2007A&A...466..917C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST06:40:42

2007A&A...466..917C - Astronomy and Astrophysics, volume 466, 917-930 (2007/5-2)

The brightest stars of the σ Orionis cluster.

CABALLERO J.A.

Abstract (from CDS):

The very young σ Orionis cluster (∼3Ma) is a cornerstone in understanding the formation of stars and substellar objects down to planetary masses. However, its stellar population is far from being completely known. This study's purpose is to identify and characterise the most massive stars of σ Orionis to complement current and future deep searches for brown dwarfs and planetary-mass objects in the cluster. I have cross-correlated the sources in the Tycho and 2MASS catalogues in a region of 30arcmin radius with its centre in the O-type star σ Ori A. In this area, I studied the membership in the Ori OB 1b association of the brightest stars in the optical using astrometric, X-ray, and both infrared and optical photometric data from public catalogues, and spectroscopic data from the literature. A list of 26 young stars, four candidate young stars, and 16 probable foreground stars has arisen from the study. Seven young stars probably harbour discs (four are new). There is no mass dependence of the disc frequency in the cluster. I have derived the first mass spectrum for σ Orionis from 1.1 to 24M(α=+2.0+0.2–0.1; roughly Salpeter-like). I also provide additional proof of the existence of several spatially superimposed stellar populations in the direction of σ Orionis. Finally, the cluster may be closer and older than previously thought.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: σ Orionis - stars: general - planetary systems: protoplanetary discs - astronomical data bases: miscellaneous

