2007A&A...463..981R


Query : 2007A&A...463..981R

2007A&A...463..981R - Astronomy and Astrophysics, volume 463, 981-991 (2007/3-1)

Early-type stars in the core of the young open cluster Westerlund 2.

RAUW G., MANFROID J., GOSSET E., NAZE Y., SANA H., DE BECKER M., FOELLMI C. and MOFFAT A.F.J.

Abstract (from CDS):

The properties of the early-type stars in the core of the Westerlund 2 cluster are examined in order to establish a link between the cluster and the very massive Wolf-Rayet binary WR 20a as well as the HII complex RCW49.Photometric monitoring as well as spectroscopic observations of Westerlund 2 are used to search for light variability and to establish the spectral types of the early-type stars in the cluster core.The first light curves of the eclipsing binary WR 20a in B and V filters are analysed and a distance of 8kpc is inferred. Three additional eclipsing binaries, which are probable late O or early B-type cluster members, are discovered, but none of the known early O-type stars in the cluster displays significant photometric variability above 1% at the 1-σ level. The twelve brightest O-type stars are found to have spectral types between O3 and O6.5, significantly earlier than previously thought.The distance of the early-type stars in Westerlund 2 is established to be in excellent agreement with the distance of WR 20a, indicating that WR 20a actually belongs to the cluster. Our best estimate of the cluster distance thus amounts to 8.0±1.4kpc. Despite the earlier spectral types, the currently known population of early-type stars in Westerlund 2 does not provide enough ionizing photons to account for the radio emission of the RCW49 complex. This suggests that there might still exist a number of embedded early O-stars in RCW49.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: individual: Westerlund 2 - stars: early-type - stars: binaries: eclipsing - stars: fundamental parameters - stars: individual: WR 20a

Nomenclature: Table 4: [RMG2007] JHHMMSS.s+DDMMSS.s N=1073.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 47

