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2010A&A...521A..45C

Query : 2010A&A...521A..45C

2010A&A...521A..45C - Astronomy and Astrophysics, volume 521, A45-45 (2010/10-1)

HRC-I/Chandra X-ray observations towards σ Orionis.

CABALLERO J.A., ALBACETE-COLOMBO J.F. and LOPEZ-SANTIAGO J.

Abstract (from CDS):

We investigated the X-ray emission from young stars and brown dwarfs in the σ Orionis cluster (τ∼3Ma, d∼385pc) and its relation to mass, the presence of circumstellar discs, and separation to the cluster centre by taking advantage of the superb spatial resolution of the Chandra X-ray Observatory. We used public HRC-I/Chandra data from a 97.6ks pointing towards the cluster centre and complemented them with X-ray data from IPC/Einstein, HRI/ROSAT, EPIC/XMM-Newton, and ACIS-S/Chandra together with optical and infrared photometry and spectroscopy from the literature and public catalogues. On our HRC-I/Chandra data, we measured count rates, estimated X-ray fluxes, and searched for short-term variability. We also looked for long-term variability by comparing with previous X-ray observations. Among the 107 detected X-ray sources, there were 70 cluster stars with known signposts of youth, two young brown dwarfs, 12 cluster member candidates, four field dwarfs, and two galaxies with optical-infrared counterpart. The remaining sources were extragalactic. Based on a robust Poisson-χ2 analysis, nine cluster stars displayed flares or rotational modulation during the HRC-I observations, while eight other stars and one brown dwarf showed X-ray flux variations between the HRC-I and IPC, HRI, and EPIC epochs. We constructed a cluster X-ray luminosity function from O9.5 (about 18M☉) to M6.5 (about 0.06M☉). We found: (i) that early-type stars in multiple systems or with spectroscopic peculiarities tend to display X-ray emission; (ii) that the two detected brown dwarfs and the least-massive star are among the σ Orionis objects with the highest LX/LJ ratios; and (iii) that a large fraction of known classical T Tauri stars in the cluster are absent in this and other X-ray surveys. Finally, from a spatial distribution analysis, we quantified the impact of sensitivity degradation towards the HRC-I borders on the detection of faint X-ray sources and concluded that dozens X-ray σ Orionis stars and brown dwarfs still need to be detected.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - stars: early-type - stars: flare - stars: variables: T Tauri, Herbig Ae/Be - X-rays: stars - open clusters and associations: individual: σ Orionis

VizieR on-line data: <Available at CDS (J/A+A/521/A45): tablec1.dat tablec2.dat tablec3.dat>

