2012MNRAS.419.1871D


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.21CET06:06:33

2012MNRAS.419.1871D - Mon. Not. R. Astron. Soc., 419, 1871-1886 (2012/January-3)

The G305 star-forming complex: the central star clusters Danks 1 and Danks 2.

DAVIES B., CLARK J.S., TROMBLEY C., FIGER D.F., NAJARRO F., CROWTHER P.A., KUDRITZKI R.-P., THOMPSON M., URQUHART J.S. and HINDSON L.

Abstract (from CDS):

The G305 H II complex (G305.4+0.1) is one of the most massive star-forming structures yet identified within the Galaxy. It is host to many massive stars at all stages of formation and evolution, from embedded molecular cores to post-main-sequence stars. Here, we present a detailed near-infrared analysis of the two central star clusters Danks 1 and Danks 2, using Hubble Space Telescope+NICMOS imaging and Very Large Telescope+ISAAC spectroscopy. We find that the spectrophotometric distance to the clusters is consistent with the kinematic distance to the G305 complex, an average of all measurements giving a distance of 3.8±0.6 kpc. From analysis of the stellar populations and the pre-main-sequence stars, we find that Danks 2 is the elder of the two clusters, with an age of 3+3_- 1_Myr. Danks 1 is clearly younger with an age of 1.5+1.5_- 0.5_Myr, and is dominated by three very luminous H-rich Wolf-Rayet stars which may have masses ≳ 100 M. The two clusters have mass functions consistent with the Salpeter slope, and total cluster masses of 8000±1500 and 3000±800 M for Danks 1 and Danks 2, respectively. Danks 1 is significantly the more compact cluster of the two, and is one of the densest clusters in the Galaxy with log (ρ/M pc–3) = 5.5+0.5_- 0.4_. In addition to the clusters, there is a population of apparently isolated Wolf-Rayet stars within the molecular cloud's cavity. Our results suggest that the star-forming history of G305 began with the formation of Danks 2, and subsequently Danks 1, with the origin of the diffuse evolved population currently uncertain. Together, the massive stars at the centre of the G305 region appear to be clearing away what is left of the natal cloud, triggering a further generation of star formation at the cloud's periphery.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: formation - stars: Wolf-Rayet - ISM: clouds - H {sc ii} regions - open clusters and associations: general - open clusters and associations: individual (Danks 1, Danks 2)

Nomenclature: Table 2: [DCT2012] DN-NN (Nos D1-1 to D1-12, D2-1 to D2-9).