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Number of rows : 47
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* T Phe Mi* 00 30 26.2337742744 -46 24 33.379722396   12.46 11.43 12.43   M7e 68 0
2 RL 149 HS* 07 24 14.3741784768 -00 33 04.165016904 12.958 13.737 13.866 13.906 13.974 sdB 111 0
3 HD 64568 * 07 53 38.2051918848 -26 14 02.598056556 8.64 9.50 9.39 9.77 9.204 O3V((f*))z 103 0
4 NAME Car Arm PoG 10 00 -60.0           ~ 414 1
5 Cl* Westerlund 2 MSP 105 * 10 23 55.2576209016 -57 45 09.107207352 19.256 19.324 17.799   15.557 ~ 8 0
6 Cl* Westerlund 2 MSP 182 * 10 23 56.1791084352 -57 45 30.028596588 15.681 15.965 14.514 13.87 12.411 O4III 16 0
7 Cl* Westerlund 2 MSP 256 * 10 23 57.5587073136 -57 45 55.341784368 21.324 20.928 19.312   16.828 ~ 5 0
8 V* V712 Car EB* 10 23 58.0126366512 -57 45 48.937268268 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 158 1
9 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 316 0
10 Cl* Westerlund 2 MSP 176 * 10 23 58.2954010652 -57 45 29.203090589 19.876 20.084 18.197   15.688 ~ 7 0
11 Cl* Westerlund 2 MSP 135 * 10 23 58.6246330786 -57 45 18.566516777 20.595 20.489 18.836   16.596 ~ 7 0
12 Cl* Westerlund 2 MSP 164 * 10 23 58.9016504376 -57 45 27.008958204 19.788 19.923 18.340   16.117 ~ 8 0
13 Cl* Westerlund 2 MSP 231 * 10 23 58.9662892368 -57 45 43.867004364 20.539 20.382 18.639   16.235 ~ 5 0
14 Cl* Westerlund 2 MSP 223 * 10 23 59.192 -57 45 40.27 17.493 17.681 16.015   13.634 O7-8 9 0
15 2MASS J10235955-5745225 Y*? 10 23 59.5521134760 -57 45 22.546887048 15.174 14.452 13.030 12.74 11.800 G8III 6 0
16 Cl* Westerlund 2 MSP 225 * 10 23 59.6342702016 -57 45 42.151254408     18.829   16.327 ~ 8 0
17 Cl* Westerlund 2 MSP 180 * 10 24 00.1491420672 -57 45 29.799392868 20.047 19.798 18.069   15.607 ~ 9 0
18 Cl* Westerlund 2 MSP 151 * 10 24 00.4800478179 -57 45 23.965667265 15.792 16.031 14.546 13.83 12.414 O4V 14 0
19 Cl* Westerlund 2 MSP 44 * 10 24 00.4966924632 -57 44 44.501841888 16.761 16.945 15.587 15.11 13.826 B1V+PMS 15 0
20 Cl* Westerlund 2 MSP 113 * 10 24 00.6051556824 -57 45 11.362680108 20.688 20.355 18.804   16.652 ~ 8 0
21 Cl* Westerlund 2 MSP 157 Y*? 10 24 00.73608 -57 45 25.3908   15.50 14.14 13.009   O6.5V 12 0
22 Cl* Westerlund 2 MSP 96 * 10 24 00.9775872868 -57 45 05.467395389 17.275 17.447 16.111 15.85 14.06 B1:+B1: 11 0
23 Cl* Westerlund 2 MSP 188 * 10 24 01.258 -57 45 30.86   14.60 13.32     O3V+O5.5 11 0
24 Cl* Westerlund 2 MSP 175 * 10 24 01.3861781448 -57 45 29.615464584 15.188 15.495 14.084   12.045 O4V 13 0
25 Cl* Westerlund 2 MSP 263 * 10 24 01.5193116672 -57 45 57.009990168 16.791 16.863 15.053 14.31 12.582 O6V 13 0
26 Cl* Westerlund 2 MSP 190 * 10 24 01.8621936192 -57 45 31.217016456 17.190 17.392 15.953   13.877 ~ 6 0
27 Cl* Westerlund 2 MSP 262 * 10 24 02.0446626335 -57 45 56.784509219 20.459 20.429 18.748   16.268 ~ 7 0
28 Cl* Westerlund 2 MSP 167 * 10 24 02.0625463104 -57 45 27.966989664 16.001 16.117 14.453   12.121 O8V 18 0
29 Cl Westerlund 2 3 Y*? 10 24 02.2316112168 -57 45 02.725848504 14.534 14.616 13.887   13.081 G0V 6 0
30 [VKB2013] 843 * 10 24 02.26 -57 45 35.1 16.031 16.234 14.736   12.549 O4-5V 7 0
31 Cl* Westerlund 2 NRM 4 PM* 10 24 02.302 -57 45 35.14   14.66 13.22 12.47 10.81 O4.5V 10 0
32 [VKB2013] 857 * 10 24 02.31 -57 45 35.5 15.145 15.368 13.893   11.820 O4.5V 8 0
33 Cl* Westerlund 2 MSP 183 * 10 24 02.3591943528 -57 45 30.615139584 15.423 15.496 13.878     O3V(f) 14 0
34 [VKB2013] 885 * 10 24 02.44 -57 45 42.2 19.694 19.694 18.188   15.799 ~ 5 0
35 Cl Westerlund 2 5 * 10 24 02.4404730984 -57 44 36.147162768 14.149 14.514 13.155 12.2   O5/5.5V/III(f) 26 0
36 Cl* Westerlund 2 MSP 327 * 10 24 02.4485795184 -57 46 35.230443600 20.573 20.765 18.847   16.406 ~ 7 0
37 Cl* Westerlund 2 MSP 199 * 10 24 02.6483868216 -57 45 34.350515136 15.870 16.082 14.554   12.398 O3V 16 0
38 Cl* Westerlund 2 MSP 202 * 10 24 03.4450191432 -57 45 34.964274672 20.002 19.802 17.870   15.678 ~ 7 0
39 Cl* Westerlund 2 MSP 137 * 10 24 03.80 -57 45 20.4 21.06 20.68 19.139   16.634 ~ 5 0
40 Cl* Westerlund 2 MSP 254 * 10 24 03.9674549832 -57 45 55.323110664 21.663 22.785 19.280   16.567 ~ 7 0
41 Cl* Westerlund 2 MSP 83 * 10 24 04.5279505584 -57 45 00.684410328         16.60 ~ 7 0
42 Cl* Westerlund 2 MSP 171 * 10 24 04.8976113720 -57 45 28.395048240 15.975 16.134 14.528 13.91 12.307 O5V 16 0
43 Cl* Westerlund 2 MSP 170 * 10 24 05.8031414616 -57 45 28.489230252 20.289 19.893 18.036   15.824 ~ 6 0
44 Cl* Westerlund 2 MSP 218 * 10 24 07.6531403520 -57 45 40.668057828 14.510 14.551 14.235 14.37 13.695 A0III 5 0
45 GUM 29 HII 10 24 14.6 -57 46 58           ~ 199 0
46 WR 20b WR* 10 24 18.3978418584 -57 48 29.776921704     13.7 12.0   WN6ha 53 0
47 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1017 1

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2022.08.12-07:43:49

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