Simbad objects: 163

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Number of rows : 163
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 828 1
2 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1407 1
3 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1368 1
4 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3354 0
5 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 2992 0
6 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4248 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2268 0
8 2E 1448 G 05 37 27.9273669816 -02 40 03.236373948         16.186 ~ 3 0
9 HD 37333 Y*O 05 37 40.4746109712 -02 26 36.837308472   8.59 8.51   8.420 A1Va(Si) 48 0
10 2MASS J05375161-0235257 Y*O 05 37 51.6115361832 -02 35 25.689580476 18.636   15.64 14.56 13.34 M2.0 25 0
11 [W96] 4771-775 * 05 37 52.1 -02 40 40           ~ 1 0
12 [W96] 4771-921 Y*O 05 37 53.0357554200 -02 33 34.398831816 13.379 12.35 11.64   10.70 G2.5 20 0
13 TYC 4771-921-1 Y*O 05 37 54.4037119440 -02 39 29.792935836   11.80 10.91   10.274 G5.0 20 0
14 2MASS J05375630-0245130 G 05 37 56.3078466240 -02 45 13.187592216         16.734 ~ 9 0
15 [FPS2006] NX 46 X 05 38.0 -02 30           ~ 3 0
16 [FPS2006] NX 123 X 05 38.0 -02 30           ~ 1 0
17 2MASS J05380055-0245097 Y*O 05 38 00.5578708440 -02 45 09.799560396   19.09 17.61 16.31 14.54 M5.0 17 0
18 2MASS J05380167-0225527 Y*O 05 38 01.6745166792 -02 25 52.784958720   18.71 17.21 16.01 14.54 M3.0 14 0
19 2MASS J05380649-0228494 Y*O 05 38 06.4951983744 -02 28 49.454544612 12.715 11.76 11.38   10.741 F3.5 16 0
20 Kiso A-0904 67 Y*O 05 38 06.7453899264 -02 30 22.745385900 17.703 16.46 15.08 14.08 13.14 M1 27 0
21 2MASS J05380784-0231314 Y*O 05 38 07.8452154168 -02 31 31.350308952 15.277   12.72   11.41 K3.0 16 0
22 Kiso A-0976 316 Y*O 05 38 08.2658566896 -02 35 56.276354400 18.050   16.19 15.08 13.76 M2.5 26 0
23 2MASS J05381319-0226088 Y*O 05 38 13.1972684896 -02 26 08.655719751   18.41 16.92 15.67 14.10 M4.5 23 0
24 [W96] rJ053813-0234 * 05 38 13.9 -02 34 57           ~ 1 0
25 [BZR99] S Ori 43 * 05 38 13.9590316104 -02 35 01.288893300         18.99 ~ 7 0
26 [BNM2013] 92.01 101 LM* 05 38 14.2291137024 -02 35 07.331244612 17.589     14.58 13.99 ~ 3 0
27 [W96] rJ053814-0236 * 05 38 14.6 -02 36 37           ~ 1 0
28 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 19 0
29 2MASS J05381834-0235385 Y*O 05 38 18.3449438472 -02 35 38.571667512 20.863   22.91 20.49 18.08 ~ 15 0
30 [W96] rJ053820-0237 LM* 05 38 20.2123248864 -02 38 01.667415300   19.07 17.47 16.08 14.27 M4-5e 23 0
31 2MASS J05382332-0244142 Y*O 05 38 23.3264911464 -02 44 14.244108288 20.38 19.75 18.18 16.84 15.12 M4.0 16 0
32 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 19 0
33 UCAC2 30800055 SB* 05 38 26.410320 -02 34 28.57620 14.878 13.85 13.05 12.87 12.07 ~ 9 0
34 V* V505 Ori Or* 05 38 27.2560402224 -02 45 09.705640104     14.16 13.54 12.85 K7e 46 0
35 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 29 0
