2004AJ....128.2306C

Query : 2004AJ....128.2306C

2004AJ....128.2306C - Astron. J., 128, 2306-2315 (2004/November-0)

Morphology of galactic open clusters.

CHEN W.P., CHEN C.W. and SHU C.G.

Abstract (from CDS):

We analyzed the shapes of Galactic open clusters by the star-counting technique with the Two Micron All Sky Survey star catalog database. Morphological parameters such as the ellipticity and size have been derived via stellar density distribution, weighed by clustering probability. We find that most star clusters are elongated, even for the youngest star clusters of a few million years old, which are located near the Galactic disk. The shapes of young star clusters must reflect the conditions in the parental molecular clouds and during the cluster formation process. As an open cluster ages, stellar dynamics cause the inner part of the cluster to circularize, but the overall radius gets larger and the stellar density becomes sparser. We discuss how the internal relaxation process competes with Galactic external perturbation during cluster evolution.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Star Clusters - Methods: Data Analysis - Stellar Dynamics

Simbad objects: 35

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Number of rows : 35
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 Cl King 5 OpC 03 14 43.6 +52 41 52           ~ 84 0
3 NGC 1245 OpC 03 14 44.3 +47 14 06   9.16 8.4     ~ 171 0
4 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
5 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
6 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
7 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
8 NGC 1893 OpC 05 22 52.8 +33 26 32           ~ 270 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
10 Cl Berkeley 69 OpC 05 24 21.1 +32 36 13           ~ 50 0
11 NGC 1907 OpC 05 28 07.2 +35 19 33   8.87 8.2     ~ 140 2
12 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 136 0
13 M 36 OpC 05 36 19.8 +34 08 02   6.09 6.0     ~ 206 2
14 Cl King 8 OpC 05 49 18.1 +33 38 01   11.90 11.2     ~ 71 0
15 Cl Berkeley 21 OpC 05 51 44.7 +21 48 36   12.26 11.1     ~ 130 0
16 NGC 2158 OpC 06 07 26.7 +24 05 53           ~ 317 0
17 NGC 2194 OpC 06 13 44.8 +12 48 48   9.03 8.5     ~ 90 1
18 NGC 2204 OpC 06 15 31.5 -18 40 28   9.35 8.6     ~ 172 0
19 NGC 2304 OpC 06 55 12.5 +17 59 03     10.0     ~ 49 0
20 Cl Haffner 2 OpC 07 03 06.2 -20 49 07           ~ 146 0
21 NGC 2354 OpC 07 13 59.2 -25 43 40   7.28 6.5     ~ 111 0
22 NGC 2355 OpC 07 16 59.1 +13 46 09     9.7     ~ 127 0
23 Cl Ruprecht 18 OpC 07 24 36.3 -26 13 20   9.90 9.4     ~ 57 0
24 NGC 2383 OpC 07 24 41.7 -20 56 54   8.88 8.4     ~ 75 0
25 Cl Trumpler 7 OpC 07 27 22.3 -23 56 40           ~ 59 0
26 NGC 2414 OpC 07 33 10.7 -15 26 56   8.33 7.9     ~ 87 0
27 NGC 2421 OpC 07 36 12.1 -20 37 33   8.69 8.3     ~ 64 0
28 Cl Melotte 71 OpC 07 37 31.3 -12 03 42   7.44 7.1     ~ 149 0
29 NGC 2425 OpC 07 38 18.4 -14 53 32           ~ 64 0
30 NGC 2420 OpC 07 38 24.6 +21 34 26   9.0 8.3     ~ 523 0
31 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
32 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
33 NGC 2567 OpC 08 18 36.9 -30 38 15   7.77 7.4     ~ 97 0
34 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
35 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0

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