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


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.24CEST23:04:33

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 in Simbad:  could be processed

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 - 2019
#notes
1 V* T Phe Mi* 00 30 26.2344686608 -46 24 33.373015476   12.46 11.43 12.43   M7e 61 0
2 RL 149 HS* 07 24 14.3741222640 -00 33 04.164965943 12.958 13.737 13.866 13.906 13.974 sdB 109 0
3 HD 64568 *iC 07 53 38.2052171216 -26 14 02.593344803 8.64 9.50 9.39 9.77 9.204 O3V((f*))z 86 0
4 NAME Car Arm PoG 10 00 -60.0           ~ 366 1
5 Cl* Westerlund 2 MSP 105 * 10 23 55.266 -57 45 09.17 19.349 19.128 17.488   15.384 ~ 5 0
6 Cl* Westerlund 2 MSP 182 *iC 10 23 56.176 -57 45 29.99 15.737 15.882 14.490 13.87 12.36 O4III 13 0
7 Cl* Westerlund 2 MSP 256 * 10 23 57.56 -57 45 55.3 21.498 20.665 18.972   16.611 ~ 5 0
8 V* V712 Car bL* 10 23 58.002 -57 45 48.99 15.452 15.461 13.5 12.6   O3If*/WN6+O3If*/WN6 144 1
9 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 261 0
10 Cl* Westerlund 2 MSP 176 * 10 23 58.30 -57 45 29.2 19.876 19.696 17.779   15.413 ~ 5 0
11 Cl* Westerlund 2 MSP 135 * 10 23 58.62 -57 45 18.5 20.713 20.256 18.843   16.551 ~ 5 0
12 [VKB2013] 362 * 10 23 58.9011454906 -57 45 27.005046948 19.788 19.718 18.008   15.977 ~ 5 0
13 Cl* Westerlund 2 MSP 231 * 10 23 58.96 -57 45 43.8 20.446 20.121 18.656   16.214 ~ 5 0
14 Cl* Westerlund 2 MSP 223 *iC 10 23 59.192 -57 45 40.27 17.592 17.472 16.019   13.33 O7-8 9 0
15 2MASS J10235955-5745225 Y*? 10 23 59.556 -57 45 22.54 14.96 14.05 13.030 12.74 11.806 G8III 4 0
16 Cl* Westerlund 2 MSP 225 * 10 23 59.63 -57 45 42.1     18.714   16.327 ~ 5 0
17 Cl* Westerlund 2 MSP 180 * 10 24 00.15 -57 45 29.8 20.157 19.536 18.089   15.592 ~ 5 0
18 Cl* Westerlund 2 MSP 44 *iC 10 24 00.495 -57 44 44.49 16.789 16.862 15.562 15.11 13.69 B1V+PMS 12 0
19 UCAC3 65-98348 PM* 10 24 00.51 -57 45 23.9 15.826 15.931 14.522 13.83 12.380 O4V 11 0
20 Cl* Westerlund 2 MSP 113 * 10 24 00.61 -57 45 11.4 20.754 20.143 18.807   16.412 ~ 5 0
21 2MASS J10240073-5745253 Y*? 10 24 00.736 -57 45 25.39   15.50 14.14     O6.5V 12 0
22 Cl* Westerlund 2 MSP 96 *iC 10 24 00.983 -57 45 05.37 17.300 17.365 16.086 15.85 14.06 B1:+B1: 9 0
23 Cl* Westerlund 2 MSP 188 *iC 10 24 01.258 -57 45 30.86   14.60 13.32     O3V+O5.5 11 0
24 Cl* Westerlund 2 MSP 175 *iC 10 24 01.39 -57 45 29.7 15.250 15.413 14.059   11.999 O4V 12 0
25 Cl* Westerlund 2 MSP 263 *iC 10 24 01.517 -57 45 56.98 16.876 16.628 15.060 14.31 12.54 O6V 11 0
26 Cl* Westerlund 2 MSP 190 *iC 10 24 01.87 -57 45 31.2 17.056 17.154 15.654   13.674 ~ 5 0
27 Cl* Westerlund 2 MSP 167 *iC 10 24 02.012 -57 45 27.98   15.48 14.19     O8V 13 0
28 [VKB2013] 798 * 10 24 02.04 -57 45 56.8 20.619 20.169 18.772   16.253 ~ 5 0
29 Cl Westerlund 2 3 Y*? 10 24 02.2316493320 -57 45 02.727471202 14.602 14.48 13.79   13.042 G0V 6 0
30 [VKB2013] 843 * 10 24 02.26 -57 45 35.1 16.055 16.137 14.713   12.514 O4-5V 7 0
31 Cl* Westerlund 2 NRM 4 *iC 10 24 02.302 -57 45 35.14   14.66 13.22     O6III 10 0
32 [VKB2013] 857 * 10 24 02.31 -57 45 35.5 15.179 15.279 13.869   11.785 O4.5V 8 0
33 Cl* Westerlund 2 MSP 183 *iC 10 24 02.376 -57 45 30.78 15.442 15.488 13.857     O3V(f) 11 0
34 Cl Westerlund 2 5 *iC 10 24 02.434 -57 44 35.98 14.235 14.439 13.129 12.2   O5/5.5V/III(f) 22 0
35 [VKB2013] 885 * 10 24 02.44 -57 45 42.2 19.823 19.476 18.202   15.777 ~ 5 0
36 [VKB2013] 886 * 10 24 02.4481864166 -57 46 35.225850957 20.745 20.478 18.868   16.266 ~ 5 0
37 Cl* Westerlund 2 MSP 199 *iC 10 24 02.65 -57 45 34.4 15.893 15.979 14.531   12.364 O3V 12 0
38 Cl* Westerlund 2 MSP 202 * 10 24 03.44 -57 45 35.0 20.002 19.780 17.870   15.678 ~ 5 0
39 Cl* Westerlund 2 MSP 137 * 10 24 03.80 -57 45 20.4 21.06 20.68 18.945   16.634 ~ 5 0
40 [VKB2013] 1009 * 10 24 03.9668525304 -57 45 55.323634617 21.663 22.785 18.952   16.567 ~ 5 0
41 Cl* Westerlund 2 MSP 83 *iC 10 24 04.5272460975 -57 45 00.689543499         16.60 ~ 4 0
42 Cl* Westerlund 2 MSP 171 *iC 10 24 04.892 -57 45 28.29 16.049 15.950 14.523 13.91 12.25 O5V 13 0
43 [VKB2013] 1050 * 10 24 05.8026582810 -57 45 28.490589154 20.378 19.662 18.036   15.824 ~ 5 0
44 Cl* Westerlund 2 MSP 218 * 10 24 07.6531803724 -57 45 40.669211919 14.61 14.40 14.01 14.37 13.62 A0III 5 0
45 GUM 29 HII 10 24 14.6 -57 46 58           ~ 187 0
46 WR 20b WR* 10 24 18.3972653285 -57 48 29.778301585     13.7 12.0   WN6ha 45 0
47 NGC 3603 HII 11 15 24 -61 15.0           ~ 911 2

    Equat.    Gal    SGal    Ecl

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2019.08.24-23:04:33

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