2008A&A...485...81B

Query : 2008A&A...485...81B

2008A&A...485...81B - Astronomy and Astrophysics, volume 48581-93 (2008/7-1)

Exploring FSR open cluster candidates within |Δl|=20° of the Galactic anticentre.

BONATTO C. and BICA E.

Abstract (from CDS):

We investigate the nature of a sample of star cluster candidates detected as stellar overdensities towards the Galactic anticentre. Taken from the catalogue of Froebrich, Scholz, and Raftery (FSR, 2007MNRAS.374..399F), the sample contains 28 star cluster candidates located within |Δl|=20° of the anticentre. These are all the candidates in that sector classified by FSR with a high probability of being star clusters. Our main goals are to determine the fraction of such candidates that are unknown star clusters, to derive their astrophysical parameters, and to investigate the relationship of cluster parameters with position in the Galaxy. Properties of the star cluster candidates are investigated with field-star decontaminated 2MASS colour-magnitude diagrams and stellar radial density profiles. All candidates present significant excesses in the radial density profiles, consistent with the method from which they were originally selected. Of the 28 candidates, 7 are previously known open clusters, 2 have been recently identified, and 6 are new ones with ages from 30Myr to 1Gyr. Among the remaining 13 candidates, 6 are uncertain cases that require deeper observations, while 7 appear to be important field fluctuations. The structure of part of the newly identified open clusters appears to be affected by interaction with giant molecular clouds in the Local and Perseus arms. When photometric and radial distribution properties are considered together, an important fraction of the stellar overdensities with a fluctuation level >3σ are shown to be star clusters. Thus, catalogues of star cluster candidates, coupled to the present kind of study, are an important source for identifying unknown open clusters. Such efforts affect the understanding of the star-formation rate, cluster dynamical evolution, and Galactic structure, among others.

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Journal keyword(s): Galaxy: open clusters and associations: general - Galaxy: structure

Simbad objects: 55

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Number of rows : 55
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 [FSR2007] 0584 OpC 02 27 15.0 +61 37 28           ~ 23 0
3 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
4 [FSR2007] 0756 OpC 04 24 16.0 +29 43 31           ~ 11 0
5 [FSR2007] 0773 Cl* 04 29 40.0 +26 01 04           ~ 6 0
6 [FSR2007] 0801 Cl* 04 46 57.0 +24 53 16           ~ 2 0
7 [FSR2007] 0744 OpC 04 59 30.0 +38 00 42           ~ 12 0
8 [FSR2007] 0841 OpC 05 06 18.0 +21 31 00           ~ 6 0
9 NGC 1798 OpC 05 11 39.3 +47 41 28           ~ 85 0
10 [FSR2007] 0851 OpC 05 14 39.0 +19 48 01           ~ 11 0
11 Cl Berkeley 69 OpC 05 24 21.1 +32 36 13           ~ 50 0
12 NGC 1883 OpC 05 25 53.9 +46 29 14     12.0     ~ 52 0
13 [FSR2007] 0882 OpC 05 27 54.0 +16 54 32           ~ 8 0
14 [FSR2007] 0884 OpC 05 32 21.0 +17 11 02           ~ 6 0
15 [FSR2007] 0814 OpC 05 36 51.4 +31 13 12           ~ 38 0
16 Cl Berkeley 71 OpC 05 40 56.7 +32 16 11           ~ 49 0
17 [FSR2007] 0855 Cl* 05 42 22.0 +22 49 34           ~ 2 0
18 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
19 Cl Czernik 23 OpC 05 50 06.2 +28 53 45           ~ 42 0
20 NGC 2126 OpC 06 02 36.9 +49 53 26           ~ 51 0
21 [FSR2007] 0894 OpC 06 04 05.0 +20 16 51           ~ 7 0
22 [FSR2007] 0932 OpC 06 04 22.1 +14 34 19           ~ 23 0
23 [FSR2007] 0942 OpC 06 05 58.6 +13 40 15           ~ 34 0
24 [FSR2007] 0776 Cl* 06 07 28.0 +39 50 23           ~ 2 0
25 [FSR2007] 0869 OpC 06 10 01.2 +24 33 37           ~ 30 0
26 [FSR2007] 0923 OpC 06 10 36.1 +16 58 11           ~ 25 0
27 [FSR2007] 0956 OpC 06 12 25.0 +13 00 26           ~ 9 0
28 [FSR2007] 0927 OpC 06 24 10.0 +18 01 30           ~ 8 0
29 [FSR2007] 0911 Cl* 06 25 03.0 +19 53 00           ~ 6 1
30 Cl Bochum 1 OpC 06 25 18 +19 46.8   8.08 7.9     ~ 52 1
31 [FSR2007] 0948 OpC 06 25 56.7 +15 51 35           ~ 24 0
32 [FSR2007] 0974 OpC 06 32 37.1 +12 33 36           ~ 24 0
33 Cl Berkeley 23 OpC 06 33 15.6 +20 32 09           ~ 41 0
34 NGC 2477 OpC 07 52 11.4 -38 32 47   6.64 5.8     ~ 314 0
35 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
36 Cl Ruprecht 101 OpC 12 09 33.8 -62 59 36           ~ 30 0
37 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
38 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
39 Cl Harvard 8 OpC 13 18 10.3 -67 04 24   10.01 9.5     ~ 44 0
40 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 581 1
41 ESO 275-1 OpC 15 55 07.9 -46 00 30           ~ 31 0
42 NAME Nor Arm PoG 16 00 -50.0           ~ 485 0
43 [FSR2007] 1744 OpC 16 51 36.0 -42 24 55           ~ 16 0
44 NAME 2MASS-GC03 GlC 16 52 10.602 -47 03 29.00           ~ 68 0
45 [FSR2007] 1755 OpC 17 12 20.0 -38 27 44           ~ 10 0
46 SH 2-3 HII 17 12.4 -38 28           ~ 234 1
47 NAME 2MASS-GC04 OpC 17 35 44.8 -36 21 42           ~ 34 0
48 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
49 [FSR2007] 0031 OpC 18 06 29.0 -21 22 33           ~ 20 0
50 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
51 [FSR2007] 0089 OpC 18 48 39.0 -03 30 34           ~ 20 0
52 [FSR2007] 0190 OpC 20 05 31.3 +33 34 09           ~ 25 0
53 NAME Outer Arm PoG 21 48 +69.4           ~ 370 0
54 NAME Local Arm reg ~ ~           ~ 649 0
55 NAME Galactic Bar reg ~ ~           ~ 1458 0

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