2010A&A...521A..74B


Query : 2010A&A...521A..74B

2010A&A...521A..74B - Astronomy and Astrophysics, volume 521, A74-74 (2010/10-1)

The wide variety of evolutionary stages among 34 unstudied Teutsch open clusters.

BONATTO C. and BICA E.

Abstract (from CDS):

Close investigations of unstudied open-cluster candidates may improve the statistics of objects undergoing the dissolution phase. We plan to settle the nature and derive astrophysical (fundamental, structural, and stellar mass content) parameters for 34 unstudied open cluster candidates from the near-infrared Teutsch list. The analysis employs 2MASS photometry, field-star decontamination (to enhance the intrinsic colour-magnitude diagram morphology), and colour-magnitude filters (for high contrast in stellar radial density profiles). We find 8 clusters younger than ∼30Myr, 21 with ages within 100-900Myr, 3 older than 1Gyr, and possibly 1 as old as ∼7Gyr. Part of the sample is affected by reddening as high as AV∼9, and about half is located more than d∼3kpc away from the Sun, with a few reaching d=6-9kpc. The sample contains essentially low-luminosity clusters in the optical, with <MV≥~-3±3. These properties are consistent with their near-infrared origin. Cluster size increases both with Galactocentric distance and height over the plane, which is consistent with the low level of tidal stress (and field contamination) associated with these regions. The average mass density falls off with cluster radius as ρ∼R–3, which in clusters younger than ∼20Myr and more massive than ∼103M has been interpreted as diffusion-related cluster expansion. Besides the derivation of astrophysical parameters for a sample of unstudied open clusters, in this paper we identify a set of clusters older than several 102Myr, with 4 of them having survived a few Gyr. Surveys of open cluster candidates should be further explored to fill in the gap between the detected and predicted number of clusters. An improved statistic, especially on the population of clusters in highly evolved phases, can be used to investigate cluster formation rates and constrain the dissolution-time scale in the Galaxy.

Abstract Copyright:

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

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 DSH J0229.1+6206 OpC 02 29 08.2 +62 06 19           ~ 8 1
2 DSH J0247.7+6158 OpC 02 47 42.3 +61 58 29   13.09 12.68     ~ 8 1
3 NAME Per Arm PoG 03 30 +45.0           ~ 1396 0
4 DSH J0510.0+3849 OpC 05 10 00.7 +38 49 14           ~ 8 1
5 DSH J0530.3+3813 OpC 05 30 18.3 +38 13 51           ~ 12 0
6 DSH J0541.3+3914 OpC 05 41 21.8 +39 14 26           ~ 14 0
7 DSH J0542.7+3057A OpC 05 42 45.9 +30 57 33           ~ 9 1
8 DSH J0544.3+2848 OpC 05 44 23.0 +28 48 23           ~ 17 0
9 DSH J0625.4+1351 OpC 06 25 24.4 +13 51 59           ~ 14 0
10 DSH J0625.6+1336 OpC 06 25 40.3 +13 36 25           ~ 15 0
11 DSH J0643.9+0124 OpC 06 43 55.0 +01 24 09           ~ 11 0
12 DSH J0718.4-1734 OpC 07 18 26.8 -17 34 40           ~ 12 0
13 DSH J0807.1-3603 OpC 08 07 08.1 -36 03 48           ~ 9 0
14 DSH J0832.5-4159 OpC 08 32 30.6 -41 59 32           ~ 8 0
15 DSH J0920.5-5251 OpC 09 20 31.8 -52 51 06           ~ 7 0
16 DSH J0933.4-5223 OpC 09 33 28.6 -52 23 10           ~ 10 1
17 DSH J1021.4-5427 OpC 10 21 24.4 -54 27 03           ~ 11 0
18 DSH J1052.8-5927 OpC 10 52 50.1 -59 27 53           ~ 12 0
19 DSH J1059.3-5932 OpC 10 59 22.6 -59 32 40           ~ 12 1
20 NGC 3960 OpC 11 50 35 -55 40.7   9.07 8.3     ~ 123 0
21 DSH J1153.2-6236 OpC 11 53 15.5 -62 36 32           ~ 10 1
22 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 296 0
23 Teutsch 79 OpC 13 23 38.8 -63 40 10           ~ 8 0
24 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 467 1
25 NAME Nor Arm PoG 16 00 -50.0           ~ 384 0
26 Teutsch 85 OpC 17 13 13.8 -39 42 22           ~ 16 0
27 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
28 Teutsch 14a OpC 18 03 31.3 -22 07 32           ~ 13 1
29 DSH J1929.2+2318 OpC 19 29 16.9 +23 18 18           ~ 6 1
30 Teutsch 27 OpC 19 37 23.2 +18 41 50           ~ 10 1
31 DSH J1942.7+2951 OpC 19 42 46.9 +29 51 20           ~ 6 0
32 DSH J1947.7+2415 OpC 19 47 42.4 +24 15 45           ~ 15 0
33 NAME Ori-Cyg Arm reg 20 00 +35.0           ~ 44 0
34 DSH J2018.3+3112 OpC 20 18 21.2 +31 12 44           ~ 6 1
35 DSH J2028.2+3506 OpC 20 28 16.5 +35 06 50           ~ 8 0
36 [LK2002] Cl10 OpC 20 39 13 +39 58.6           ~ 5 0
37 DSH J2121.7+5036 OpC 21 21 43.9 +50 36 36           ~ 13 0
38 NAME Outer Arm PoG 21 48 +69.4           ~ 271 0
39 DSH J2213.7+5543 OpC 22 13 47.0 +55 43 52           ~ 14 1
40 DSH J2224.5+6024 OpC 22 24 31.7 +60 24 53           ~ 7 0
41 DSH J2228.7+6137 OpC 22 28 44.2 +61 37 52           ~ 5 1
42 Teutsch 39 OpC 22 36 28.360 +37 45 22.49           ~ 8 0
43 DSH J2247.4+5946 OpC 22 47 24.1 +59 46 54           ~ 12 0
44 DSH J2347.9+6259 OpC 23 47 54.2 +62 59 50           ~ 12 0
45 NAME Galactic Bar reg ~ ~           ~ 1059 0

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2022.08.15-15:43:51

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