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


Query : 2012A&A...545A..54C

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).

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 - 2022
#notes
1 NAME Car Arm PoG 10 00 -60.0           ~ 407 1
2 NAME eta Car Cluster Cl* 10 45 03.0 -59 41 04           ~ 26 1
3 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 295 0
4 HD 113376 * 13 04 30.9673296408 -65 55 18.463914660   9.17 8.49     G3V 40 0
5 HD 114012 * 13 08 40.6167042336 -63 12 41.603462316   9.59 9.12     A0V 16 0
6 [DBS2003] 83 Cl* 13 11 14.0 -62 45 04           ~ 8 0
7 [DBS2003] 84 Cl* 13 11 17.0 -62 45 46           ~ 6 0
8 GAL 305.20+00.2 bub 13 11 35.1 -62 33 26           ~ 38 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           ~ 5 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           ~ 9 0
14 [CBC2012] Obj44 * 13 12 19.8353352240 -62 42 25.332986340     23.02     B3/4V 1 0
15 [CBC2012] Obj43 * 13 12 21.0055715232 -62 41 48.497782992     20.78     B5/6V 1 0
16 2MASS J13122225-6242381 * 13 12 22.2645480120 -62 42 38.308733316     22.05     B7/8V 1 0
17 [CBC2012] Obj41 * 13 12 22.8833003352 -62 41 48.880458384     18.64     O4-6 2 0
18 [CBC2012] Obj40 * 13 12 23.2292699362 -62 42 00.975470348     20.23     O9/B0V 3 0
19 [CBC2012] Obj39 s*b 13 12 23.7315160176 -62 42 01.276975116     17.36     O3-B3I 6 0
20 [DCT2012] D1-10 * 13 12 24.5460529776 -62 42 08.821645020     19.39     O6-8 4 0
21 WR 48-10 WR* 13 12 24.9913507440 -62 42 00.201886956     17.40     WNLh 9 0
22 [DCT2012] D1-12 * 13 12 25.6655244288 -62 42 05.440749480     19.39     B2/3V 2 0
23 2MASS J13122603-6242151 ** 13 12 26.031 -62 42 15.11     19.01     O4-6 2 0
24 [CBC2012] Obj36 * 13 12 26.1113123633 -62 41 40.048249294     20.14     B2/3V 3 0
25 [DCT2012] D1-4 s*b 13 12 26.2023904083 -62 41 57.789271432     16.95     O6-8If 4 0
26 [DCT2012] D1-6 s*b 13 12 26.2698840192 -62 42 09.648813960     16.36     O6-8If 4 0
27 [DCT2012] D1-11 * 13 12 26.3727142656 -62 42 06.095271312     18.99     O8-B3 2 0
28 [DCT2012] D1-7 * 13 12 26.8515857019 -62 41 56.646073052     18.16     O4-6 5 0
29 [CBC2012] Obj34 * 13 12 27.4536781248 -62 41 19.148390376     21.41     B2/3V 1 0
30 2MASS J13122805-6242080 * 13 12 28.0679236200 -62 42 08.121637656     19.29     B2/3V 4 0
31 WR 48-8 WR* 13 12 28.5107713440 -62 41 50.972145792     16.21     WNLh 7 0
32 WR 48-9 WR* 13 12 28.5638209632 -62 41 43.769380128     14.96     WNLh 11 0
33 Cl Danks 1 OpC 13 12 29 -62 41.9           ~ 71 0
34 2MASS J13122927-6242072 * 13 12 29.2818741168 -62 42 07.225876116     21.66     B2/3V 5 0
35 [CBC2012] Obj29 * 13 12 30.240 -62 41 29.40     20.85     B2/3V 1 0
36 [CBC2012] Obj28 * 13 12 32.7269003976 -62 42 07.822663488     20.43     B9/A0V 1 0
37 [CBC2012] Obj27 * 13 12 34.1242060734 -62 41 35.958342036     18.23     B2/3V 2 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           ~ 7 0
