2012A&A...545A..54C


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.25CEST01:56:01

2012A&A...545A..54C - Astronomy and Astrophysics, volume 545A, 54-54 (2012/9-1)

Massive open star clusters using the VVV survey. I. Presentation of the data and description of the approach.

CHENE A.-N., BORISSOVA J., CLARKE J.R.A., BONATTO C., MAJAESS D.J., MONI BIDIN C., SALE S.E., MAURO F., KURTEV R., BAUME G., FEINSTEIN C., IVANOV V.D., GEISLER D., CATELAN M., MINNITI D., LUCAS P., DE GRIJS R. and KUMAR M.S.N.

Abstract (from CDS):

The ESO Public Survey ``VISTA Variables in the Via Lactea'' (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks1, Danks2, RCW79, and DBS132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Wide-field, deep JHKs VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters.
Result. are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide-field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J-H)/E(H-Ks)=2.20±0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.

Abstract Copyright:

Journal keyword(s): open clusters and associations: general - infrared: stars - surveys

VizieR on-line data: <Available at CDS (J/A+A/545/A54): table2.dat table5.dat table6.dat>

Nomenclature: Table 2: [CBC2012] ObjNN (Nos 1-45). Table 5: [CBC2012] DN-NNNN N=60+29 among (Nos D1-0078 to D1-3544, D2-0007 to D2-3203). Table 6: [CBC2012] RCW79-NNNN N=36 among (Nos 0029-1399).

Status at CDS:  

