2012A&A...547A.107S


Query : 2012A&A...547A.107S

2012A&A...547A.107S - Astronomy and Astrophysics, volume 547A, 107-107 (2012/11-1)

Characterisation of young stellar clusters.

SANTOS-SILVA T. and GREGORIO-HETEM J.

Abstract (from CDS):

Several embedded clusters are found in the Galaxy. Depending on the formation scenario, most of them can evolve to unbounded groups that are dissolved within 10Myr to 20Myr. A systematic study of young stellar clusters that show distinct characteristics provides interesting information on the evolutionary phases during the pre-main sequence. To identify and to understand these phases we performed a comparative study of 21 young stellar clusters. Near-infrared data from 2MASS were used to determine the structural and fundamental parameters based on surface stellar density maps, radial density profile, and colour-magnitude diagrams. The cluster members were selected according to their membership probability, which is based on the statistical comparison with the cluster proper motion. Additional members were selected on the basis of a decontamination procedure that was adopted to distinguish field stars found in the direction of the cluster area. We obtained age and mass distributions by comparing pre-main sequence models with the position of cluster members in the colour-magnitude diagram. The mean age of our sample is ∼5Myr, where 57% of the objects is found in the 4-10Myr range of age, while 43% is <4Myr old. Their low E(B-V) indicate that the members are not suffering high extinction (AV<1mag), which means they are more likely young stellar groups than embedded clusters. Relations between structural and fundamental parameters were used to verify differences and similarities that could be found among the clusters. The parameters of most of the objects show the same trends or correlations. Comparisons with other young clusters show similar relations among mass, radius, and density. Our sample tends to have larger radius and lower volumetric density than embedded clusters. These differences are compatible with the mean age of our sample, which we consider intermediate between the embedded and the exposed phases of the stellar clusters evolution.

Abstract Copyright:

Journal keyword(s): open clusters and associations: general - stars: pre-main sequence - stars: fundamental parameters - infrared: stars

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1284 1
2 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 119 0
3 Ass Gem OB 1 As* 06 09.8 +21 35           ~ 175 0
4 NGC 2244 OpC 06 31 55 +04 56.5           ~ 579 1
5 NAME Mon I MoC 06 35 +10.1           ~ 224 0
6 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1642 0
7 NGC 2282 RNe 06 46 51 +01 18.9   10       ~ 44 2
8 NGC 2302 OpC 06 51.9 -07 05           ~ 43 0
9 [BDS2003] 96 OpC 07 05 18 -12 19.7           ~ 16 0
10 NAME CMa R1 As* 07 08 21.3 -11 04 50           ~ 78 1
11 NGC 2362 OpC 07 18 41 -24 57.3           ~ 370 0
12 NGC 2367 OpC 07 20 06 -21 52.9           ~ 62 0
13 ESO 313-7 OpC 08 37 40 -39 34.8   10.36 9.9     ~ 29 0
14 NGC 2645 OpC 08 39 03 -46 14.0           ~ 57 0
15 NGC 2659 OpC 08 42.6 -44 59           ~ 27 0
16 ESO 313-13 OpC 08 44 51 -41 14.0   7.01 6.7     ~ 58 0
17 Cl Collinder 205 OpC 09 00 32 -48 59.0           ~ 49 0
18 Cl Ruprecht 79 OpC 09 41 03.0 -53 50 53           ~ 69 0
19 Cl Ruprecht 83 OpC 09 49 19 -54 36.7   10.26 9.8     ~ 18 0
20 NGC 3572 OpC 11 10 23 -60 14.9           ~ 79 0
21 Cl Hogg 10 OpC 11 10 44 -60 23.1           ~ 43 0
22 Cl Trumpler 18 OpC 11 11 28 -60 40.0           ~ 81 0
23 NGC 3590 OpC 11 12 59 -60 47.3           ~ 72 0
24 Cl Stock 13 OpC 11 13 05 -58 53.0           ~ 45 0
25 Mrk 38 PaG 11 18 17.069 +53 44 59.51   15.2       ~ 39 0
26 NGC 4755 OpC 12 53 39 -60 21.7           ~ 270 0
27 Cl Stock 16 OpC 13 19 29 -62 38.0           ~ 86 0
28 NGC 5606 OpC 14 27 47 -59 38.4           ~ 92 0
29 NGC 6178 OpC 16 35 47 -45 38.6   7.28 7.2     ~ 60 0
30 Cl Hogg 22 OpC 16 46 37 -47 05.0           ~ 64 0
31 Cl Lynga 14 OpC 16 55 00 -45 14.4           ~ 40 0
32 Cl Trumpler 28 OpC 17 37 00 -32 29.0           ~ 43 0
33 Cl Mrk 38 OpC 18 15 17 -19 00.0           ~ 31 0
34 NGC 6604 OpC 18 18 03 -12 14.5           ~ 124 0
35 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 971 2
36 M 18 OpC 18 19 58 -17 06.1           ~ 76 0
37 NGC 6823 OpC 19 43 09 +23 18.0   7.71 7.1     ~ 254 2
38 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 422 2
39 IC 1396 OpC 21 39 00 +57 29.4           ~ 453 1
40 Ass Gem OB 4 As* ~ ~           ~ 5 0

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2021.10.20-00:41:33

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