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


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:45:40

2014A&A...568A..16L - Astronomy and Astrophysics, volume 568A, 16-16 (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: 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 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
4 NGC 1931 BNe 05 31 23 +34 14.0     10.1     ~ 114 0
5 [HS66] 367 As* 05 37 03.767 -66 22 02.69           ~ 43 0
6 C 0622+198 OpC 06 25 18 +19 46.8   8.08 7.9     ~ 45 1
7 C 0628-096 OpC 06 30 46 -09 40.2           ~ 12 1
8 NGC 2244 OpC 06 31 55 +04 56.5   5.26 4.8     ~ 563 4
9 C 0701-114 OpC 07 03 54 -11 32.0           ~ 26 1
10 [BDS2003] 96 OpC 07 05 18 -12 19.7           ~ 14 0
11 ESO 313-7 OpC 08 37 40 -39 34.8   10.36 9.9     ~ 28 0
12 ESO 313-13 OpC 08 44 51 -41 14.0   7.01 6.7     ~ 54 0
13 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
14 NGC 4755 OpC 12 53 39 -60 21.7           ~ 268 0
15 NGC 6055 LIN 16 05 32.549 +18 09 34.80   15.4       ~ 42 0
16 NGC 6334 HII 17 20 51 -36 06.9           ~ 585 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   11.00 9.6     ~ 106 0
19 HD 319718B * 17 24 43.48 -34 11 57.2           ~ 7 1
20 HD 319718 ** 17 24 43.490 -34 11 57.03 12.28 11.94 10.44 10.05   O3.5If* 82 0
21 HD 319718A SB* 17 24 43.50 -34 11 56.8           ~ 10 1
22 Cl Pismis 24 17 * 17 24 44.7310281846 -34 12 02.700935729 13.61 13.33 11.84 11.35 9.61 O3.5III(f*) 33 0
23 VVV CL165 Cl* 17 24 45.0 -34 11 28           ~ 1 0
24 VVV CL166 Cl* 17 24 47.0 -34 12 36           ~ 2 0
25 GAL 353.19+00.91 HII 17 24 48 -34 10.8           ~ 24 0
26 HD 157504 WR* 17 25 08.8534998754 -34 11 12.502902170 12.80 12.10 10.68 10.39 11.546 WC7+O7-9 107 0
27 VVV CL167 Cl* 17 25 09.0 -34 11 13           ~ 2 0
28 NAME AH03 J1725-34.4 OpC 17 25 32.0 -34 24 20           ~ 13 0
29 GAL 353.1+00.6 HII 17 25 37 -34 22.5           ~ 15 0
30 NGC 6357 HII 17 26.5 -34 12           ~ 250 0
31 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
32 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 935 2
33 NAME Sgr Arm PoG 19 00 -30.0           ~ 523 1
34 NGC 6823 OpC 19 43 09 +23 18.0   7.71 7.1     ~ 248 2
35 IC 1396 OpC 21 39 00 +57 29.4           ~ 445 1
36 LBN 102.79-00.92 HII 22 19 09.0 +56 04 45           ~ 99 0
37 NAME Galactic Bulge reg ~ ~           ~ 3387 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:45:41

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