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


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET06:17:34

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 - 2020
#notes
1 V* AO Cas WU* 00 17 43.0629024684 +51 25 59.115602831 5.04 6.01 6.14     O9.2II+O8V((f)) 316 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9107 1
3 HD 15137 SB* 02 27 59.8115835376 +52 32 57.594553098 7 7.92 7.86     O9.5II-IIIn 113 0
4 HD 36879 * 05 35 40.5264637356 +21 24 11.723003025 6.97 7.69 7.58     O7V(n)((f))z 130 0
5 HD 39680 Be* 05 54 44.7314236108 +13 51 17.068152340 7.05 8.01 7.99     O6V:[n]pevar 111 0
6 HD 41161 * 06 05 52.4560396927 +48 14 57.426040975 5.66 6.658 6.764     O8Vn 118 0
7 HD 48279 ** 06 42 40.54719 +01 42 58.2571 7.26 8.03 7.86     O8V+F2V 137 0
8 HD 52266 SB* 07 00 21.0761535622 -05 49 35.948161271 6.32 7.22 7.23     O9.5IIIn 105 0
9 HD 52533 SB* 07 01 27.0485530401 -03 07 03.281136257 6.66 7.57 7.68     O8.5IVn 102 0
10 HD 57682 * 07 22 02.0544956184 -08 58 45.761168747 5.20 6.24 6.43     O9.2IV 230 0
11 HD 60848 Be* 07 37 05.7328585099 +16 54 15.303398878 5.55 6.67 6.87     O8:V:pe 128 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 1083 1
13 HD 75222 s*b 08 47 25.1379208787 -36 45 02.670863732 7.24 7.80 7.42 8.22   O9.7Iab 83 0
14 HD 89137 * 10 15 40.0856062390 -51 15 24.090337747 7.02 7.93 7.97 8.82   ON9.7II(n) 82 1
15 HD 91452 * 10 31 50.5946606809 -63 56 25.689335931 7 8.83 8.60 8.35   B0III 54 1
16 HD 96917 V* 11 08 42.6177305611 -57 03 56.912915285 6.46 7.29 7.21 7.04 6.89 O8Ib(n)(f) 96 0
17 HD 105627 * 12 09 44.5816285147 -62 34 54.626419143 7.31 8.21 8.19 9.05   O9III 70 0
18 HD 112244 s*b 12 55 57.1346044550 -56 50 08.891958192 4.49 5.33 5.32 5.21 5.21 O8.5Iab(f)p 191 0
19 Ass Cen OB 1 As* 13 02 -61.4           ~ 101 0
20 HD 113658 * 13 06 17.8286949871 -61 08 35.057221262   9.93 9.84     B9III 13 0
21 V* V961 Cen SB* 13 16 04.8010733834 -62 35 01.487031096 7.51 9.16 9.32 8.82   O9.5III+B0Ib 91 1
22 Cl Stock 16 OpC 13 19 29 -62 38.0   9.64 9.1     ~ 80 0
23 GUM 48a HII 13 19 46 -62 30.7           ~ 27 1
24 HD 117856 * 13 34 43.40546 -63 20 07.6319 6.92 8.97 8.90 8.29   O9.7II-III 44 0
25 HD 120678 Em* 13 52 56.4133085414 -62 43 14.259143108 7.04 9.45 8.20 9.02   O9.5Ve 62 1
26 HD 122879 V* 14 06 25.1577457205 -59 42 57.253857893 5.90 6.64 6.50 6.33 6.18 B0Ia 155 1
27 HD 123056 * 14 07 25.6377162147 -60 28 14.148538108 7.54 8.28 8.14 9.00   O9.5IV(n) 53 0
28 HD 124314 ** 14 15 01.60615 -61 42 24.3831   8.96 6.64 6.45 6.31 O6V(n)((f)) 133 1
