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

Query : 2007A&A...466..917C

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 - 2024 		#notes
1 NAME Barnard's Loop HII 05 27.5 -03 58           ~ 125 1
2 * del Ori SB* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 O9.5IINwk 779 0
3 NAME Ori Sword Cl* 05 35 10 -05 12.0           ~ 12 0
4 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
5 NAME Ori Complex Cld 05 35.3 -05 23           ~ 441 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 896 0
7 TYC 4770-1018-1 * 05 36 57.1523934576 -02 25 39.939802860   12.54 11.05     K0: 4 0
8 TYC 4770-1129-1 * 05 37 08.5007184840 -02 22 06.388907232   12.64 11.73     ~ 2 0
9 TYC 4770-1432-1 * 05 37 09.8609903736 -02 40 00.833258640   13.042 12.391 12.311   ~ 2 0
10 2MASS J05371049-0230070 Y*O 05 37 10.4911770480 -02 30 07.071120504   12.08 11.42   11.307 F7 8 0
11 HD 294270 SB* 05 37 18.8217155232 -02 31 36.437608812   11.41 10.85     G0 14 0
12 TYC 4770-924-1 * 05 37 19.2243150024 -02 28 46.218659880   13.14 12.28   11.36 ~ 9 0
13 HD 294276 PM* 05 37 20.6760809160 -02 49 33.129302592   11.03 10.34     G4 11 0
14 TYC 4770-1468-1 * 05 37 29.8814700216 -02 43 45.745046076   12.78 10.89     K1 12 0
15 HD 294275 Y*O 05 37 31.8728831184 -02 45 18.469551240   9.51 9.42   9.360 A1 23 0
16 HD 37333 Y*O 05 37 40.4746109712 -02 26 36.837308472   8.59 8.51   8.420 A1Va(Si) 49 0
17 2MASS J05374178-0229081 Y*O 05 37 41.7888512256 -02 29 08.189864916   11.20 10.90     A9.0 11 0
18 IRAS 05352-0227 FIR 05 37 43.4 -02 25 22           ~ 2 0
19 2MASS J05374491-0229573 Y*O 05 37 44.9166095784 -02 29 57.276996360   11.50 10.95   10.747 F7 15 1
20 HD 294274 Y*O 05 37 45.3615924336 -02 44 12.501367584   11.47 10.66     G2 13 0
21 TYC 4771-921-1 Y*O 05 37 54.4037119440 -02 39 29.792935836   11.80 10.91   10.274 G5.0 21 0
22 HD 294277 * 05 37 57.3423530688 -02 53 17.713269312   10.98 9.57     K3 7 0
23 HD 294269 SB* 05 37 57.8184793920 -02 26 33.561791664   11.40 10.74     ~ 22 0
24 TYC 4771-720-1 * 05 37 59.0407497768 -02 41 00.529853244   11.92 11.77     G6 9 0
25 NAME Ori I As* 05 38 -02.8           ~ 615 0
26 GSC 04771-00961 LM* 05 38 02.2128504096 -02 29 55.620958560 18.057 15.5 14.49 13.68 12.99 ~ 14 0
27 2MASS J05380649-0228494 Y*O 05 38 06.4951983744 -02 28 49.454544612 12.715 11.76 11.38   10.741 F3.5 17 0
28 HD 294268 Y*O 05 38 14.1178464312 -02 15 59.762656296   10.93 10.45   10.010 F6e 37 0
29 TYC 4771-873-1 * 05 38 14.4295721112 -02 19 58.784634912   12.85 12.30   11.62 F2 9 0
30 IRAS 05358-0238 Y*O 05 38 19.7595686496 -02 36 39.156892812 17.86 17.50 15.84 14.07 12.07 M6.0 18 0
31 HD 294273 Y*O 05 38 27.5257761480 -02 43 32.615288688   10.89 10.81   10.396 A8.0 22 0
32 HD 294280 * 05 38 28.4915353488 -03 03 33.810078240   11.33 9.66     K5 7 0
33 HD 294279 Y*O 05 38 31.3776436728 -02 55 03.198232380   11.03 10.60   10.229 F1 17 0
34 V* TX Ori TT* 05 38 33.6879729168 -02 44 14.166027204 13.75 13.16 12.06 11.38 10.73 K4.5 45 0
