2017AJ....153...57Z

Query : 2017AJ....153...57Z

2017AJ....153...57Z - Astron. J., 153, 57-57 (2017/February-0)

The shape evolution of Galactic open clusters from observations under Galactic external forces.

ZHAI M., ABT H., ZHAO G. and LI C.

Abstract (from CDS):

We present the Galactic characteristics of 154 open clusters using the stellar statistics method with data from the WEBDA database. We find that all clusters in our sample are elongated in shape, which indicates that the spherical clusters are stretched out to be ellipsoid as a function of age (log(age/year)=6.64–9.7). By dividing a cluster into a central core and an outer part, we have computed the apparent ellipticities of these two parts respectively. The scale relations between ellipticities and age indicate that the outer parts of open clusters become more elliptical while the central cores remain circular. We suppose that the outer parts become more elliptical because they are more subjected to the external forces, e.g., Galactic differential rotation, while the central cores form a circular shape under the domination of stellar dynamics. We have also performed an analysis of the crucial influence of cluster mass and location on its shape.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: stellar content - methods: statistical - open clusters and associations: general - open clusters and associations: general

VizieR on-line data: <Available at CDS (J/AJ/153/57): table1.dat>

Simbad objects: 157

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Number of rows : 157
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 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 [KPR2005] 4 OpC 00 53 10 +61 34.8           ~ 20 0
3 NGC 457 OpC 01 19 32.4 +58 16 40   6.97 6.4     ~ 259 2
4 NGC 559 OpC 01 29 33.2 +63 18 02   9.85 9.5     ~ 81 0
5 [KPR2005] 6 OpC 01 47 22.1 +57 43 56           ~ 36 0
6 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
7 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
8 [KPR2005] 8 OpC 02 20 49 +59 36.6           ~ 21 0
9 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
10 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
11 NGC 1039 OpC 02 42 09.1 +42 44 02           ~ 467 0
12 C 0255+602 Cl* 02 59.3 +60 24     5.9     ~ 17 0
13 Cl Trumpler 3 OpC 03 12 00.3 +63 12 35     7.0     ~ 57 0
14 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 870 1
15 NGC 1342 OpC 03 31 37.4 +37 23 23   7.35 6.7     ~ 133 0
16 [KPR2005] 11 OpC 03 32 18.3 +44 51 57           ~ 48 0
17 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
18 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
19 NGC 1513 OpC 04 09 53.9 +49 30 15   8.71 8.4     ~ 70 0
20 NGC 1528 OpC 04 15 27.4 +51 13 21   6.83 6.4     ~ 133 0
21 NGC 1647 OpC 04 46 00.4 +19 05 06   6.82 6.4     ~ 189 0
22 NGC 1664 OpC 04 50 59.3 +43 39 48           ~ 143 0
23 NGC 1746 err 05 03 50 +23 46.2           ~ 40 0
24 NAME HIP 23784 Cluster OpC 05 07 22 +22 16.7           ~ 28 0
25 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
26 [KPR2005] 13 OpC 05 12 53.0 +44 21 18           ~ 44 0
27 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
28 NAME 25 Ori Group OpC 05 24 50.9 +01 41 38           ~ 195 1
29 Cl Collinder 65 OpC 05 26 06 +16 42.0           ~ 35 0
30 [KPR2005] 19 OpC 05 28 06.0 -01 56 32           ~ 75 0
31 [KPR2005] 21 OpC 05 28 26.6 +03 33 00           ~ 75 0
32 [KPR2005] 20 OpC 05 28 44 +01 37.8           ~ 51 0
33 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
34 Cl Collinder 70 OpC 05 35 30 -01 06.0           ~ 65 0
