2005A&A...437..247D


Query : 2005A&A...437..247D

2005A&A...437..247D - Astronomy and Astrophysics, volume 437, 247-255 (2005/7-1)

The origin of massive O-type field stars. II. Field O stars as runaways.

DE WIT W.J., TESTI L., PALLA F. and ZINNECKER H.

Abstract (from CDS):

In two papers we try to confirm that all Galactic high-mass stars are formed in a cluster environment, by excluding that O-type stars found in the Galactic field actually formed there. In de Wit et al. (2004A&A...425..937D) we presented deep K-band imaging of 5arcmin fields centred on 43 massive O-type field stars that revealed that the large majority of these objects are single objects. In this contribution we explore the possibility that the field O stars are dynamically ejected from young clusters, by investigating their peculiar space velocity distribution, their distance from the Galactic plane, and their spatial vicinity to known young stellar clusters. We (re-)identify 22 field O-type stars as candidate runaway OB-stars. The statistics show that 4±2% of all O-type stars with V<8m can be considered as formed outside a cluster environment. Most are spectroscopically single objects, some are visual binaries. The derived percentage for O-type stars that form isolated in the field based on our statistical analyses is in agreement with what is expected from calculations adopting a universal cluster richness distribution with power index of β=1.7, assuming that the cluster richness distribution is continuous down to the smallest clusters containing one single star.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: formation - Galaxy: stellar content - stars: kinematics