36 [BNM2013] 93.03 46 LM* 05 38 27.7455745104 -02 43 01.015059576     16.29 15.00 13.67 M3.0 15 0
37 [W96] rJ053828-0236 LM* 05 38 29.1236063736 -02 36 02.754623664 19.390 17.83 16.28 15.22 13.98 M1.5 20 0
38 2MASS J05382993-0223381 Y*O 05 38 29.9315582112 -02 23 38.222740212     13.20     ~ 6 0
39 Haro 5-11 TT* 05 38 31.4247760176 -02 36 33.894690768 16.59 17.36 16.42 15.22 13.82 M3.5 23 0
40 [W96] rJ053831-0235 TT* 05 38 31.5873593664 -02 35 15.081924804 19.243 17.17 15.85 14.88 13.77 M0e 25 0
41 [KJN2005] 3.01 325 LM* 05 38 32.6825193144 -02 31 15.666624804 15.46 15.13 14.29 13.79 13.30 ~ 7 0
42 [W96] rJ053832-0235b LM* 05 38 32.8464506040 -02 35 39.259582728 17.600 15.90 14.59 13.74 12.88 K6.0 22 0
43 2MASS J05383335-0236176 Y*O 05 38 33.3605595192 -02 36 17.684774892 18.08 17.30 15.83 14.72 13.40 M2.5 18 0
44 V* TX Ori Or* 05 38 33.6879729168 -02 44 14.166027204 13.75 13.16 12.06 11.38 10.73 K4.5 42 0
45 [W96] rJ053833-0236 TT* 05 38 34.0608899664 -02 36 37.589513328 19.530   16.39 15.24 13.72 M3-M4e 34 0
46 HD 294272B Y*O 05 38 34.2313042656 -02 34 16.026938112   8.55 8.57   8.570 B8V 23 0
47 2MASS J05383431-0235000 TT* 05 38 34.3155897720 -02 35 00.166471512 17.079 15.25 13.95 13.13 12.35 K7.0 21 0
48 HD 294272A Y*O 05 38 34.8033395568 -02 34 15.788701740   8.41 8.39   8.400 B9.5III 28 0
49 [W96] rJ053835-0231 TT* 05 38 35.4679746552 -02 31 51.698592264 17.174 15.48 14.19 13.37 12.55 K7.0 21 0
50 [W96] 4771-1097 LM* 05 38 35.8728104976 -02 30 43.337476944 16.679 15.13 13.94 13.18 12.41 K6e 24 0
51 V* TY Ori Or* 05 38 35.8761712272 -02 43 51.225431052 16.39 15.25 13.88 13.08 12.32 K3.0 26 0
52 HD 294271 Y*O 05 38 36.5498973360 -02 33 12.757741200   7.78 7.88   7.990 B5V 33 0
53 2MASS J05383687-0236432 Y*O 05 38 36.8794609584 -02 36 43.316502912   19.36 18.18 16.76 14.89 M4.5 14 0
54 [W96] rJ053838-0236 LM* 05 38 38.2273375656 -02 36 38.502644580 17.054 15.35 14.09 13.25 12.38 K8e 23 0
55 [W96] 4771-1147 Y*O 05 38 38.4905614800 -02 34 55.095652092 15.117 13.49 12.35 11.73 10.97 K2.0 23 0
56 2MASS J05383888-0228016 Y*O 05 38 38.8901286864 -02 28 01.718651352 20.95 21.83   18.77 16.99 M5Ve 24 0
57 [BZR99] S Ori 68 BD* 05 38 39.1 -02 28 05         23.77 L5: 24 1
58 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 11 0
59 Haro 5-13 TT* 05 38 40.2734966736 -02 30 18.558554472 17.937 16.91 15.49 14.48 13.46 M0e 29 0
60 DENIS J053841.2-023737 * 05 38 41.2343533488 -02 37 37.751237472         17.55 ~ 11 1
61 UCAC2 30800097 TT* 05 38 41.2928547432 -02 37 22.626301404 16.93 15.86 14.54 14.192 12.78 M0.0 24 0
62 [BNM2013] 92.01 23 LM* 05 38 41.3591638344 -02 36 44.554940316   17.76   15.86 14.45 M2.0 14 0
63 2MASS J05384146-0235523 LM* 05 38 41.462 -02 35 52.31       18.57 16.15 ~ 9 0
64 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 557 0
65 2MASS J05384227-0237147 TT* 05 38 42.2801182536 -02 37 14.821687344 17.36 16.69 15.27 14.27 13.22 M0.5 27 0
66 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 15 0