41 [CBC2012] Obj25 * 13 12 36.3041921376 -62 41 22.731767484     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 42.2306816520 -62 41 11.437879344     19.80     B5/6V 3 0
44 UCAC4 137-092330 ** 13 12 43.272792 -62 40 56.24508     15.636 15.548   B5/6V 1 0
45 [CBC2012] Obj21 s?y 13 12 45.2721024912 -62 40 42.135510756     18.43     G7/8I 1 0
46 2MASS J13124747-6240547 * 13 12 47.4845079240 -62 40 54.697254852     17.40     B0/1V 4 0
47 2MASS J13124809-6241134 * 13 12 48.1078747152 -62 41 13.457207184     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 50.5560961416 -62 40 22.817637408     19.54     B5/6V 3 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 51.8608474212 -62 39 56.361509313     18.75     O7/8I 3 0
53 [CBC2012] Obj13 * 13 12 52.7058823320 -62 40 54.503024952     17.93     B0/1V 4 0
54 Cl Danks 2 OpC 13 12 53 -62 40.9           ~ 65 0
55 [DCT2012] D2-8 * 13 12 54.4439149800 -62 40 45.966595044     16.80     O6-8 5 0
56 [CBC2012] Obj12 * 13 12 54.5593597464 -62 41 05.076127068     16.62     O6-8 5 0
57 [CBC2012] Obj11 * 13 12 54.9141167472 -62 41 04.295430240     18.73     ~ 4 0
58 [CBC2012] Obj10 * 13 12 56.112 -62 40 53.90     16.41     ~ 1 0
59 [DCT2012] D2-4 * 13 12 56.2751016840 -62 40 51.608824140     16.41     O8-9 2 0
60 [CBC2012] Obj8 s*b 13 12 56.4333581376 -62 40 28.224694524     14.79     O8-B3I 3 0
61 [DCT2012] D2-9 * 13 12 57.380 -62 40 01.43           O6-8 2 0
62 WR 48-2 WR* 13 12 57.7079569104 -62 40 59.889237852     17.25     WC7-8 10 0
63 [CBC2012] Obj7 * 13 12 57.7363543968 -62 40 39.828440244     17.58     ~ 3 0
64 [CBC2012] Obj5 * 13 12 58.2979495800 -62 40 37.126398432     19.60     O8-9 4 0
65 [DCT2012] D2-7 * 13 12 58.6431179544 -62 40 55.289409852     16.73     O8-9 5 0
66 [CBC2012] Obj4 * 13 12 58.930 -62 40 46.49     19.32     B8/9V 1 0
67 [CBC2012] Obj3 * 13 12 59.9737045080 -62 40 40.081301796     12.19     F8-G1 2 0
68 NAME G305 Complex SFR 13 13 -62.7           ~ 63 0
69 2MASS J13130084-6239545 * 13 13 00.8426246256 -62 39 54.534490740     17.92     B3/4V 1 0
70 TYC 8994-1180-1 * 13 13 11.3194526328 -62 41 10.592470572   12.48 12.02     B9/A0V 2 0
71 VVV CL023 OpC 13 13 13 -62 33.4           ~ 5 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 59.0300715216 -64 03 19.999348524   11.60 10.36   8.785 ~ 118 0
75 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 98 0
76 HD 119550 PM* 13 43 35.6994238125 +14 21 56.183577981   7.57   6.5   G2V 68 0
77 HD 120954 PM* 13 53 07.0588806336 -23 30 47.626964928   9.33 8.75     G1V 26 0
78 V* TW Nor cC* 16 04 55.2261513912 -51 57 12.653328096   13.67 11.17     ~ 152 0
79 VVV CL070 OpC 16 21 48.0 -51 44 11           ~ 4 0
80 NAME Galactic Bulge reg ~ ~           ~ 3848 0
81 NAME Centaurus Arm PoG ~ ~           ~ 77 0

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2022.05.28-21:07:45

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