VizieR on-line data: <Available at CDS (J/A+A/466/917): table1.dat table2.dat>

Simbad objects: 73

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Number of rows : 73

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Barnard's Loop HII 05 27.5 -03 58           ~ 104 1
2 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 742 0
3 NAME Ori Sword Cl* 05 35 10 -05 12.0           ~ 12 0
4 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1466 1
5 NAME Ori Complex Cld 05 35.3 -05 23           ~ 334 0
6 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 856 0
7 TYC 4770-1018-1 * 05 36 57.1521519465 -02 25 39.939735942   12.54 11.05     ~ 4 0
8 TYC 4770-1129-1 * 05 37 08.5005706390 -02 22 06.386078918   12.64 11.73     ~ 2 0
9 TYC 4770-1432-1 * 05 37 09.689 -02 39 59.87   12.72 12.29     ~ 2 0
10 TYC 4770-1261-1 * 05 37 10.4910557007 -02 30 07.071066091   12.08 11.42   11.307 ~ 6 0
11 HD 294270 * 05 37 18.8218112275 -02 31 36.437230852   11.41 10.85     G0 10 0
12 TYC 4770-924-1 * 05 37 19.2243988998 -02 28 46.221233896   13.14 12.28   11.36 ~ 6 0
13 HD 294276 PM* 05 37 20.6761336049 -02 49 33.126216748   11.03 10.34     G0 7 0
14 TYC 4770-1468-1 * 05 37 29.8814630273 -02 43 45.743680622   12.78 10.89     ~ 6 0
15 HD 294275 Y*O 05 37 31.8728312238 -02 45 18.465113643   9.51 9.42   9.360 A0 18 0
16 HD 37333 Y*O 05 37 40.4746928699 -02 26 36.841198403   8.59 8.51   8.420 A1Va(Si) 38 0
17 2MASS J05374178-0229081 Y*O 05 37 41.7890797356 -02 29 08.189579350   11.20 10.90     A9.0 6 0
18 IRAS 05352-0227 FIR 05 37 43.4 -02 25 22           ~ 2 0
19 2MASS J05374491-0229573 Y*O 05 37 44.9162940937 -02 29 57.309866006   11.50 10.95   10.747 ~ 11 1
20 HD 294274 Y*O 05 37 45.3616513371 -02 44 12.500652359   11.47 10.66     G0 8 0
21 [W96] rJ053754-0239 Y*O 05 37 54.4032171635 -02 39 29.792561856   11.80 10.91   10.274 G5.0 16 0
22 HD 294277 * 05 37 57.3423676276 -02 53 17.710757506   10.98 9.57     K2 5 0
23 HD 294269 * 05 37 57.8190353196 -02 26 33.567435691   11.40 10.74     ~ 18 0
24 TYC 4771-720-1 * 05 37 59.0407736090 -02 41 00.528531881   11.92 11.77     ~ 5 0
25 NAME Ori I As* 05 38 -02.8           ~ 558 0
26 GSC 04771-00961 LM* 05 38 02.2128251071 -02 29 55.621571411 18.057 15.5 14.49 13.68 12.99 ~ 8 0
27 2MASS J05380649-0228494 Y*O 05 38 06.4952505522 -02 28 49.456255371 12.715 11.76 11.38   10.741 F3.5 13 0
28 HD 294268 Y*O 05 38 14.1177550239 -02 15 59.758632408   10.93 10.45   10.010 F6e 24 0
29 NAME SO120532 * 05 38 14.4295103519 -02 19 58.783809124   12.85 12.30   11.62 ~ 5 0
30 IRAS 05358-0238 Y*O 05 38 19.7597566344 -02 36 39.136465857 17.86 17.50 15.84 14.07 12.07 M6.0 13 0
31 HD 294273 Y*O 05 38 27.5258770749 -02 43 32.612876866   10.89 10.81   10.396 A8.0 15 0
32 HD 294280 * 05 38 28.4915625072 -03 03 33.809496320   11.33 9.66     K5 5 0
33 HD 294279 Y*O 05 38 31.3778779924 -02 55 03.197213896   11.03 10.60   10.229 A5 11 0
34 V* TX Ori Or* 05 38 33.6903234807 -02 44 14.132513585 13.75 13.16 12.06 11.38 10.73 K4.5 33 0
35 HD 294272B Y*O 05 38 34.2308665376 -02 34 16.020997132   8.55 8.57   8.570 B8V 16 0
36 EM* StHA 50 Em* 05 38 34.4424906028 -02 28 47.637591927   11.26 11.30   11.004 Be 10 0
37 HD 294272 ** 05 38 34.80 -02 34 15.8           B9.5III+B8V 15 0
38 HD 294272A Y*O 05 38 34.8033098687 -02 34 15.784459751   8.41 8.39   8.400 B9.5III 20 0
39 HD 294271 Y*O 05 38 36.5500037509 -02 33 12.757877962   7.78 7.88   7.990 B5V 25 0
40 HD 294278 * 05 38 38.7590464630 -02 49 01.368015329   11.07 9.80     K2 5 0
41 2MASS J05383888-0228016 Y*O 05 38 38.8911596595 -02 28 01.731339488 20.95 21.83   18.77 16.99 M5Ve 24 0
42 [BZR99] S Ori 68 BD* 05 38 39.1 -02 28 05         23.77 L5: 24 1
43 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 486 0
44 * sig Ori C Y*? 05 38 44.1192385581 -02 36 06.309707031   8.77 8.79   9.63 A2Vn 26 0
45 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 738 0
46 NAME sig Ori IRS 1 * 05 38 44.9 -02 35 57           ~ 15 0
47 * sig Ori D Y*O 05 38 45.6255496741 -02 35 58.888435332 5.7 6.51 6.69   6.98 B2V 47 0
48 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 400 0
49 HD 37525 Y*O 05 39 01.4929145441 -02 38 56.359361948   7.98 8.06   8.210 B5V 63 1
50 HD 37545 Y*O 05 39 09.2141662215 -02 56 34.714915707   9.29 9.29   9.320 B9V 23 0
51 TYC 4771-1012-1 * 05 39 13.9637204653 -02 10 49.211717935   12.55 11.09     ~ 3 0
52 HD 37564 Y*O 05 39 15.0589762669 -02 31 37.637357101   8.67 8.43   8.180 A8V 29 0
53 TYC 4771-661-1 * 05 39 20.4633889796 -02 27 51.079657942 14.42 14.13 13.55 13.16 12.82 ~ 5 0
54 HD 294300 TT* 05 39 36.5377766207 -02 42 17.190024467   10.91 10.11   9.230 G5e 18 0
55 Haro 5-27 Or* 05 39 39.8261219095 -02 31 21.866213622 14.589   14.30 13.92 13.073 K5.5 59 0
56 TYC 4771-934-1 * 05 39 43.0607153901 -02 28 45.691133314   12.749 11.423     ~ 3 0
57 HD 37633 a2* 05 39 46.1986412761 -02 40 32.114394169   9.07 8.99   8.940 B9.5IIIpSi 48 0
58 HD 294298 Ro* 05 39 59.3065824248 -02 22 54.423617714   11.52 10.90   9.951 G2.0 19 0
59 HD 294307 * 05 40 12.4607042447 -02 52 57.656345126   10.99 10.49     F8 11 0
60 HD 37686 * 05 40 13.0894729140 -02 30 53.215550382   9.27 9.21   9.180 B9.5V 27 0
61 HD 37699 Y*O 05 40 20.1906838846 -02 26 08.225704188   7.50 7.62   7.770 B5III 42 0
62 HD 294301 * 05 40 21.1206946283 -02 40 25.615614309   11.49 11.09   10.568 A5 14 0
63 HD 294297 * 05 40 27.5430927797 -02 25 43.159707809   10.7 10.117 10.01 9.77 ~ 23 0
64 HD 37744 V* 05 40 37.2961902857 -02 49 30.847246646 5.14 6.02 6.22     B2IV 135 0
65 * zet Ori ** 05 40 45.52666 -01 56 33.2649   1.59 1.79     O9.7Ib+B0III 329 0
66 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
67 IC 434 HII 05 41 -02.5           ~ 75 1
68 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 692 1
69 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1071 1
70 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 556 1
71 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
72 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
73 NAME Ori Belt reg ~ ~           ~ 65 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-06:40:42

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