67 [BNM2013] 90.02 74 LM* 05 38 43.3370878176 -02 32 00.861114372 21.747 18.95 17.31 15.90 14.06 M5.0 13 0
68 [FPS2006] NX 77 X 05 38 43.5 -02 34 50           ~ 3 0
69 [W96] rJ053843-0233 LM* 05 38 43.5573033864 -02 33 25.441109640 17.743 16.52 15.14 14.16 13.07 M1 19 0
70 2MASS J05384386-0237068 TT* 05 38 43.8691779528 -02 37 06.911503896 13.559   17.93 16.59 14.80 ~ 27 0
71 * sig Ori C Y*? 05 38 44.1189397296 -02 36 06.310060884   8.77 8.79   9.63 A2Vn 29 0
72 [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 29 0
73 2MASS J05384424-0232336 Y*O 05 38 44.2435528320 -02 32 33.699347484 16.18 15.21 13.89 13.01 12.13 K7.0 17 0
74 2MASS J05384449-0240305 Y*O 05 38 44.4967508136 -02 40 30.571322556 20.10 19.26 17.75 16.51 14.91 ~ 16 0
75 * 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) 791 0
76 NAME sig Ori IRS 1 * 05 38 44.9 -02 35 57           ~ 15 0
77 Mayrit 21023 * 05 38 45.3035699832 -02 35 41.253591372         14.7 ~ 7 0
78 V* V595 Ori Or* 05 38 45.37536 -02 41 59.4240 17.75 17.08 15.61 15.19 13.45 M1.5 24 0
79 * sig Ori D Y*O 05 38 45.6253355112 -02 35 58.894678824 5.7 6.51 6.69   6.98 B2V 59 0
80 2MASS J05384597-0245231 Y*O 05 38 45.9788793504 -02 45 23.198069628   20.35 19.04   15.69 M5.0 13 0
81 [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 17 0
82 * 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 451 0
83 UCAC4 438-011202 TT* 05 38 47.4634997136 -02 35 25.322448264 12.01 14.96 14.82 15.071 13.10 M0.5 20 0
84 [BZR99] S Ori 6 Y*O 05 38 47.6632499544 -02 30 37.481740308 20.977 20.25   17.30 15.38 ~ 19 0
85 [W96] rJ053847-0237 TT* 05 38 47.91648 -02 37 19.2360 16.81 16.78 15.51 15.01 13.39 M1.0 24 0
86 [W96] 4771-899 TT* 05 38 48.0364463496 -02 27 14.149731420 16.327 14.47 13.21 12.41 11.54 K7e 26 0
87 2MASS J05384828-0236409 Y*O 05 38 48.2919091608 -02 36 41.075987652 14.930 17.29   15.60 13.89 M4.5 14 0
88 [BNM2013] 90.02 90 LM* 05 38 48.6872974992 -02 36 16.297363080 13.474   15.45 14.24 13.37 M1.5 16 0
89 [W96] rJ053849-0238 LM* 05 38 49.1743174560 -02 38 22.302143052 17.35 16.22 14.87 13.93 12.91 M0.5e 21 0
90 [BNM2013] 93.03 5 LM* 05 38 49.2233239032 -02 41 25.201346748     15.98 14.73 13.23 M3.5 19 0
91 2MASS J05384970-0234526 Y*O 05 38 49.7044756272 -02 34 52.679689680   19.12 17.96 16.84 14.79 ~ 18 0
92 [BNM2013] 93.03 2 LM* 05 38 49.9362109848 -02 41 22.889892552 19.21 18.27 16.76 15.59 14.16 M3.0 19 0
93 2MASS J05385003-0237354 Y*O 05 38 50.0383707336 -02 37 35.548478076 19.47 18.95 18.00 16.69 14.93 ~ 18 0
94 [BNM2013] 92.01 11 LM* 05 38 50.3806143456 -02 26 47.716947420 19.775 18.37 16.79 15.56 14.05 M3.5 16 0
95 [BNM2013] 90.02 362 LM* 05 38 50.7819191472 -02 36 26.805329712 18.816 18.76   16.98 15.12 M3.0 16 0
96 [KJN2005] 1.02 156 LM* 05 38 51.0114916824 -02 27 45.664092612   19.3 18.3 16.51 15.51 K6.0 6 0
97 [BNM2013] 90.02 91 LM* 05 38 51.4560020472 -02 36 20.641613616 16.090 18.23 17.47 16.09 14.38 K5V 16 0
