2002A&A...396L..25C

Query : 2002A&A...396L..25C

2002A&A...396L..25C - Astronomy and Astrophysics, volume 396L25-29 (2002/12-4)

A hidden population of Wolf-Rayet stars in the massive galactic cluster Westerlund 1.

CLARK J.S. and NEGUERUELA I.

Abstract (from CDS):

We report the discovery of a hitherto undetected population of Wolf-Rayet stars in the young galactic open cluster Westerlund 1. Optical spectroscopy of the cluster identified 11 such objects; provisional classification suggests that 6 are nitrogen rich (WN) and 5 carbon rich (WC). Including the previously identified Blue, Yellow & Red Super- & Hypergiants, Westerlund 1 clearly has a very rich population of massive post-Main Sequence objects. To date, the post-MS population of Westerlund 1 is significantly larger than that of any other galactic young open cluster - with the possible exception of the Arches - implying that it is potentially amongst the most massive young clusters yet identified in the Local Group.

Abstract Copyright: ∼

Journal keyword(s): stars: evolution - stars: Wolf Rayet - galaxies: starbursts

Nomenclature: Table 1: Cl* Westerlund 1 CN A (Nos A-K).

CDS comments: Objects YHG W NNN and YSG WN = Cl* Westerlund 1 W NNN.

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
2 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 211 0
3 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
4 HD 117297 WR* 13 30 53.2514208432 -62 04 51.858208308 10.81 11.10 10.90 10.70   WC8 100 0
5 Cl* Westerlund 1 CN I WR* 16 47 00.8820136008 -45 51 20.517977916       17.336 14.340 WN8o 21 0
6 Cl* Westerlund 1 BKS H s*y 16 47 01.4269856784 -45 50 37.248841536   18.781 14.47 11.80 9.15 F3Ia+ 31 0
7 Cl* Westerlund 1 W 12 s*y 16 47 02.2214295629 -45 50 58.987616665   22.0 17.575 13.611 10.42 A5Ia+ 27 0
8 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
9 Cl* Westerlund 1 CN J WR* 16 47 02.4735872095 -45 50 59.898935502           WN5h 16 0
10 Cl* Westerlund 1 W 237 s*r 16 47 03.1097130192 -45 52 18.960733164   22.8 19.008 13.634 9.19 M3I 32 0
11 WR 77g WR* 16 47 03.15 -45 50 43.8     19     WC8 17 0
12 Cl* Westerlund 1 W 7 s*b 16 47 03.6281794392 -45 50 14.365482036   20.0 15.972 12.73 9.99 B5Ia+ 31 0
13 Cl* Westerlund 1 BKS F s*y 16 47 03.6850109472 -45 50 43.536110712     15.05     F5Ia+ 23 0
14 Cl* Westerlund 1 W 46a s*b 16 47 03.9147803107 -45 51 19.743263385   23.0 18.55 15.537 12.499 B1Ia 18 0
15 Cl* Westerlund 1 CN G WR* 16 47 04.0152346631 -45 51 25.019757928   22.7 20.87 17.75 14.68 WN7o 24 0
16 Cl* Westerlund 1 W 33 s*b 16 47 04.1256274968 -45 50 48.488202564   20.090 15.61 12.803 10.04 B5Ia+ 26 0
17 Cl* Westerlund 1 CN H WR* 16 47 04.2489212873 -45 51 20.211867845           WC9d 17 0
18 Cl* Westerlund 1 CN C WR* 16 47 04.4125871144 -45 51 03.606604135           WC9d 17 0
19 Cl* Westerlund 1 CN F WR* 16 47 05.2114579896 -45 52 24.985725096   21.7 17.86 15.39 12.90 WC9d 33 0
20 Cl* Westerlund 1 CN B WR* 16 47 05.3717585660 -45 51 04.811705369     20.99 17.50 14.37 WN7o 32 0
21 Cl* Westerlund 1 CN E WR* 16 47 06.0667110144 -45 52 08.266249200     18.379 15.675 12.940 WC9 25 0
22 Cl* Westerlund 1 CN D WR* 16 47 06.2554455566 -45 51 26.391243810       18.935 15.600 WN7o 23 0
23 Cl* Westerlund 1 W 265 s*y 16 47 06.2785465416 -45 49 23.774098692   22.0 17.739 13.62 10.54 F1-5Ia+ 27 0
24 Cl* Westerlund 1 W 16 sg* 16 47 06.6158603112 -45 50 42.186706944   20.5 16.248 12.82 9.90 A5Ia+ 29 0
25 WR 77sc WR* 16 47 08.3538521592 -45 50 45.414739212     19.69 16.59 13.68 WN7b 32 0
26 Cl* Westerlund 1 W 71 s*b 16 47 08.4584673360 -45 50 49.338181284   21.5 17.531 14.158 11.16 B2.5Ia 24 0
27 2MASS J16470892-4549585 s*r 16 47 08.9198319768 -45 49 58.452357324     16.70     M4Ia 29 0
28 Cl* Westerlund 1 W 70 s*b 16 47 09.3836656992 -45 50 49.668960804   21.2 16.88 14.10 11.352 B3Ia 19 0
29 HD 157451 WR* 17 25 23.2779945960 -43 29 31.469964540 10 10.59 10.20 10.46   WC9 96 0
30 Cl Trumpler 27 OpC 17 36 20 -33 31.0   8.24 6.7     ~ 100 1
31 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
32 GCIRS 7 LP* 17 45 39.987 -29 00 22.24           M2 388 0
33 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
34 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 561 0
35 MR 80 WR* 18 02 04.1244400656 -23 37 42.168277056   15.002 13.155 12.056   WC9 241 1
36 HD 168206 WR* 18 19 07.3629298440 -11 37 59.164994424 9.65 9.88 9.10     WC8+O8/9III/V 308 1
37 HD 192103 WR* 20 11 53.5274337792 +36 11 50.525765304 7.77 8.13 8.11     WC8+OB: 339 0
38 Cl Berkeley 87 OpC 20 21 35.0 +37 25 14           ~ 141 0
39 * rho Cas LP* 23 54 23.0325302520 +57 29 57.774737400 7.00 5.85 4.59 3.63 2.89 G2_0 401 0
40 NAME Local Group GrG ~ ~           ~ 9325 0

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