2002A&A...392..869L

Query : 2002A&A...392..869L

2002A&A...392..869L - Astronomy and Astrophysics, volume 392, 869-884 (2002/9-4)

Characteristics of new star cluster candidates in the Cygnus area.

LE DUIGOU J.-M. and KNOEDLSEDER J.

Abstract (from CDS):

The morphology and stellar content of 22 clusters in the Cygnus area has been determined using 2MASS infrared observations in the J and K bands. 7 of the clusters are well-known objects and our results are in good agreement with previous work. 12 objects are recently-discovered cluster candidates (Dutra & Bica 2001A&A...376..434D) and 3 are new cluster candidates. Adopting distance estimates from the literature or by considering cluster counterparts, we derive a consistent set of parameters suitable for analysis and comparison: center coordinates, radius, stellar population, IMF slope and mass range. We find a mean IMF slope of Γ=-1.30 for the known clusters and Γ=-1.40 for the others. Infrared data having better completeness, we derive larger stellar contents and cluster masses than previous works. An important fraction of the cluster stellar population in Cygnus is hidden in very obscured areas. A clear tendency towards mass segregation appears for most of the clusters. Some of the new clusters seem to be quite massive, probably hosting very massive stars at the center. They are privileged targets for more detailed investigations using infrared spectroscopy.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - ISM: dust: extinction - open clusters and associations: individual: Cygnus - Galaxy: stellar content

Nomenclature: Table 3: [LK2002] ClNN (Nos Cl01 to Cl15).

CDS comments: AX J2035.4+4229 is a misprint for AX J2035.9+4229, [L89b] 81.342+01.123 for [L89b] 81.342+01.200.

