -02 32 33.699347484 16.18 15.21 13.89 13.01 12.13 K7.0 26 0
91 2MASS J05384448-0240376 Y*O 05 38 44.4903051456 -02 40 37.731929160     21.37 19.41 17.24 M5 15 0
92 2MASS J05384449-0240305 Or* 05 38 44.4967508136 -02 40 30.571322556 20.10 19.26 17.75 16.51 14.91 ~ 21 0
93 * 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
94 Mayrit 89175 LM* 05 38 45.2785320048 -02 37 29.322067548     18.77 17.10 15.35 M5.5 18 0
95 Mayrit 21023 * 05 38 45.3035699832 -02 35 41.253591372         14.7 M5.5 10 0
96 V* V595 Ori TT* 05 38 45.37536 -02 41 59.4240 17.75 17.08 15.61 15.19 13.45 M1.5 29 0
97 * sig Ori D Y*O 05 38 45.6253355112 -02 35 58.894678824 5.7 6.51 6.69   6.98 B2V 67 0
98 2MASS J05384597-0245231 Y*O 05 38 45.9788793504 -02 45 23.198069628   20.35 19.04   15.69 M5.0 17 0
99 [BNM2013] 90.02 216 LM* 05 38 46.8532193544 -02 36 43.607139732 13.332 15.86 16.63 16.61 15.20 M5.0 23 0
100 [W96] pJ053847-0234 TT* 05 38 47.1886997424 -02 34 36.917448204 17.17 18.43 17.36 16.38 14.81 M4.0 25 0
101 * sig Ori E Y*O 05 38 47.2050040320 -02 35 40.521424812 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 486 0
102 WBIS J053847.3-023605.6 LM* 05 38 47.3 -02 36 05           ~ 2 0
103 UCAC4 438-011202 TT* 05 38 47.4634997136 -02 35 25.322448264 12.01 14.96 14.82 15.071 13.10 M0.5 26 0
104 2MASS J05384755-0227120 Y*O 05 38 47.5456806504 -02 27 12.033175788 19.62 19.01 17.53 16.00 14.11 M3.5 30 0
105 [BZR99] S Ori 6 Or* 05 38 47.6632499544 -02 30 37.481740308 20.977 20.25   17.30 15.38 M5.5 23 0
106 [W96] 4771-899 TT* 05 38 48.0364463496 -02 27 14.149731420 16.327 14.490 13.254 12.630 11.54 K7e 33 0
107 [BZR99] S Ori 15 Or* 05 38 48.0991320696 -02 28 53.682649428 21.11 21.32 19.89 18.32 16.42 M5.5e 26 0
108 2MASS J05384818-0244007 Or* 05 38 48.1903491768 -02 44 00.860001936 21.27 21.43 19.76 18.11 16.13 M6.5 22 0
109 2MASS J05384828-0236409 Y*O 05 38 48.2919091608 -02 36 41.075987652 14.930 17.29   15.60 13.89 M4.5 19 0
110 [BNM2013] 90.02 90 LM* 05 38 48.6872974992 -02 36 16.297363080 13.474   15.45 14.24 13.37 M1.5 22 0
111 [W96] rJ053849-0238 TT* 05 38 49.1743174560 -02 38 22.302143052 17.35 16.22 14.87 13.93 12.91 M0.5e 27 0
112 2MASS J05384921-0241251 TT* 05 38 49.2233239032 -02 41 25.201346748     15.98 14.73 13.23 M3.5 28 0
113 V* V2737 Ori Or* 05 38 49.2830405880 -02 23 57.624853740 22.321 23.90 19.39 17.67 16.90 M3.8V 27 0
114 2MASS J05384970-0234526 Y*O 05 38 49.7044756272 -02 34 52.679689680   19.12 17.96 16.84 14.79 M5 24 0
115 2MASS J05384993-0241228 TT* 05 38 49.9362109848 -02 41 22.889892552 19.21 18.27 16.76 15.59 14.16 M3.0 29 0
116 2MASS J05385003-0237354 Y*O 05 38 50.0383707336 -02 37 35.548478076 19.47 18.95 18.00 16.69 14.93 M5.5 27 0
117 2MASS J05385038-0226477 TT* 05 38 50.3806143456 -02 26 47.716947420 19.775 18.37 16.79 15.56 14.05 M3.5 21 0
118 2MASS J05385060-0242429 Or* 05 38 50.6088010368 -02 42 42.960276072   21.04 19.42 17.80 15.85 ~ 24 0
119 [BNM2013] 90.02 362 LM* 05 38 50.7819191472 -02 36 26.805329712 18.816 18.76   16.98 15.12 M3.0 21 0
120 [BNM2013] 90.02 91 LM* 05 38 51.4560020472 -02 36 20.641613616 16.090 18.23 17.47 16.09 14.38 K5V 22 0
121 [BNM2013] 90.02 293 LM* 05 38 51.7468872456 -02 36 03.425317272 15.494 19.63 17.89 16.84 15.04 M6-M6.5 20 0
122 WBIS J053852.6-023215.5 * 05 38 52.6 -02 32 15         18.88 M6-M6.5 4 0
123 [BZR99] S Ori 61 BD* 05 38 52.69032 -02 28 43.9032         22.78 L0: 5 0
124 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
125 [W96] 4771-1049 Y*O 05 38 53.3786496600 -02 33 23.078055204 15.736 14.21 13.05 12.30 11.59 K3 19 0
126 [BMZ2001] S Ori J053853.8-024459 * 05 38 53.8213040688 -02 44 58.915883652         17.68 M6-M6.5 7 0
127 2MASS J05385492-0240337 Y*? 05 38 54.9260666208 -02 40 33.828612204     23.22 20.88 18.64 M8 8 0
128 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
129 2MASS J05385542-0241208 Y*? 05 38 55.4275077936 -02 41 20.856750756     21.25   18.59 M5.5 15 0
130 UGCS J053857.52-022905.5 NIR 05 38 57.51 -02 29 05.5           ~ 4 0
131 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
132 2MASS J05385955-0245080 Y*O 05 38 59.5592540088 -02 45 08.197736328     12.520 12.08 11.69 F4.5 17 0
133 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 25 0
134 [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
135 2MASS J05390115-0236388 Or* 05 39 01.1575458936 -02 36 38.885743908 19.061 19.45 18.04 16.70 15.11 ~ 22 0
136 HD 37525 Y*O 05 39 01.4927799048 -02 38 56.364214344   7.98 8.06   8.210 B5V 95 1
137 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