Simbad objects: 81

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Number of rows : 81

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 Car Arm PoG 10 00 -60.0           ~ 376 1
2 NAME eta Car Cluster Cl* 10 45 03.0 -59 41 04           ~ 23 1
3 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 272 0
4 HD 113376 * 13 04 30.9654971910 -65 55 18.466353132   9.17 8.49     G3V 34 0
5 HD 114012 * 13 08 40.6166679687 -63 12 41.599340886   9.59 9.12     A0V 11 0
6 [DBS2003] 83 Cl* 13 11 14.0 -62 45 04           ~ 7 0
7 [DBS2003] 84 Cl* 13 11 17.0 -62 45 46           ~ 5 0
8 GAL 305.20+00.2 HII 13 11 35.1 -62 33 26           ~ 35 0
9 [DBS2003] 131 OpC 13 11 39.400 -62 33 11.55           ~ 15 0
10 VVV CL021 Cl* 13 11 51 -62 36.9           ~ 4 0
11 [DBS2003] 130 Cl* 13 11 54 -62 47.0           ~ 8 0
12 [CBC2012] Obj45 * 13 12 16.202 -62 42 10.20     21.06     B3/4V 1 0
13 [DBS2003] 132 Cl* 13 12 18 -62 42.3           ~ 8 0
14 [CBC2012] Obj44 * 13 12 19.8368132910 -62 42 25.321961219     23.02     B3/4V 1 0
15 [CBC2012] Obj43 * 13 12 21.0052814630 -62 41 48.499323632     20.78     B5/6V 1 0
16 2MASS J13122225-6242381 * 13 12 22.2663009666 -62 42 38.296270792     22.05     B7/8V 1 0
17 [CBC2012] Obj41 * 13 12 22.8822834969 -62 41 48.881581455     18.64     O4-6 2 0
18 [CBC2012] Obj40 * 13 12 23.234 -62 42 01.00     20.23     O9/B0V 1 0
19 [CBC2012] Obj39 s*b 13 12 23.7314764356 -62 42 01.283687580     17.36     O3-B3I 4 0
20 [DCT2012] D1-10 * 13 12 24.5459911950 -62 42 08.824193258     19.39     O6-8 2 0
21 [CBC2012] Obj38 WR* 13 12 24.9911257196 -62 42 00.207315157     17.40     WNLh 5 0
22 [DCT2012] D1-12 * 13 12 25.620 -62 42 05.13     19.39     B2/3V 2 0
23 [DCT2012] D1-9 * 13 12 26.031 -62 42 15.11     19.01     O4-6 2 0
24 [CBC2012] Obj36 * 13 12 26.107 -62 41 39.89     20.14     B2/3V 1 0
25 [DCT2012] D1-4 s*b 13 12 26.160 -62 41 57.50     16.95     O6-8If 2 0
26 [DCT2012] D1-6 s*b 13 12 26.2692890929 -62 42 09.653683701     16.36     O6-8If 2 0
27 [DCT2012] D1-11 * 13 12 26.320 -62 42 05.78     18.99     O8-B3 2 0
28 [DCT2012] D1-7 * 13 12 26.800 -62 41 56.36     18.16     O4-6 3 0
29 Cl Danks 1 OpC 13 12 27 -62 42.1           ~ 58 0
30 [CBC2012] Obj34 * 13 12 27.4526417245 -62 41 19.162572557     21.41     B2/3V 1 0
31 2MASS J13122805-6242080 * 13 12 28.0676932349 -62 42 08.123636125     19.29     B2/3V 2 0
32 [CBC2012] Obj32 WR* 13 12 28.5106254039 -62 41 50.973257188     16.21     WNLh 4 0
33 [CBC2012] Obj31 WR* 13 12 28.5633651618 -62 41 43.769685560     14.96     WNLh 7 0
34 2MASS J13122927-6242072 * 13 12 29.2813080974 -62 42 07.229410211     21.66     B2/3V 1 0
35 [CBC2012] Obj29 * 13 12 30.240 -62 41 29.40     20.85     B2/3V 1 0
36 [CBC2012] Obj28 * 13 12 32.7167169526 -62 42 07.816444715     20.43     B9/A0V 1 0
37 [CBC2012] Obj27 * 13 12 34.156 -62 41 36.01     18.23     B2/3V 1 0
38 GAL 305.36+00.18 HII 13 12 35.2 -62 35 35           ~ 7 0
39 [CBC2012] Obj26 * 13 12 35.290 -62 41 53.71     20.49     B9/A0V 1 0
40 VVV CL022 Cl* 13 12 36 -62 37.3           ~ 6 0
41 [CBC2012] Obj25 * 13 12 36.3034719185 -62 41 22.714540778     23.07     B9/A0V 1 0
42 [CBC2012] Obj24 * 13 12 41.286 -62 41 51.38     20.15     B3/4V 1 0
43 2MASS J13124222-6241114 * 13 12 42.2301324428 -62 41 11.437690437     19.80     B5/6V 1 0
44 [CBC2012] Obj22 * 13 12 43.375 -62 40 56.98     18.22     B5/6V 1 0
45 [CBC2012] Obj21 s?y 13 12 45.269 -62 40 42.19     18.43     G7/8I 1 0
46 2MASS J13124747-6240547 * 13 12 47.4839202568 -62 40 54.701323965     17.40     B0/1V 2 0
47 2MASS J13124809-6241134 * 13 12 48.1079390993 -62 41 13.456817958     19.88     B7/8V 1 0
48 [CBC2012] Obj18 * 13 12 49.140 -62 41 00.30     19.39     B5/6V 1 0
49 [CBC2012] Obj17 * 13 12 50.155 -62 41 01.31     18.85     B5/6V 1 0
50 2MASS J13125055-6240228 * 13 12 50.5561741659 -62 40 22.822625766     19.54     B5/6V 1 0
51 [CBC2012] Obj15 * 13 12 51.197 -62 41 02.56     19.43     B3/4V 1 0
52 [CBC2012] Obj14 s*b 13 12 51.775 -62 39 56.31     18.75     O7/8I 1 0
53 [CBC2012] Obj13 * 13 12 52.7053020522 -62 40 54.506812781     17.93     B0/1V 2 0
54 [DCT2012] D2-8 * 13 12 54.4438941366 -62 40 45.966594991     16.80     O6-8 3 0
55 [CBC2012] Obj12 * 13 12 54.5591623588 -62 41 05.077786888     16.62     O6-8 3 0
56 [CBC2012] Obj11 * 13 12 54.9138235748 -62 41 04.301425324     18.73     ~ 2 0
57 Cl Danks 2 OpC 13 12 55 -62 40.9           ~ 54 0
58 [CBC2012] Obj10 * 13 12 56.112 -62 40 53.90     16.41     ~ 1 0
59 [DCT2012] D2-4 * 13 12 56.276 -62 40 51.56     16.41     O8-9 2 0
60 [CBC2012] Obj8 s*b 13 12 56.4337328760 -62 40 28.222600850     14.79     O8-B3I 3 0
61 [DCT2012] D2-9 * 13 12 57.380 -62 40 01.43           O6-8 2 0
62 [CBC2012] Obj6 WR* 13 12 57.7075284091 -62 40 59.895867639     17.25     WC7-8 5 0
63 [CBC2012] Obj7 * 13 12 57.7362678408 -62 40 39.830140142     17.58     ~ 1 0
64 [CBC2012] Obj5 * 13 12 58.2983050583 -62 40 37.128349355     19.60     O8-9 2 0
65 [DCT2012] D2-7 * 13 12 58.560 -62 40 54.84     16.73     O8-9 3 0
66 [CBC2012] Obj4 * 13 12 58.930 -62 40 46.49     19.32     B8/9V 1 0
67 [CBC2012] Obj3 * 13 12 59.9744591899 -62 40 40.084292919     12.19     F8-G1 2 0
68 NAME G305 Complex SFR 13 13 -62.7           ~ 51 0
69 2MASS J13130084-6239545 * 13 13 00.8421847481 -62 39 54.539007754     17.92     B3/4V 1 0
70 TYC 8994-1180-1 * 13 13 11.3192771908 -62 41 10.589923989   12.48 12.02     B9/A0V 1 0
71 VVV CL023 OpC 13 13 13 -62 33.4           ~ 4 0
72 [DBS2003] 133 OpC 13 13 58 -62 24.4           ~ 6 0
73 [DBS2003] 134 Cl* 13 14 22 -62 44.7           ~ 4 0
74 V* VW Cen cC* 13 33 59.0299132697 -64 03 19.999430004   11.60 10.36   8.785 ~ 101 0
75 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 93 0
76 HD 119550 PM* 13 43 35.6995416342 +14 21 56.185575566   7.57   6.5   G2V 59 0
77 HD 120954 PM* 13 53 07.0598313357 -23 30 47.649492603   9.33 8.75     G1V 18 0
78 V* TW Nor cC* 16 04 55.2266686530 -51 57 12.652767620   13.67 11.17     ~ 139 0
79 VVV CL070 OpC 16 21 48.0 -51 44 11           ~ 4 0
80 NAME Galactic Bulge reg ~ ~           ~ 3359 0
81 NAME Centaurus Arm PoG ~ ~           ~ 71 0

    Equat.    Gal    SGal    Ecl

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2020.05.25-01:56:01

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