2014A&A...568A..16L

Query : 2014A&A...568A..16L

2014A&A...568A..16L - Astronomy and Astrophysics, volume 568A16-16 (2014/8-1)

Probing embedded star clusters in the HII complex NGC 6357 with VVV.

LIMA E.F., BICA E., BONATTO C. and SAITO R.K.

Abstract (from CDS):

NGC6357 is an active star-forming region located in the Sagittarius arm that displays several star clusters, which makes it a very interesting target to investigate star formation and early cluster evolution. We explore NGC6357 with the VISTA Variables in the Via Lactea (VVV) photometry of seven embedded clusters (ECs), and one open cluster projected in the outskirts of the complex. Photometric and structural properties (age, reddening, distance, core, and total radii) of the star clusters were derived. VVV saturated stars were replaced by their 2MASS counterparts. Field-decontaminated VVV photometry was used to analyse colour-magnitude diagrams (CMDs) and stellar radial density profiles and determine astrophysical parameters. We report the discovery of four ECs and one intermediate-age cluster in the complex area. We derive a revised distance estimate for NGC6357 of 1.78±0.1kpc based on the cluster CMD morphologies. Of the ECs, one contains the binary star WR93, while the remaining ones are dominated by pre-main sequence stars, young stellar objects, and/or and have a developed main sequence. These features reflect a significant age spread among the clusters. Evidence is found that the relatively populous cluster Pismis24 hosts two subclusters.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: general - open clusters and associations: individual: NGC6357 - instrumentation: adaptive optics

Nomenclature: Figs 1-2, Table 1: VVV CLNNN (Nos CL164-CL167).

CDS comments: Paragraph 2. G353.12+0.86 not identified, may be GAL 353.1+0.6 or GAL 353.2+0.9.

Simbad objects: 38

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Number of rows : 38
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 NGC 1931 OpC 05 31 23 +34 14.0     10.1     ~ 136 0
5 [HS66] 367 As* 05 37 03.767 -66 22 02.69           ~ 47 0
6 Cl Bochum 1 OpC 06 25 18 +19 46.8   8.08 7.9     ~ 52 1
7 Cl VDB 80 OpC 06 31 05.3 -09 36 35           ~ 26 1
8 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
9 Cl VDB 92 OpC 07 04 11.3 -11 27 06           ~ 43 1
10 [BDS2003] 96 OpC 07 05 20.3 -12 19 38           ~ 32 0
11 Cl Pismis 5 OpC 08 37 37.1 -39 35 23           ~ 48 0
12 ESO 313-13 OpC 08 44 51.8 -41 17 02   7.01 6.7     ~ 95 0
13 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
14 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
15 NGC 6055 LIN 16 05 32.5607401992 +18 09 34.374240468   15.4       ~ 47 0
16 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
17 VVV CL164 Cl* 17 24 31.0 -34 13 15           ~ 2 0
18 Cl Pismis 24 OpC 17 24 43.0 -34 12 23           ~ 130 0
19 HD 319718 ** 17 24 43.490 -34 11 57.03 12.28 11.94 10.44 10.05   O3.5If* 92 0
20 HD 319718B Y*O 17 24 43.490 -34 11 57.00           ~ 10 1
21 HD 319718A SB* 17 24 43.50 -34 11 56.8           ~ 11 1
22 NGC 6357 OpC 17 24 44 -34 12.2           ~ 303 0
23 Cl Pismis 24 17 Y*O 17 24 44.7309068928 -34 12 02.698328196 13.61 13.33 11.84 11.35 9.61 O3.5III(f*) 47 0
24 VVV CL165 Cl* 17 24 45.0 -34 11 28           ~ 1 0
25 VVV CL166 Cl* 17 24 47.0 -34 12 36           ~ 2 0
26 GAL 353.19+00.91 HII 17 24 48 -34 10.8           ~ 26 0
27 HD 157504 WR* 17 25 08.8532916336 -34 11 12.498318168 12.80 12.10 10.68 10.39 11.546 WC7+O7-9 121 0
28 VVV CL167 Cl* 17 25 09.0 -34 11 13           ~ 2 0
29 NAME AH03 J1725-34.4 OpC 17 25 32.0 -34 24 20           ~ 15 0
30 GAL 353.1+00.6 HII 17 25 37 -34 22.5           ~ 21 0
31 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
32 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
33 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
34 NGC 6823 OpC 19 43 11.3 +23 18 32   7.71 7.1     ~ 279 2
35 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
36 LBN 102.79-00.92 HII 22 19 09.0 +56 04 45           ~ 109 0
37 IRAS 22172+5549 Y*O 22 19 09.14787 +56 05 00.0380           ~ 105 0
38 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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