98 [BNM2013] 90.02 293 LM* 05 38 51.7468872456 -02 36 03.425317272 15.494 19.63 17.89 16.84 15.04 ~ 14 0
99 V* RU Ori TT* 05 38 52.0091406720 -02 46 43.719992436     14.27 13.44 12.72 K7.5 33 0
100 [W96] rJ053852-0238 LM* 05 38 53.0748520464 -02 38 53.714969592 17.35 16.30 14.82 13.83 12.75 M1.0 11 0
101 Mayrit 489165 LM* 05 38 53.180280 -02 43 52.99500 18.36 17.19 15.62 15.27 13.68 M1.0 15 0
102 [W96] 4771-1049 Y*O 05 38 53.3786496600 -02 33 23.078055204 15.736 14.21 13.05 12.30 11.59 K3 14 0
103 [W96] 4771-119 TT* 05 38 54.1062760704 -02 49 29.807244084     13.31   11.95 K3(e) 22 0
104 2MASS J05385492-0228583 Y*O 05 38 54.9292657368 -02 28 58.375755156 21.05 20.21 18.61 17.22 15.48 M4.5 31 0
105 [FPS2006] NX 114 X 05 38 56.99 -02 31 25.6           ~ 1 0
106 NVSS J053859-023409 Rad 05 38 58.9767860 -02 34 13.713765           ~ 5 0
107 [SSC2008] 39 X 05 38 59.03 -02 34 13.2           ~ 2 0
108 Mayrit 707162 Y*O 05 38 59.109048 -02 47 13.38720   16.08 14.22 15.38 12.561 M2.0 18 0
109 [BZR99] S Ori 72 * 05 38 59.17 -02 35 26.0           ~ 4 0
110 Haro 5-18 Y*O 05 38 59.2270703712 -02 33 51.416508384 18.648 17.62 16.55 15.59 14.43 M2.5 26 0
111 2MASS J05385930-0235282 NIR 05 38 59.3022204792 -02 35 28.666497192           ~ 3 0
112 [SSC2008] 40 X 05 38 59.51 -02 35 28.6           ~ 2 0
113 2MASS J05385955-0245080 Y*O 05 38 59.5592540088 -02 45 08.197736328     12.520 12.08 11.69 F4.5 11 0
114 [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 7 0
115 2MASS J05390115-0236388 Y*O 05 39 01.1575458936 -02 36 38.885743908 19.061 19.45 18.04 16.70 15.11 ~ 16 0
116 HD 37525 Y*O 05 39 01.4927799048 -02 38 56.364214344   7.98 8.06   8.210 B5V 80 1
117 [W96] rJ053901-0240 * 05 39 01.6 -02 40 57           ~ 1 0
118 [BNM2013] 90.02 66 LM* 05 39 02.7719014080 -02 29 55.865251140 19.981 18.56 16.98 15.76 14.21 M4.0 22 0
119 2MASS J05390524-0233005 Y*O 05 39 05.2462706112 -02 33 00.594522684 20.41 19.36 17.89 16.58 14.97 ~ 16 0
120 [W96] 4771-1075 TT* 05 39 05.4085005984 -02 32 30.366192804 17.541 15.79 14.42 13.54 12.70 K7e 35 0
121 [W96] rJ053907-0228 LM* 05 39 07.5918979680 -02 28 23.408982264 19.14 18.52 16.98 15.79 14.36 M3e 23 0
122 Haro 5-19 Or* 05 39 07.6049425848 -02 32 39.192952344 16.743 15.24 13.99 13.18 12.41 K6.5 27 0
123 [BZR99] S Ori 25 Or* 05 39 08.9497481544 -02 39 57.986417520     21.09 19.34 17.02 M6.5V 23 0
124 Haro 5-20 Or* 05 39 11.5179186744 -02 31 06.580001460 18.295 16.98 15.45 14.56 13.56 M0.0 31 0
125 [W96] 4771-1038 LM* 05 39 11.6324490456 -02 36 02.883889440 16.242 15.82 14.47 13.61 12.75 K7e 24 0
126 2MASS J05391232-0230064 Y*O 05 39 12.3264257688 -02 30 06.489568440   19.70 18.17 16.57 14.63 M5.0 15 0
127 2MASS J05391346-0237391 Y*O 05 39 13.4673270624 -02 37 39.157408020   19.95 18.33 16.88 15.13 M4.0 11 0
128 [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 17 0
129 HD 37564 Y*O 05 39 15.0592783536 -02 31 37.638414516   8.67 8.43   8.180 A8V 39 0
130 [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 19 0