29 HD 125206 * 14 20 09.0397646122 -61 04 54.620330264 7.47 8.18 7.92 8.89   O9.7IVn 60 1
30 NGC 5606 OpC 14 27 47 -59 38.4   7.95 7.7     ~ 90 0
31 Cl Pismis 20 OpC 15 15 23 -59 04.0   8.69 7.8     ~ 84 0
32 * del Cir SB* 15 16 56.8969460249 -60 57 26.100998940 4.11 5.03 5.09 6.68   O8V 146 0
33 HD 135591 * 15 18 49.1429870266 -60 29 46.794326631 4.46 5.36 5.46 6.91   O8IV((f)) 144 0
34 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 188 0
35 HD 153426 * 17 01 13.0075706903 -38 12 11.888514524 6.79 7.61 7.47 8.49   O8.5III 85 0
36 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 745 1
37 HD 154368 s*b 17 06 28.3687923960 -35 27 03.759955171 6.10 6.63 6.13 7.12   O9.5Iab 260 0
38 HD 154643 * 17 08 13.9816706301 -35 00 15.670543148 6.76 7.42 7.20 8.23   O9.7III 44 1
39 HD 154811 * 17 09 53.0868663445 -47 01 53.192207532 6.71 7.32 6.98 7.71   OC9.7Ib 77 0
40 Cl Bochum 13 OpC 17 17 24 -35 33.0   7.84 7.2     ~ 48 0
41 V* V1081 Sco Al* 17 29 12.9251873752 -31 32 03.426713313 6.22 7.07 7.04 7.93   O9.5V(n) 81 0
42 HD 159176 SB* 17 34 42.4926595872 -32 34 53.964439199 4.88 5.74 5.70 7.19   O7V((f))+O7V((f)) 239 0
43 NGC 6383 OpC 17 34 48 -32 34.0   5.56 5.5     ~ 135 0
44 Cl Collinder 347 OpC 17 46 23 -29 19.5   9.42 8.8     ~ 28 0
45 HD 161853 ** 17 49 16.5580430858 -31 15 18.070335520 7.48 8.11 7.97 8.81   O8V(n)z+B 69 2
46 HD 163758 s*b 17 59 28.3670166132 -36 01 15.588119230 6.46 7.35 7.32 8.38   O6.5Iafp 144 0
47 HD 165319 * 18 05 58.8360539028 -14 11 52.998719141 8.15 8.63 8.04 7.50 7.00 O9.7Ib 68 1
48 Ass Sgr OB 1 As* 18 06 -22.8           ~ 111 0
49 NGC 6604 OpC 18 18 03 -12 14.5   7.06 6.5     ~ 116 1
50 V* RY Sct bL* 18 25 31.6335 -12 41 27.846 10.25 10.38 9.12 9.46   O9.7Ibep 283 2
51 EM* MWC 297 Ae* 18 27 39.5266257570 -03 49 52.136526892 15.57 14.34 12.31 11.34   B1.5Ve 260 0
52 HD 175754 Em* 18 57 35.7086008504 -19 09 11.269005090 5.99 6.96 7.03     O8II(n)((f))p 140 0
53 HD 175876 * 18 58 10.7660968929 -20 25 25.544115183 5.79 6.82 6.94 6.93   O6.5III(n)(f) 141 0
54 HD 188209 s*b 19 51 59.0685711923 +47 01 38.420250587 4.61 5.55 5.63 5.54 5.64 O9.5Iab 287 0
55 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 641 1
56 HD 195592 s*b 20 30 34.9690436039 +44 18 54.858025184 7.75 7.95 7.08 6.29 5.60 O9.7Ia 197 1
57 HD 201345 * 21 07 55.4153633777 +33 23 49.226678368   7.611 7.764     ON9.2IV 157 0
58 HD 202124 s*b 21 12 28.3896915394 +44 31 54.125407798 7.33 7.94 7.76     O9Iab 89 0

    Equat.    Gal    SGal    Ecl

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2019.11.18-06:17:34

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