2010MNRAS.407..133S

Query : 2010MNRAS.407..133S

2010MNRAS.407..133S - Mon. Not. R. Astron. Soc., 407, 133-143 (2010/September-1)

Star clusters in the Sh2-132 complex: clues about the connection between embedded and open clusters.

SAURIN T.A., BICA E. and BONATTO C.

Abstract (from CDS):

Embedded clusters are formed in molecular clouds where massive stars can produce HII regions. The detailed evolutionary connection between embedded and open clusters, and the origin of associations are still to be discovered. There appears to be a high infant mortality rate among embedded clusters, and the few survivors evolve to open clusters. We study the colour-magnitude diagrams (CMDs) and structure of the star clusters related to the Sh2-132 HII region using the Two-Micron All-Sky Survey (2MASS) data base. The fundamental and structural parameters of clusters are determined using main-sequence and pre-main-sequence isochrones and stellar radial density profiles. We report on the discovery of four clusters. One of these is projected a few diameters away from the optical cluster, Teutsch 127, and appears to be deeply embedded, seen only in the infrared. Evidence is found that we are witnessing the dynamical transition from an embedded to an open cluster. An additional cluster is also close to Teutsch 127 and might be associated with a bow-shock. We also study the CMD and structure of the open cluster, Berkeley 94, in Sh2-132, and a new cluster that is projected in the outskirts of the complex. Finally, we have searched for star clusters around the two known Wolf-Rayet stars in the complex. One of these appears to be related to a compact cluster. Finally, the present analyses suggest early dynamical evolution for young star clusters.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): stars: formation - open clusters and associations: individual: Teutsch 127 - open clusters and associations: individual: Berkeley 94

Nomenclature: Fig. 1, Table 1: [SBB2010] N (Nos 1-4).

Simbad objects: 37

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Number of rows : 37
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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 136 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
4 Cl Bochum 1 OpC 06 25 18 +19 46.8   8.08 7.9     ~ 52 1
5 Cl VDB 80 OpC 06 31 05.3 -09 36 35           ~ 26 1
6 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
7 LBN 211.65-01.51 HII 06 45 28 +00 17.8           ~ 75 0
8 [BDS2003] 96 OpC 07 05 20.3 -12 19 38           ~ 32 0
9 Cl Pismis 5 OpC 08 37 37.1 -39 35 23           ~ 48 0
10 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
11 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
12 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
13 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
14 NAME Cyg Arm PoG 20 02 +40.0           ~ 163 0
15 LDN 1150 DNe 22 15.8 +56 00           ~ 5 0
16 HD 211564 WR* 22 16 24.0318845736 +55 37 36.767570232   11.72 11.61     WN3(h)-w 123 0
17 NAME SBB 3 OpC 22 16 24.10 +55 37 37.0           ~ 1 0
18 LDN 1154 DNe 22 16.8 +56 13           ~ 5 0
19 HD 211853 WR* 22 18 45.6057566664 +56 07 33.898679364 8.84 9.534 9.236 9.108   WN6o+O6I 283 0
20 NAME SBB 2 Cl* 22 18 56.70 +56 05 10.9           ~ 7 0
21 BD+55 2722 Y*O 22 18 58.6254723768 +56 07 23.482698528 9.79 10.59 10.15 9.93   O7V(n)z+B 45 0
22 DSH J2218.9+5607 OpC 22 18 59.0 +56 07 18           ~ 19 1
23 LS III +55 37 EB* 22 18 59.8740345120 +56 07 18.852642228 10.76 11.0 10.6     O7V 19 0
24 NAME SBB 1 Cl* 22 19 08.20 +56 05 17.5           ~ 2 0
25 LBN 102.79-00.92 HII 22 19 09.0 +56 04 45           ~ 109 0
26 IRAS 22172+5549 Y*O 22 19 09.14787 +56 05 00.0380           ~ 105 0
27 LDN 1161 DNe 22 19.9 +56 08           ~ 4 0
28 Cl Berkeley 94 6 * 22 22 47.7958903968 +55 52 26.249383668   12.59 12.28     B5 9 0
29 Cl Berkeley 94 OpC 22 22 49.3 +55 51 46   9.10 8.7     ~ 50 0
30 LS III +55 58 * 22 22 50.3656880304 +55 51 38.443900284 12.09 12.54 12.14     O6 14 0
31 LS III +55 59 * 22 22 51.6721888392 +55 52 30.831377592 11.61 12.05 11.59     OB- 17 0
32 BD+55 2736 * 22 22 52.670904 +55 52 12.80028 9.51 10.070 9.641 9.638   B 15 0
33 Cl Berkeley 94 13 * 22 22 56.4694690896 +55 54 11.652127272   11.35 9.93     G8III 7 0
34 LF 4 +55 293 * 22 22 57.5899346832 +55 52 51.144703284 9.88 10.37 10.22     B0 19 0
35 HD 239944 * 22 23 20.3828112480 +56 36 31.628143440   10.03 9.44     F8 7 0
36 NAME SBB 4 OpC 22 23 24.30 +56 36 27.0           ~ 5 0
37 Ass Cep OB 1 As* 22 29 +56.6           ~ 91 0

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