Simbad objects: 74

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Number of rows : 74

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 Bol 10 GlC 00 40 31.57 +41 14 22.4 17.650 17.500 16.660 16.120 15.480 ~ 45 0
2 Bol 11 GlC 00 40 31.8758360123 +41 39 17.033202720 17.590 17.390 16.578 16.100 15.564 ~ 53 0
3 NAME NGC 869/884 OpC 02 20.5 +57 08           ~ 52 0
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1101 0
5 NAME NGC 1569 CL* A1 Cl* 04 30 48.1 +64 50 59           ~ 25 1
6 NAME NGC 1569 CL* A2 Cl* 04 30 48.11 +64 50 58.8           ~ 23 1
7 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 99 1
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15116 1
9 H88 301 Cl* 05 38 16 -69 04.0   11.18 10.89     ~ 66 0
10 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1056 2
11 CPD-69 463 s*y 05 38 51.6167474749 -69 08 07.314653596 11.93 12.45 12.014     F7Ia 80 1
12 HD 269928 WR* 05 38 57.0668705166 -69 06 05.660972436   12.02 11.94 12.00 11.58 WN6/7 121 0
13 V* V712 Car bL* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 149 1
14 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 441 0
15 Cl Trumpler 15 OpC 10 44 43 -59 22.0   7.41 7.0     ~ 181 0
16 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 906 2
17 Cl Trumpler 16 OpC 10 45 10 -59 43.0   5.35 5.0     ~ 436 0
18 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 60 0
19 NAME Sher 25 star * 11 15 07.6444076894 -61 15 17.608695337   13.63 12.27     B1.5Iab 72 1
20 NGC 3603 23 * 11 15 09.8441156734 -61 15 30.489833787 13.51 13.75 12.65     OC9.7Ia 16 0
21 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 968 1
22 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1567 0
23 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 282 0
24 HD 113457 * 13 05 02.0406989979 -64 26 29.698827538   6.632 6.628     A0V 42 0
25 [LCL2005b] G305.3+0.2 A2 * 13 11 33.88 -62 33 27.1           B0V-B1V 4 0
26 [DBS2003] 131 OpC 13 11 39.400 -62 33 11.55           ~ 15 0
27 [LCL2005b] G305.3+0.2 A3 * 13 11 39.50 -62 33 28.2           B2V-B3V 3 0
28 [LCL2005b] G305.3+0.2 A1 * 13 11 41.04 -62 32 56.8           O5V-O6V 3 0
29 WR 48-6 WR* 13 12 09.0610248187 -62 43 26.713760535           WN8-9 5 0
30 WR 48-3 WR* 13 12 21.307 -62 40 12.58       16.24   WC8 6 0
31 [CBC2012] Obj41 * 13 12 22.8822834969 -62 41 48.881581455     18.64     O4-6 2 0
32 [CBC2012] Obj39 s*b 13 12 23.7314764356 -62 42 01.283687580     17.36     O3-B3I 4 0
33 [DCT2012] D1-10 * 13 12 24.5459911950 -62 42 08.824193258     19.39     O6-8 2 0
34 WR 48-10 WR* 13 12 24.9911257196 -62 42 00.207315157     17.40     WNLh 7 0
35 WR 48-7 WR* 13 12 25.4729901990 -62 44 41.792129471           WN9 5 0
36 [DCT2012] D1-12 * 13 12 25.620 -62 42 05.13     19.39     B2/3V 2 0
37 [DCT2012] D1-9 * 13 12 26.031 -62 42 15.11     19.01     O4-6 2 0
38 [DCT2012] D1-4 s*b 13 12 26.160 -62 41 57.50     16.95     O6-8If 2 0
39 [DCT2012] D1-6 s*b 13 12 26.2692890929 -62 42 09.653683701     16.36     O6-8If 2 0
40 [DCT2012] D1-11 * 13 12 26.320 -62 42 05.78     18.99     O8-B3 2 0
41 [DCT2012] D1-7 * 13 12 26.800 -62 41 56.36     18.16     O4-6 3 0
42 Cl Danks 1 OpC 13 12 27 -62 42.1           ~ 62 0
43 WR 48-4 WR* 13 12 27.6640743889 -62 44 22.033609556       17.95   WC7 5 0
44 WR 48-8 WR* 13 12 28.5106254039 -62 41 50.973257188     16.21     WNLh 5 0
45 WR 48-9 WR* 13 12 28.5633651618 -62 41 43.769685560     14.96     WNLh 8 0
46 WR 48a WR* 13 12 39.65 -62 42 55.8           WC6 80 0
47 WR 48-5 WR* 13 12 45.3426891180 -63 05 52.011183250           WN6 3 0
48 [DCT2012] D2-8 * 13 12 54.4438941366 -62 40 45.966594991     16.80     O6-8 3 0
49 [CBC2012] Obj12 * 13 12 54.5591623588 -62 41 05.077786888     16.62     O6-8 3 0
50 Cl Danks 2 OpC 13 12 55 -62 40.9           ~ 57 0
51 [DCT2012] D2-4 * 13 12 56.276 -62 40 51.56     16.41     O8-9 2 0
52 [CBC2012] Obj8 s*b 13 12 56.4337328760 -62 40 28.222600850     14.79     O8-B3I 3 0
53 [DCT2012] D2-9 * 13 12 57.380 -62 40 01.43           O6-8 2 0
54 WR 48-2 WR* 13 12 57.7075284091 -62 40 59.895867639     17.25     WC7-8 7 0
55 [CBC2012] Obj5 * 13 12 58.2983050583 -62 40 37.128349355     19.60     O8-9 2 0
56 [DCT2012] D2-7 * 13 12 58.560 -62 40 54.84     16.73     O8-9 3 0
57 [CBC2012] Obj3 * 13 12 59.9744591899 -62 40 40.084292919     12.19     F8-G1 2 0
58 NAME G305 Complex SFR 13 13 -62.7           ~ 53 0
59 IRAS 13097-6228 * 13 13 02.0441311880 -62 45 03.321081567           WCL 3 0
60 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3867 4
61 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 483 0
62 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 195 0
63 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 489 0
64 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11927 0
65 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 647 0
66 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 459 0
67 NAME 1806-20 Star Cluster OpC 18 08 39.0 -20 24 39           ~ 33 1
68 W 33a Y*O 18 14 39.0 -17 52 03           ~ 593 0
69 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 50 0
70 W 49a SFR 19 10 15.7 +09 06 05           ~ 264 2
71 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 145 0
72 W 51 SNR 19 23 50 +14 06.0           ~ 1166 1
73 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 815 0
74 NAME Local Group GrG ~ ~           ~ 7139 0

    Equat.    Gal    SGal    Ecl

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2021.01.21-06:06:34

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