Simbad objects: 71

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Number of rows : 71
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 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
2 NGC 6871 OpC 20 06 11.5 +35 45 54   5.43 5.2     ~ 225 0
3 IC 4996 OpC 20 16 32.4 +37 38 56           ~ 177 0
4 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 264 1
5 Cl VDB 130 OpC 20 18 00 +39 19.8   9.87 9.3     ~ 20 1
6 Cl Berkeley 85 OpC 20 18 46.1 +37 44 38           ~ 28 0
7 Cl Berkeley 86 OpC 20 20 20 +38 41.3           ~ 123 0
8 Ass Cyg OB 9 As* 20 21 +39.9           ~ 131 0
9 Cl Berkeley 87 OpC 20 21 35.0 +37 25 59           ~ 132 0
10 NGC 6910 OpC 20 23 11 +40 46.3           ~ 193 0
11 M 29 OpC 20 23 46 +38 29.2   7.30 6.6     ~ 245 0
12 [LK2002] Cl01 OpC 20 24 25 +36 24.3           ~ 2 0
13 2MASS J20242862+3624345 * 20 24 28.6144396656 +36 24 34.493191416           B3V 1 0
14 IRAS 20237+3915 * 20 25 35.9082489432 +39 25 32.231386488           ~ 3 0
15 2MASS J20253741+3924380 * 20 25 37.4152602480 +39 24 38.027524392           O4V 1 0
16 [LK2002] Cl03 OpC 20 25 38 +39 24.6           ~ 4 0
17 2MASS J20271064+3926280 Y*O 20 27 10.6452374088 +39 26 28.006499904           O7.5V 2 0
18 NAME DR 6 IR Cluster OpC 20 27 13.0 +39 26 56           ~ 7 0
19 18P 37 HII 20 27 13.1 +39 26 08           ~ 20 0
20 NAME SH 2-106 IR Cluster OpC 20 27 23 +37 22.8           ~ 10 1
21 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 163 1
22 2MASS J20272677+3722477 Y*O 20 27 26.7731405016 +37 22 47.849902500           B0V 5 0
23 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 440 1
24 DR 7 HII 20 28 09.5 +40 51 43           ~ 45 0
25 NAME IRAS 20264+4042 Cluster OpC 20 28 09.7 +40 52 42           ~ 9 0
26 2MASS J20281066+4050243 * 20 28 10.67 +40 50 24.3           B1V 1 0
27 IRAS 20264+4042 IR 20 28 12.4 +40 52 28           ~ 21 0
28 DR 9 HII 20 28 58 +39 02.1           ~ 14 0
29 GAL 077.96-00.01 HII 20 29 36.72 +39 01 21.9           ~ 40 1
30 NAME DR 9 IR Cluster OpC 20 29 36.9 +39 01 15           ~ 5 0
31 2MASS J20293713+3901559 * 20 29 37.13 +39 01 55.9           O4V 1 0
32 DR 13 HII 20 31 00 +38 58.2           ~ 17 0
33 [ABB2014] WISE G078.177-00.363 HII 20 31 42.8 +38 58 13           ~ 6 0
34 NAME DR 13 IR Stellar Group OpC 20 31 45.4 +38 58 00           ~ 4 0
35 2MASS J20314548+3857592 * 20 31 45.48 +38 57 59.3           O7.5V 1 0
36 NAME Cyg Complex reg 20 32 +45.0           ~ 601 0
37 WSRTGP 2030+3840 Rad 20 32 25.2 +38 50 53           ~ 2 0
38 2MASS J20322700+3851255 * 20 32 27.0068424192 +38 51 25.654125024           O5.5V 1 0
39 NAME IRAS 20306+3841 Cluster OpC 20 32 27.8 +38 51 26           ~ 5 0
40 [BNM96] 079.296+0.284 HII 20 32 27.9387239688 +40 16 07.617565056           ~ 30 0
41 IRAS 20306+3841 * 20 32 28.18 +38 51 30.7           ~ 6 0
42 NAME DR 15 IR Cluster OpC 20 32 29.0 +40 16 30           ~ 7 0
43 2MASS J20323100+4016499 * 20 32 31.01 +40 16 50.0           B2V 2 0
44 18P 59 HII 20 32 31.2 +40 16 35           ~ 71 0
45 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0
46 [KC97c] G081.3+01.2 HII 20 35 03.5 +42 27 26           ~ 5 0
47 [KC97c] G081.3+01.1 HII 20 35 06.2 +42 20 24           ~ 7 0
48 DR 17 HII 20 35.2 +42 25           ~ 43 0
49 NAME DR 17 IR Cluster OpC 20 35 23.0 +42 22 05           ~ 13 0
50 2MASS J20352379+4122037 * 20 35 23.793 +41 22 03.73           O8.5V 1 0
51 AX J2035.4+4222 X 20 35 24.3 +42 22 04           ~ 3 0
52 HFE 67 IR 20 35.6 +42 32           ~ 2 0
53 2MASS J20354295+4229419 * 20 35 42.9599369616 +42 29 41.831857752           O5.5V 1 0
54 [LK2002] Cl14 OpC 20 35 43 +42 29.4           ~ 8 0
55 AX J2035.9+4229 X 20 35 55.2 +42 29 09           ~ 2 0
56 [KC97c] G081.5+00.6 HII 20 38 15.9 +42 10 55           ~ 4 0
57 RAFGL 2620 IR 20 38 18.24 +42 06 17.4           ~ 5 0
58 NVSS J203828+420622 Rad 20 38 28.2 +42 06 22           ~ 4 1
59 [BDB2003] G081.44+00.48 OpC 20 38 29.0 +42 06 25           ~ 11 0
60 2MASS J20382923+4222144 * 20 38 29.23 +42 22 14.4           B0.5V 2 0
61 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1055 0
62 [LK2002] Cl10 OpC 20 39 13 +39 58.6           ~ 6 0
63 2MASS J20391329+3958157 * 20 39 13.3004778984 +39 58 15.644035416           B0.5v 1 0
64 DR 22 HII 20 39 16.67 +41 18 44.7           ~ 48 1
65 IRAS Z20376+4109 Y*O 20 39 25.8 +41 20 02           ~ 25 1
66 NAME DR 22 Star Cluster OpC 20 39 34.0 +41 19 05           ~ 7 1
67 2MASS J20393409+4116564 LP? 20 39 34.0993746336 +41 16 56.546829336           O7V 2 0
68 2MASS J20402979+4203138 * 20 40 29.7858794160 +42 03 13.865018076           O5V 1 0
69 MITG J2040+4200 Rad 20 40 30.2 +42 00 20           ~ 2 0
70 DR 23 Rad 20 40.8 +41 54           ~ 40 0
71 NAME DR 23 IR Cluster OpC 20 41 15.9 +41 51 51           ~ 10 0

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