35 M 37 OpC 05 52 18.6 +32 32 36           ~ 436 0
36 IC 2157 OpC 06 04 44.7 +24 05 09   8.91 8.4     ~ 51 0
37 NGC 2158 OpC 06 07 26.7 +24 05 53           ~ 317 0
38 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
39 NAME HIP 29713 Cluster MGr 06 15 26 +03 50.7           ~ 31 0
40 Cl Collinder 89 OpC 06 18 00 +23 38.0     5.7     ~ 29 0
41 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
42 Cl Collinder 106 OpC 06 37 02.6 +05 59 54     4.6     ~ 55 0
43 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
44 NGC 2270 OpC 06 43 57 +03 28.7           ~ 27 1
45 M 41 OpC 06 46 03.1 -20 43 07   4.89 4.5     ~ 308 0
46 NGC 2281 OpC 06 48 19.7 +41 02 35   6.05 5.4     ~ 182 0
47 NGC 2301 OpC 06 51 51.0 +00 28 35   6.30 6.0     ~ 173 0
48 [KPR2005] 28 OpC 06 54 04 -00 10.2           ~ 18 0
49 [KPR2005] 30 OpC 06 57 03.5 -06 14 09           ~ 31 0
50 Cl Alessi 33 OpC 07 02 42.6 -26 29 21           ~ 40 0
51 [KPR2005] 33 OpC 07 03 11 -25 03.0           ~ 22 0
52 [KPR2005] 35 OpC 07 12.7 +02 07           ~ 16 0
53 NGC 2396 OpC 07 27 59.9 -11 42 19     7.4     ~ 42 0
54 Cl Haffner 13 OpC 07 40 54.3 -30 02 52           ~ 59 0
55 NGC 2448 OpC 07 44 21.4 -24 53 39           ~ 47 1
56 NGC 2451 Cl* 07 45.4 -37 58           ~ 165 1
57 [KPR2005] 43 OpC 07 53 06 -28 10.2           ~ 18 0
58 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
59 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
60 NGC 2548 OpC 08 13 34.0 -05 43 11           ~ 227 0
61 [KPR2005] 47 OpC 08 31 44 -39 07.9           ~ 27 0
62 Cl Ruprecht 64 OpC 08 37 20 -40 09.0           ~ 26 0
63 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
64 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
65 [KPR2005] 51 OpC 09 18.0 -69 41           ~ 24 0
66 [KPR2005] 52 OpC 09 27 58 -54 15.6           ~ 14 0
67 Cl Turner 5 OpC 09 34 04.0 -36 26 03           ~ 48 0
68 [KPR2005] 53 OpC 09 37.9 -59 33           ~ 12 0
69 [KPR2005] 54 OpC 09 44.8 -54 26           ~ 12 0
70 [KPR2005] 55 OpC 09 54.3 -57 05           ~ 14 0
71 Cl Ruprecht 161 OpC 10 09 49.2 -61 16 09           ~ 44 0
72 [KPR2005] 57 OpC 10 10.8 -66 41           ~ 15 0
73 [KPR2005] 58 OpC 10 14 01.8 -55 06 13           ~ 53 0
74 [KPR2005] 59 OpC 10 20.2 -57 39           ~ 18 0
75 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
76 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
77 [KPR2005] 61 OpC 10 46.1 -56 52           ~ 18 0
78 [KPR2005] 62 OpC 10 50 53 -60 06.0           ~ 16 0
79 Cl Collinder 236 OpC 10 57 22 -61 07.2           ~ 29 0
80 [KPR2005] 64 OpC 11 03 04 -60 55.2           ~ 20 0
81 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
82 [KPR2005] 65 OpC 11 11 06 -61 07.2           ~ 18 0
83 Cl Ruprecht 94 OpC 11 30 52.1 -63 25 08           ~ 39 0
84 Cl Collinder 249 OpC 11 38 40.1 -63 23 27           ~ 38 0
85 [KPR2005] 67 OpC 11 41 24.9 -61 02 43           ~ 26 0
86 Cl Loden 481 OpC 11 51 47 -61 17.0           ~ 21 0
87 [KPR2005] 68 OpC 11 59 54.6 -60 39 59           ~ 38 0
88 NGC 4103 OpC 12 06 35.0 -61 14 47     7.4     ~ 104 1
89 [KPR2005] 69 OpC 12 06 36 -69 46.2           ~ 27 0
90 [KPR2005] 70 OpC 12 15 00 -64 25.8           ~ 14 0
91 [KPR2005] 71 OpC 12 20 22.3 -67 31 57           ~ 37 0
92 [KPR2005] 72 OpC 12 33.0 -60 57           ~ 13 0
93 [KPR2005] 73 OpC 12 36 30.7 -67 11 30           ~ 33 0
94 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
95 [KPR2004b] 317 OpC 12 53 01 -60 46.0           ~ 20 0
96 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
97 NGC 5045 OpC 13 14 10 -63 23.4           ~ 22 0
