2013AJ....145...46L


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET15:08:31

2013AJ....145...46L - Astron. J., 145, 46 (2013/February-0)

The starburst cluster Westerlund 1: the initial mass function and mass segregation.

LIM B., CHUN M.-Y., SUNG H., PARK B.-G., LEE J.-J., SOHN S.T., HUR H. and BESSELL M.S.

Abstract (from CDS):

Westerlund 1 is the most important starburst cluster in the Galaxy due to its massive star content. We have performed BVIC and JKSphotometry to investigate the initial mass function (IMF). By comparing the observed color with the spectral-type-intrinsic-color relation, we obtain the mean interstellar reddening of < E(B - V) > = 4.19±0.23 and < E(J - KS ) > = 1.70±0.21. Due to the heavy extinction toward the cluster, the zero-age main sequence fitting method based on optical photometry proved to be inappropriate for the distance determination, while the near-infrared photometry gave a reliable distance to the cluster–3.8 kpc from the empirical relation. Using the recent theoretical stellar evolution models with rotation, the age of the cluster is estimated to be 5.0±1.0 Myr. We derived the IMF in the massive part and obtained a fairly shallow slope of Γ = -0.8 ±0.1. The integration of the IMF gave a total mass for the cluster in excess of 5.0x104 M. The IMF shows a clear radial variation indicating the presence of mass segregation. We also discuss the possible star formation history of Westerlund 1 from the presence of red supergiants and relatively low luminosity yellow hypergiants.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Westerlund 1 - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/AJ/145/46): table4.dat>

Nomenclature: Table 4: [LCS2013] NNNNN (Nos 1-27521).

Status in Simbad:  could be processed

CDS comments: the radio source A2 is not in Simbad. WR stars B, N, T, X and S = "Cl* Westerlund 1 CN A" in Simbad.

Simbad objects: 51

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Number of rows : 51

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 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5462 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14492 1
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1924 1
4 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1690 2
5 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1562 1
6 NGC 2362 OpC 07 18 41 -24 57.3     4.1     ~ 357 0
7 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 266 0
8 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 418 0
9 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 875 2
10 Cl Trumpler 16 OpC 10 45 10 -59 43.0   5.35 5.0     ~ 418 0
11 NGC 3603 HII 11 15 24 -61 15.0           ~ 926 2
12 Cl Hogg 15 OpC 12 43 36 -63 05.9   11.21 10.3     ~ 41 0
13 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 416 1
14 NAME Nor Arm PoG 16 00 -50.0           ~ 329 0
15 WR 77aa WR* 16 46 46.2846645677 -45 47 58.263027602       15.516 13.063 WC9d 5 0
16 [B2007] J164657.71-455320.0 V* 16 46 57.7256759569 -45 53 20.034351977       14.741 12.318 B0Iab 6 0
17 Cl* Westerlund 1 W 228b * 16 46 58.05 -45 53 01.0           O9Ib 4 0
18 WR 77b WR* 16 46 59.90 -45 55 25.6       16.9 13.0 WC9d 8 0
19 Cl* Westerlund 1 W 57a * 16 47 01.3597701480 -45 51 45.799486574   20.7 16.877 13.83 11.13 B4Ia 10 0
20 Cl* Westerlund 1 BKS H * 16 47 01.4273629136 -45 50 37.260634424   18.781 14.47     F3Ia+ 22 0
21 Cl* Westerlund 1 W 12 * 16 47 02.23 -45 50 59.1   22.0 17.575 13.611   F1Ia+ 20 0
22 WR 77f WR* 16 47 02.96 -45 50 19.7   21.552 17.792 15.035 12.508 WN10-11h 23 0
23 Cl* Westerlund 1 BKS B * 16 47 03.1074828977 -45 52 18.957165027   22.8 19.008 13.634   M3Ia 20 0
24 Hen 3-1250 Em* 16 47 03.6265799796 -45 50 14.357624931   20.0 15.972     B5Ia+ 22 0
25 Cl* Westerlund 1 BKS F s*y 16 47 03.6836562279 -45 50 43.530430986     15.05     F5Ia+ 18 0
26 Cl* Westerlund 1 W 43c * 16 47 03.76 -45 50 58.3   20.4 18.35 16.18 13.66 O9Ib 5 0
27 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 449 0
28 Cl* Westerlund 1 W 33 * 16 47 04.1266525740 -45 50 48.475675980   20.090 15.61 12.803   B5Ia+ 19 0
29 Cl* Westerlund 1 W 9 WR* 16 47 04.1422943113 -45 50 31.307461802   21.8 17.47 14.47 11.74 Be 45 0
30 Cl* Westerlund 1 W 20 s*r 16 47 04.6954939457 -45 51 23.957603850       15.660   M6I 17 0
31 Cl* Westerlund 1 W 8 * 16 47 04.81 -45 50 25.2   19.9 15.913     F8Ia+ 14 0
32 WR 77o WR* 16 47 05.37 -45 51 04.7     20.99 17.50 14.37 WN7o 20 0
33 Cl* Westerlund 1 BKS AS * 16 47 05.4063692757 -45 50 36.608299661   22.1 16.79     M5-6Ia 28 0
34 Cl* Westerlund 1 W 265 * 16 47 06.2786920752 -45 49 23.781230202   22.0 17.739   10.54 F1-5Ia+ 19 0
35 Cl* Westerlund 1 W 13 EB* 16 47 06.4536718776 -45 50 26.067083031   21.1 17.19 14.63 12.06 BIa+ 26 0
36 Cl* Westerlund 1 W 16 * 16 47 06.6152064188 -45 50 42.171179650   20.5 16.248     A5Ia+ 22 0
37 Cl* Westerlund 1 W 243 s*b 16 47 07.5028508821 -45 52 29.152464693   19.873 15.730     LBV 49 0
38 Cl* Westerlund 1 BKS E * 16 47 08.9189383747 -45 49 58.452680562     16.70     M4Ia 17 0
39 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 171 1
40 WR 77sd WR* 16 47 14.14 -45 48 32.1           WN5o 4 0
41 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 477 0
42 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11189 0
43 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 618 0
44 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 434 0
45 NGC 6530 OpC 18 04 31 -24 21.5   4.74 4.6     ~ 343 1
46 V* VX Sgr s*r 18 08 04.0431479808 -22 13 26.629744195 11.72 9.41 6.52 3.90 2.11 M8.5Ia 539 0
47 NAME Sgr Arm PoG 19 00 -30.0           ~ 505 1
48 NGC 6823 OpC 19 43 09 +23 18.0   7.71 7.1     ~ 247 2
49 V* V509 Cas LP* 23 00 05.1007915562 +56 56 43.348681058 8.01 6.68 5.13 3.96 3.11 G4_0 309 0
50 * rho Cas LP* 23 54 23.0339951270 +57 29 57.766930774 7.00 5.85 4.59 3.63 2.89 G2_0 359 0
51 NAME Sct-Cen PoG ~ ~           ~ 123 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-15:08:31

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