Simbad objects: 58

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Number of rows : 58
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 V* AO Cas SB* 00 17 43.0633133256 +51 25 59.116450728 5.04 6.01 6.14     O9.2II+O8V((f)) 323 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10535 1
3 HD 15137 SB* 02 27 59.8113542520 +52 32 57.589857672 7 7.92 7.86     O9.5II-IIIn 123 0
4 HD 36879 * 05 35 40.5264730272 +21 24 11.719601856 6.97 7.69 7.58     O7V(n)((f))z 137 0
5 HD 39680 Be* 05 54 44.7315378936 +13 51 17.064365364 7.05 8.01 7.99     O6V:[n]pevar 119 0
6 HD 41161 * 06 05 52.4562749544 +48 14 57.417890532 5.66 6.658 6.764     O8Vn 124 0
7 HD 48279 ** 06 42 40.54719 +01 42 58.2571 7.26 8.03 7.86     O8V+F2V 145 0
8 HD 52266 SB* 07 00 21.0763468632 -05 49 35.954203044 6.32 7.22 7.23     O9.5IIIn 111 0
9 HD 52533 SB* 07 01 27.0486333888 -03 07 03.286283952 6.66 7.57 7.68     O8.5IVn 112 0
10 HD 57682 * 07 22 02.0546074728 -08 58 45.766323408 5.20 6.24 6.43     O9.2IV 246 0
11 HD 60848 Be* 07 37 05.7325392528 +16 54 15.300327852 5.55 6.67 6.87     O8:V:pe 136 0
12 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1139 1
13 HD 75222 s*b 08 47 25.1378783304 -36 45 02.670440616 7.24 7.80 7.42 8.22   O9.7Iab 87 0
14 HD 89137 * 10 15 40.0854126480 -51 15 24.093239544 7.02 7.93 7.97 8.82   ON9.7II(n) 91 1
15 HD 91452 * 10 31 50.5952642688 -63 56 25.690580484 7 8.83 8.60 8.35   B0III 57 1
16 HD 96917 V* 11 08 42.6179945208 -57 03 56.913146676 6.46 7.29 7.21 7.04 6.89 O8Ib(n)(f) 103 0
17 HD 105627 * 12 09 44.5819662312 -62 34 54.626272356 7.31 8.21 8.19 9.05   O9III 77 0
18 HD 112244 s*b 12 55 57.1336250856 -56 50 08.900570292 4.49 5.33 5.32 5.21 5.21 O8.5Iab(f)p 203 0
19 Ass Cen OB 1 As* 13 02 -61.4           ~ 106 0
20 HD 113658 * 13 06 17.8297672368 -61 08 35.066306184   9.93 9.84     B9III 15 0
21 V* V961 Cen SB* 13 16 04.8010592232 -62 35 01.490795556 7.51 9.16 9.32 8.82   O9.5III+B0Ib 101 1
22 Cl Stock 16 OpC 13 19 26 -62 37.3           ~ 89 0
23 GUM 48a HII 13 19 46 -62 30.7           ~ 29 1
24 HD 117856 * 13 34 43.4076221487 -63 20 07.617046801 6.92 7.57 7.44     O9.7II-III 49 0
25 HD 120678 Em* 13 52 56.4133904568 -62 43 14.260321632 7.04 9.45 8.20 9.02   O9.5Ve 70 1
26 HD 122879 V* 14 06 25.1578487688 -59 42 57.254187024 5.90 6.64 6.50 6.33 6.18 B0Ia 166 1
27 HD 123056 SB* 14 07 25.6396562448 -60 28 14.155719348 7.54 8.28 8.14 9.00   O9.5IV(n) 59 0
28 HD 124314 ** 14 15 01.60615 -61 42 24.3831   8.96 6.64 6.45 6.31 O6V(n)((f)) 141 1
29 HD 125206 * 14 20 09.0397470528 -61 04 54.621382980 7.47 8.18 7.92 8.89   O9.7IVn 64 1
30 NGC 5606 OpC 14 27 47 -59 37.9           ~ 102 0
31 Cl Pismis 20 OpC 15 15 24 -59 04.4   8.69 7.8     ~ 98 0
32 * del Cir SB* 15 16 56.8959099600 -60 57 26.120078136 4.11 5.03 5.09 6.68   O8V 154 0
33 HD 135591 * 15 18 49.1432685384 -60 29 46.795963020 4.46 5.36 5.46 6.91   O8IV((f)) 155 0
34 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 210 0
35 HD 153426 * 17 01 13.0078001616 -38 12 11.886304536 6.79 7.61 7.47 8.49   O8.5III 94 0
36 HD 153919 HXB 17 03 56.7725629224 -37 50 38.913331452 6.06 6.78 6.51 6.08 5.90 O6Iafcp 793 1
37 HD 154368 s*b 17 06 28.3687759224 -35 27 03.760593156 6.10 6.63 6.13 7.12   O9.5Iab 281 0
38 HD 154643 SB* 17 08 13.9817547216 -35 00 15.671611152 6.76 7.42 7.20 8.23   O9.7III 51 1
39 HD 154811 * 17 09 53.0865607752 -47 01 53.186262060 6.71 7.32 6.98 7.71   OC9.7Ib 82 0
40 Cl Bochum 13 OpC 17 17 20 -35 31.7   7.84 7.2     ~ 61 0
41 V* V1081 Sco EB* 17 29 12.9252525072 -31 32 03.427372140 6.22 7.07 7.04 7.93   O9.5V(n) 86 0
42 NGC 6383 OpC 17 34 42 -32 34.4           ~ 155 0
43 HD 159176 SB* 17 34 42.4921337376 -32 34 53.995451196 4.88 5.74 5.70 7.19   O7V((f))+O7V((f)) 248 0
44 Cl Collinder 347 OpC 17 46 23 -29 19.5   9.42 8.8     ~ 32 0
45 HD 161853 ** 17 49 16.5582018192 -31 15 18.068754204 7.48 8.11 7.97 8.81   O8V(n)z+B 73 2
46 HD 163758 s*b 17 59 28.3669369416 -36 01 15.589420824 6.46 7.35 7.32 8.38   O6.5Iafp 151 0
47 HD 165319 * 18 05 58.8359515224 -14 11 52.998222768 8.15 8.63 8.04 7.50 7.00 O9.7Ib 71 1
48 Ass Sgr OB 1 As* 18 06 -22.8           ~ 123 0
49 NGC 6604 OpC 18 18 03 -12 14.5           ~ 133 0
50 V* RY Sct Be* 18 25 31.4771300232 -12 41 24.192361500 10.25 10.38 9.12 9.46   O9.7Ibep 296 2
51 EM* MWC 297 Ae* 18 27 39.5265500160 -03 49 52.133050776 15.57 14.34 12.31 11.34   B1.5Ve 286 0
52 HD 175754 Em* 18 57 35.7085336776 -19 09 11.264191704 5.99 6.96 7.03     O8II(n)((f))p 143 0
53 HD 175876 * 18 58 10.7660947512 -20 25 25.541961636 5.79 6.82 6.94 6.93   O6.5III(n)(f) 145 0
54 HD 188209 s*b 19 51 59.0687638680 +47 01 38.419078944 4.61 5.55 5.63 5.54 5.64 O9.5Iab 301 0
55 HD 193793 WR* 20 20 27.9757908696 +43 51 16.286840244 6.90 7.25 6.85 4.58   WC7pd+O5.5fc 683 1
56 HD 195592 s*b 20 30 34.9690901208 +44 18 54.859533372 7.75 7.95 7.08 6.29 5.60 O9.7Ia 205 1
57 HD 201345 * 21 07 55.4150161776 +33 23 49.228548972   7.611 7.764     ON9.2IV 165 0
58 HD 202124 s*b 21 12 28.3896178416 +44 31 54.129118980 7.33 7.94 7.76     O9Iab 94 0

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2023.02.01-19:56:26

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