35 HD 294272B Y*O 05 38 34.2313042656 -02 34 16.026938112   8.55 8.57   8.570 B8V 24 0
36 EM* StHA 50 Em* 05 38 34.4425065024 -02 28 47.641026432   11.26 11.30   11.004 B6 14 0
37 HD 294272 ** 05 38 34.80 -02 34 15.8           B9.5III+B8V 16 0
38 HD 294272A Y*O 05 38 34.8033395568 -02 34 15.788701740   8.41 8.39   8.400 B9.5III 29 0
39 HD 294271 Y*O 05 38 36.5498973360 -02 33 12.757741200   7.78 7.88   7.990 B5V 34 0
40 HD 294278 * 05 38 38.7590646216 -02 49 01.368724728   11.07 9.80     K0 7 0
41 2MASS J05383888-0228016 Y*O 05 38 38.8901286864 -02 28 01.718651352 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 sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
44 * sig Ori C Y*? 05 38 44.1189397296 -02 36 06.310060884   8.77 8.79   9.63 A2Vn 29 0
45 * 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) 801 0
46 NAME sig Ori IRS 1 * 05 38 44.9 -02 35 57           ~ 15 0
47 * sig Ori D Y*O 05 38 45.6253355112 -02 35 58.894678824 5.7 6.51 6.69   6.98 B2V 59 0
48 * 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 458 0
49 HD 37525 Y*O 05 39 01.4927799048 -02 38 56.364214344   7.98 8.06   8.210 B5V 82 1
50 HD 37545 Y*O 05 39 09.2140998192 -02 56 34.720052640   9.29 9.29   9.320 B9V 29 0
51 TYC 4771-1012-1 * 05 39 13.9636402416 -02 10 49.212636492   12.55 11.09     K3 3 0
52 HD 37564 Y*O 05 39 15.0592783536 -02 31 37.638414516   8.67 8.43   8.180 A8V 40 0
53 TYC 4771-661-1 * 05 39 20.4634331544 -02 27 51.079758228 14.42 14.13 13.55 13.16 12.82 G2 8 0
54 HD 294300 TT* 05 39 36.5371112376 -02 42 17.225796096   10.91 10.11   9.230 G5e 27 0
55 Haro 5-27 TT* 05 39 39.8261592024 -02 31 21.865624536 14.589   14.30 13.92 13.073 K5.5 76 0
56 TYC 4771-934-1 * 05 39 43.0607685072 -02 28 45.693540336   12.749 11.423     K0 7 0
57 HD 37633 a2* 05 39 46.1985525288 -02 40 32.112574536   9.07 8.99   8.940 B9.5IIIpSi 61 0
58 HD 294298 Y*O 05 39 59.3066512752 -02 22 54.423171840   11.52 10.90   9.951 G2.0 26 0
59 HD 294307 * 05 40 12.4604899008 -02 52 57.656472600   10.99 10.49     F7 16 0
60 HD 37686 * 05 40 13.0895539944 -02 30 53.217797688   9.27 9.21   9.180 B9.5V 32 0
61 HD 37699 Y*O 05 40 20.1907288344 -02 26 08.229954660   7.50 7.62   7.770 B5III 54 0
62 HD 294301 * 05 40 21.1206527592 -02 40 25.613925672   11.49 11.09   10.568 F2 20 0
63 HD 294297 * 05 40 27.5432293608 -02 25 43.161205152   10.7 10.117 10.01 9.77 G2: 30 0
64 HD 37744 V* 05 40 37.2968503824 -02 49 30.852237396 5.14 6.02 6.22     B2IV 148 0
65 * zet Ori ** 05 40 45.52666 -01 56 33.2649 0.50 1.56 1.77 1.85 2.05 O9.7Ib+B0III 357 0
66 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 511 0
67 IC 434 HII 05 41 -02.5           ~ 89 1
68 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 703 1
69 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1154 1
70 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
71 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
72 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
73 NAME Ori Belt reg ~ ~           ~ 78 0

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