2011MNRAS.410L...6G

Query : 2011MNRAS.410L...6G

2011MNRAS.410L...6G - Mon. Not. R. Astron. Soc., 410, L6-L7 (2011/January-1)

The distinction between star clusters and associations.

GIELES M. and PORTEGIES ZWART S.F.

Abstract (from CDS):

In Galactic studies a distinction is made between (open) star clusters and associations. For barely resolved objects at a distance of several Mpc, this distinction is not trivial to make. Here we provide an objective definition by comparing the age of the stars to the crossing time of nearby stellar agglomerates. We find that a satisfactory separation can be made where this ratio equals unity. Stellar agglomerates for which the age of the stars exceeds the crossing time are bound, and are referred to as star clusters. Alternatively, those for which the crossing time exceeds the stellar age are unbound and are referred to as associations. This definition is useful whenever reliable measurements for the mass, radius and age are available.

Abstract Copyright: 2010 The Authors. Monthly Notices of the Royal Astronomical Society2010 RAS

Journal keyword(s): stars: formation - open clusters and associations: general - galaxies: star clusters: general

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Bol 327 GlC 00 40 24.101 +40 36 22.64 16.55 16.90 16.58 16.31 16.00 ~ 47 1
2 NAME VDB 0 OpC 00 40 29.385 +40 36 15.20 14.957 14.94 15.288 15.056 14.701 ~ 44 2
3 [NVK2008] KW249 Cl* 00 41 30.761 +40 58 01.09 20.862   19.136 18.356 17.406 ~ 6 0
4 Bol 40 GlC 00 41 38.8429994184 +40 40 54.332136804 17.568 17.748 17.339 17.042 16.625 ~ 44 1
5 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12651 1
6 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 410 0
7 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 490 0
8 NGC 604 HII 01 34 32.1 +30 47 01           ~ 586 0
9 NGC 869 OpC 02 18 57.8 +57 08 02           ~ 476 0
10 NGC 884 OpC 02 22 20.2 +57 08 56           ~ 486 0
11 IC 1805 OpC 02 32 50.4 +61 28 16           ~ 519 1
12 NAME NGC 1569 CL* C Cl* 04 30 47.26 +64 51 02.3   18.85 17.41     ~ 19 1
13 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 103 1
14 NAME NGC 1569 CL* B Cl* 04 30 49.0 +64 50 53           ~ 75 0
15 [HOG2000] 30 Cl* 04 30 49.22 +64 51 02.0           ~ 13 0
16 NGC 1711 Cl* 04 50 37.320 -69 59 01.72   11.22 11.10     ~ 113 0
17 NGC 1847 Cl* 05 07 08.200 -68 58 15.49   12.508 12.469     ~ 89 0
18 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 273 1
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17437 0
20 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 266 0
21 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2332 0
22 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 137 1
23 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2019 2
24 NGC 2136 Cl* 05 53 01.800 -69 29 24.24   10.99 10.70     ~ 118 1
25 NGC 2157 Cl* 05 57 35.430 -69 11 48.67   10.35 10.16     ~ 120 0
26 NGC 2214 OpC 06 12 57 -68 15.6   11.04 10.93     ~ 119 0
27 MGG 11 Cl* 09 55 50.2 +69 40 45           ~ 69 0
28 MGG 9 Cl* 09 55 50.5 +69 40 45           ~ 24 0
29 [SWG2006] A1 Cl* 09 55 53.5 +69 40 49           ~ 31 0
30 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 356 0
31 Cl Trumpler 14 OpC 10 43 56.6 -59 33 11   5.70 5.5     ~ 509 0
32 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 477 1
33 [L2004] n5236-805 Cl* 13 37 01.8406131168 -29 52 13.394492436   16.37 16.14     ~ 21 0
34 [L99] n5236-502 Cl* 13 37 06.12 -29 53 18.4     17.51     ~ 12 0
35 Cl Westerlund 1 Cl* 16 47 02.4 -45 51 07           ~ 566 0
36 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 738 0
37 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 526 0
38 RSGC 1 OpC 18 37 58 -06 53.0           ~ 106 0
39 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 93 0
40 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 53 0
41 Schulte 8C * 20 33 17.9820761856 +41 18 31.194812988 12.2 11.43 10.19     O4.5III(fc) 83 0
42 [L2004] n6946-1447 Cl* 20 34 32.03 +60 08 14.7   15.71 15.7     ~ 24 0
43 Ass Ori OB 1a As* ~ ~           ~ 230 0

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