98 [KPR2005] 77 OpC 14 10 44.4 -62 20 42           ~ 27 0
99 NGC 5662 OpC 14 34 55.5 -56 40 41   6.18 5.5     ~ 136 0
100 Cl Alessi 6 OpC 14 40 08.8 -66 07 35           ~ 47 0
101 [KPR2005] 79 OpC 15 18 58.4 -60 52 41           ~ 43 0
102 [KPR2005] 82 OpC 15 47.4 -64 25           ~ 15 0
103 NGC 6087 OpC 16 18 55.7 -57 53 32           ~ 198 0
104 NGC 6152 OpC 16 32 43.9 -52 37 18     8.1     ~ 41 0
105 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
106 [KPR2005] 86 OpC 17 01 37.4 -59 00 10           ~ 37 0
107 [KPR2005] 87 OpC 17 02 38.5 -28 26 04           ~ 30 0
108 [KPR2005] 88 OpC 17 07 32.9 -35 33 46           ~ 42 0
109 [KPR2005] 89 Cl* 17 23.3 -62 38           ~ 12 0
110 [KPR2005] 90 OpC 17 38 55.7 -34 47 06           ~ 32 0
111 Cl Alessi 9 OpC 17 44 16.5 -47 03 45           ~ 66 0
112 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
113 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
114 Cl Collinder 350 OpC 17 47 54.6 +01 31 22     6.1     ~ 73 0
115 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0
116 M 23 OpC 17 56 56.2 -18 58 21           ~ 144 0
117 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
118 [KPR2005] 93 OpC 18 08 13 -22 15.6           ~ 20 0
119 C 1806-240 OpC 18 09 51 -23 49.7     6.4     ~ 24 0
120 NGC 6568 OpC 18 12 49.6 -21 36 46     8.6     ~ 40 0
121 UBC 342 OpC 18 15 42.5 -14 54 50           ~ 25 0
122 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
123 Cl Alessi 19 OpC 18 19 02.4 +12 20 50           ~ 45 0
124 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
125 IC 4725 OpC 18 31 47.5 -19 07 37           ~ 239 0
126 Cl Alessi 40 OpC 18 37 12.2 -19 09 37           ~ 37 0
127 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
128 [KPR2005] 98 OpC 18 42 36 -33 37.8           ~ 18 0
129 Cl Ruprecht 145 OpC 18 50 41.0 -18 16 24           ~ 50 0
130 NGC 6705 OpC 18 51 03.7 -06 16 18   6.32 5.8     ~ 442 0
131 NGC 6774 OpC 19 16 17.6 -16 20 45           ~ 258 0
132 Teutsch 35 OpC 19 36 32.1 +35 45 00           ~ 44 0
133 [KPR2005] 104 OpC 19 38 53 +18 41.4           ~ 20 0
134 Cl Alessi 44 OpC 19 42 05.0 +01 26 22           ~ 42 0
135 [KPR2005] 105 OpC 19 42 25.1 +27 22 42           ~ 48 0
136 NGC 6823 OpC 19 43 11.3 +23 18 32   7.71 7.1     ~ 279 2
137 [KPR2005] 109 OpC 19 54.0 +34 35           ~ 15 0
138 [KPR2005] 111 OpC 20 11 31.0 +37 30 18           ~ 38 0
139 M 29 OpC 20 23 42.9 +38 29 25   7.30 6.6     ~ 256 0
140 NGC 6939 OpC 20 31 40.6 +60 38 54           ~ 171 0
141 NGC 6940 OpC 20 34 28.4 +28 17 07           ~ 215 0
142 Cl Alessi 12 OpC 20 43 27.0 +23 51 12           ~ 57 0
143 Cl Roslund 7 OpC 20 52 56.3 +37 52 06           ~ 42 0
144 NGC 6991 OpC 20 54 31.8 +47 23 26           ~ 77 2
145 [KPR2005] 113 OpC 21 11 54.5 +38 44 19           ~ 49 0
146 NGC 7092 OpC 21 31 04.0 +48 17 47           ~ 245 0
147 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
148 NGC 7209 OpC 22 04 50.7 +46 30 11   8.24 7.7     ~ 144 0
149 NGC 7243 OpC 22 15 16.0 +49 50 07   6.54 6.4     ~ 133 0
150 [KPR2005] 120 OpC 22 30 36 +57 12.6           ~ 18 0
151 [KPR2005] 122 OpC 22 33 14 +39 36.6           ~ 18 0
152 [KPR2005] 123 OpC 22 42 14.8 +54 00 20           ~ 49 0
153 [KPR2005] 125 OpC 22 56 17 +62 45.0           ~ 16 0
154 [KPR2005] 127 OpC 23 09 14.3 +64 59 56           ~ 51 0
155 [KPR2005] 128 OpC 23 18 35.2 +54 22 09           ~ 37 0
156 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
157 NGC 7790 OpC 23 58 27.6 +61 12 33   9.18 8.5     ~ 286 0

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