138 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
139 UCAC4 437-010930 TT* 05 39 02.9786833104 -02 41 27.164775444 17.71 17.87 16.51 15.33 13.93 M2.5 32 0
140 [BZR99] S Ori 51 LM* 05 39 03.20592 -02 30 19.9440         20.32 M9Ve 18 0
141 [BZR99] S Ori 58 BD* 05 39 03.59736 -02 25 36.6060         21.50 L0e 14 0
142 [BZR99] S Ori 17 Y*O 05 39 04.4949780000 -02 38 35.381301036     20.00 18.92 16.80 M6 17 0
143 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
144 2MASS J05390524-0233005 Or* 05 39 05.2462706112 -02 33 00.594522684 20.41 19.36 17.89 16.58 14.97 ~ 22 0
145 [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
146 [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
147 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
148 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
149 [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
150 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
151 [BZR99] S Ori 25 Or* 05 39 08.9497481544 -02 39 57.986417520     21.09 19.34 17.02 M6.5V 26 0
152 [BZR99] S Ori 50 LM* 05 39 10.80408 -02 37 14.5884         20.52 M9V 12 0
153 Mayrit 425070 Or* 05 39 11.4017533992 -02 33 32.831052984 21.773 21.52 19.94 18.32 16.43 M5e 37 0
154 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
155 [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
156 2MASS J05391183-0227409 Y*O 05 39 11.8349306400 -02 27 41.009358564 20.843 19.55 18.04 16.81 15.16 M4.5 23 0
157 2MASS J05391232-0230064 TT* 05 39 12.3264257688 -02 30 06.489568440   19.70 18.17 16.57 14.63 M5.0 23 0
158 2MASS J05391289-0224537 Y*? 05 39 12.8832672840 -02 24 53.463700008   22.75   21.04 18.94 M6 8 0
159 [BZR99] S Ori 30 Y*O 05 39 13.0855893696 -02 37 50.971269108     20.74 19.34 17.30 M6 22 0
160 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
161 WBIS J053913.8-023145.6 LM* 05 39 13.8 -02 31 45           M8-M8.5 1 0
162 [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
163 [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
164 [BZR99] S Ori 26 * 05 39 15.765 -02 38 26.22         17.12 M4.5 8 0
165 [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
166 Kiso A-0904 80 TT* 05 39 17.176752 -02 25 43.36716 19.748 18.25 16.40 16.02 14.18 M1.5 23 0
167 WBIS J053918.0-022936.4 LM* 05 39 18.0 -02 29 36           ~ 1 0
168 2MASS J05391807-0229284 Y*O 05 39 18.0734290944 -02 29 28.520484936 14.474 13.57 12.60 12.05 11.53 G7.5 28 0
169 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
170 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
171 2MASS J05392044-0227368 TT* 05 39 20.4494141808 -02 27 36.860094396 18.900 17.43 15.93 14.81 13.52 M2e 27 0
172 [BZR99] S Ori 3 LM* 05 39 20.9751873360 -02 30 33.534650772   20.66 19.25 17.58 15.57 ~ 25 0
173 [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
174 [BZR99] S Ori 42 Y*? 05 39 23.4322728408 -02 40 57.579062268         19.18 M7.5 11 0
175 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
176 V* BG Ori TT* 05 39 25.2030748440 -02 38 22.059069252   15.88 14.72 13.78 12.83 K7.5 49 0
177 [BNM2013] 90.02 73 LM* 05 39 25.3454561136 -02 31 43.714542720 19.154   15.48 14.56 14.010 G3.5 14 0
178 HH 446 HH 05 39 25.6055326344 -02 38 43.711548576         17.228 ~ 16 0
179 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
180 2MASS J05392633-0228376 Y*O 05 39 26.3370825408 -02 28 37.711621812   19.69 18.02 16.96 15.26 M5 24 0
181 2MASS J05392647-0226154 TT* 05 39 26.4735626208 -02 26 15.515569860   18.55 17.08 15.98 14.81 M1.5 17 0
182 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
183 [BZR99] S Ori 36 Or* 05 39 26.8571235120 -02 36 56.236094820   22.73     17.88 M6.5 19 0
184 WBIS J053927.4-022759.5 LM* 05 39 27.4 -02 27 59           ~ 1 0
185 UCAC4 438-011271 TT* 05 39 29.3528446680 -02 27 21.038927076         14.807 M0.0 35 0
186 UCAC2 30800213 TT* 05 39 32.5740847344 -02 39 44.034178500     13.64 13.07 12.38 K7.0 26 0
187 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 555 0
188 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
189 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
190 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
191 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
192 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
193 [HCP2006] Cluster A Cld 18 29 56 +01 14.8           ~ 50 0
194 NAME Serpens South Cluster Cl* 18 30 03.00 -02 01 58.2           ~ 148 0
195 Ass Ori OB 1a As* ~ ~           ~ 237 0

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