131 [W96] rJ053916-0233 * 05 39 16.8 -02 33 03           ~ 1 0
132 2MASS J05391699-0241171 Y*O 05 39 17.0054002728 -02 41 17.198587896 20.56 20.51 18.86 17.52 15.92 ~ 9 0
133 Kiso A-0904 80 Y*O 05 39 17.176752 -02 25 43.36716 19.748 18.25 16.40 16.02 14.18 M1.5 19 0
134 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 18 0
135 Haro 5-21 TT* 05 39 18.8360108640 -02 30 53.221941684 17.563 15.88 14.41 13.49 12.60 K7.0 28 0
136 [BNM2013] 90.02 55 LM* 05 39 20.4494141808 -02 27 36.860094396 18.900 17.43 15.93 14.81 13.52 M2e 18 0
137 [BZR99] S Ori 3 LM* 05 39 20.9751873360 -02 30 33.534650772   20.66 19.25 17.58 15.57 ~ 19 0
138 [W96] rJ053923-0233 LM* 05 39 22.8701215704 -02 33 33.120077976 19.264 18.19 16.56 15.47 14.19 M2e 22 0
139 [BNM2013] 90.02 83 LM* 05 39 24.3620556120 -02 34 01.413666480 19.394 18.19 16.62 15.53 14.28 M2.0 17 0
140 2MASS J05392456-0220441 Y*O 05 39 24.5653037592 -02 20 44.147260356     13.93     K6.0 15 0
141 V* BG Ori TT* 05 39 25.2030748440 -02 38 22.059069252   15.88 14.72 13.78 12.83 K7.5 36 0
142 2MASS J05392647-0226154 Y*O 05 39 26.4735626208 -02 26 15.515569860   18.55 17.08 15.98 14.81 M1.5 13 0
143 2MASS J05393056-0238270 LM* 05 39 30.5686422432 -02 38 27.050390520   19.36 17.82 16.61 15.21 M2.5 10 0
144 2MASS J05393256-0239440 Y*O 05 39 32.5740847344 -02 39 44.034178500     13.64 13.07 12.38 K7.0 18 0
145 2MASS J05393378-0220398 Y*O 05 39 33.7864077936 -02 20 39.889265784   17.19 15.74 14.73 13.64 M1.0 14 0
146 HD 294300 TT* 05 39 36.5371112376 -02 42 17.225796096   10.91 10.11   9.230 G5e 26 0
147 2E 0537.0-0228 X 05 39 36.8 -02 26 56           ~ 1 0
148 2MASS J05393729-0226567 Y*O 05 39 37.2966577008 -02 26 56.803946928 17.790 16.25 14.84 13.89 12.98 M0 15 0
149 V* V603 Ori Or* 05 39 39.8292920832 -02 33 16.040160936 19.253   16.70   13.91 ~ 32 0
150 V* RW Ori Or* 05 39 39.9869752104 -02 43 09.749888724     13.32   11.956 K1.0 26 0
151 HD 37633 a2* 05 39 46.1985525288 -02 40 32.112574536   9.07 8.99   8.940 B9.5IIIpSi 57 0
152 2MASS J05394741-0226162 Y*O 05 39 47.4181583232 -02 26 16.311591456   12.74 11.83 11.77 10.962 K0 11 0
153 2MASS J05394784-0232248 Y*O 05 39 47.8356697848 -02 32 24.946773792     13.75   12.256 M0.0 14 0
154 HD 37699 Y*O 05 40 20.1907288344 -02 26 08.229954660   7.50 7.62   7.770 B5III 52 0
155 * zet Ori ** 05 40 45.52666 -01 56 33.2649 0.50 1.56 1.77 1.85 2.05 O9.7Ib+B0III 351 0
156 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 504 0
157 NGC 2264 OpC 06 40 52.1 +09 52 37           ~ 1760 0
158 NAME SO120731 * 08 38.5 -02 23           ~ 2 0
159 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1589 0
160 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 915 0
161 NAME Ori Belt reg ~ ~           ~ 78 0
162 [FPS2006] NX 14 X ~ ~           ~ 2 0
163 Mayrit 72345 * ~ ~           ~ 2 0

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2023.09.24-13:14:12

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