2016A&A...589A..69D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST09:10:57

2016A&A...589A..69D - Astronomy and Astrophysics, volume 589A, 69-69 (2016/5-1)

Probing the Dragonfish star-forming complex: the ionizing population of the young massive cluster Mercer 30.

DE LA FUENTE D., NAJARRO F., BORISSOVA J., RAMIREZ ALEGRIA S., HANSON M.M., TROMBLEY C., FIGER D.F., DAVIES B., GARCIA M., KURTEV R., URBANEJA M.A., SMITH L.C., LUCAS P.W. and HERRERO A.

Abstract (from CDS):

It has recently been claimed that the nebula, Dragonfish, is powered by a superluminous but elusive OB association. However, systematic searches in near-infrared photometric surveys have found many other cluster candidates in this region of the sky. Among these, the first confirmed young massive cluster was Mercer 30, where Wolf-Rayet stars were found.We perform a new characterization of Mercer 30 with unprecedented accuracy, combining NICMOS/HST and VVV photometric data with multi-epoch ISAAC/VLT H- and K-band spectra. Stellar parameters for most of spectroscopically observed cluster members are found through precise non-LTE atmosphere modeling with the CMFGEN code. Our spectrophotometric study for this cluster yields a new, revised distance of d=(12.4±1.7)kpc and a total of QHMc30≃6.70x1050s–1 Lyman ionizing photons. A cluster age of (4.0±0.8)Myr is found through isochrone fitting, and a total mass of (1.6±0.6)x104M is estimated, thanks to our extensive knowledge of the post-main-sequence population. As a consequence, membership of Mercer 30 to the Dragonfish star-forming complex is confirmed, allowing us to use this cluster as a probe for the whole complex, which turns out to be extremely large (∼400pc across) and located at the outer edge of the Sagittarius-Carina spiral arm (∼11kpc from the Galactic center). The Dragonfish complex hosts 19 young clusters or cluster candidates (including Mercer 30 and a new candidate presented in this work) and an estimated minimum of nine field Wolf-Rayet stars. All these contributions account for, at least 73% of the ionization of the Dragonfish nebula and leaves little or no room for the alleged superluminous OB association; alternative explanations are discussed.

Abstract Copyright: © ESO, 2016

Journal keyword(s): open clusters and associations: individual: Mercer 30 - ISM: individual objects: Dragonfish Nebula - stars: massive - stars: early-type - stars: Wolf-Rayet - infrared: stars

Nomenclature: Table 2: [DNB2016] Mc30-NNa (Nos 1-24).

Simbad objects: 71

goto Full paper

goto View the reference in ADS

Number of rows : 71

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 NGC 869/884 OpC 02 20.5 +57 08           ~ 51 0
2 NAME Car Arm PoG 10 00 -60.0           ~ 378 1
3 [BRN2015] La Serena 17 C?* 12 00 57.0 -63 04 04           ~ 2 0
4 [BRN2015] La Serena 18 C?* 12 02 21.0 -62 36 32           ~ 2 0
5 [MCM2005b] 28 Cl* 12 02 24 -62 58.1           ~ 2 0
6 [BRN2015] La Serena 19 C?* 12 02 45.0 -63 07 02           ~ 2 0
7 GAL 297.51-00.77 HII 12 03 08.5 -63 07 34           ~ 9 0
8 [MCM2005b] 29 Cl* 12 03 12 -63 07.9           ~ 2 0
9 [BRN2015] La Serena 20 C?* 12 03 16.0 -63 11 15           ~ 2 0
10 [BRN2015] La Serena 22 C?* 12 03 57.0 -63 17 08           ~ 2 0
11 GAL 297.66-00.98 HII 12 04 05.6 -63 21 46           ~ 9 1
12 Caswell H2O 297.66-00.97 Mas 12 04 09.0 -63 21 35           ~ 6 0
13 [DBS2003] 75 OpC 12 09 02 -63 15.9           ~ 5 0
14 GAL 298.19-00.78 HII 12 09 03.7 -63 15 46           ~ 10 0
15 [DBS2003] 74 Cl* 12 10 00 -62 49.9           ~ 2 0
16 [GS70] 298.2-00.3 HII 12 10 01.886 -62 50 00.46           ~ 65 1
17 MR 41 WR* 12 11 18.5515045852 -62 29 43.612232119   12.24 11.35 10.94 9.78 WR 17 0
18 NAME Dragonfish Nebula SFR 12 11 -62.9           ~ 5 0
19 2MASS J12113023-6315355 s*b 12 11 30.2260517695 -63 15 35.495593296           O6-8I 2 0
20 2MASS J12113200-6315525 s*b 12 11 32.002 -63 15 52.51           O8-9.5I 2 0
21 2MASS J12114145-6316311 * 12 11 41.4515094192 -63 16 31.092554058           O8-9.5III 2 0
22 2MASS J12114824-6314333 * 12 11 48.2398765905 -63 14 33.298312843           O6-8III 2 0
23 2MASS J12115407-6317037 WR* 12 11 54.075 -63 17 03.75           WN9 2 0
24 [BRN2015] La Serena 24 C?* 12 12 29.0 -62 49 49           ~ 2 0
25 VVV CL011 Cl* 12 12 41 -62 42.5           ~ 4 0
26 [KC97c] G298.6-00.1 HII 12 13 12.6 -62 39 39           ~ 12 0
27 [DNB2016] Mc30-4 * 12 14 22.0774563283 -62 58 59.873135692           F-G 1 0
28 [DNB2016] Mc30-16 * 12 14 26.5682432345 -62 57 57.855665062           K-M 1 0
29 [DNB2016] Mc30-15 * 12 14 27.46 -62 58 06.2           G-M 1 0
30 [DNB2016] Mc30-23 * 12 14 29.44 -62 58 58.9           G 1 0
31 [DNB2016] Mc30-20 * 12 14 30.79 -62 58 39.5           K-M 1 0
32 [DNB2016] Mc30-5 * 12 14 30.82 -62 58 53.2           O7-8IV-V 1 0
33 [DNB2016] Mc30-14 * 12 14 31.33 -62 58 42.3           O9-B3II-V 1 0
34 [DNB2016] Mc30-22 * 12 14 31.41 -62 59 01.4           O9III-V 1 0
35 [DNB2016] Mc30-1 * 12 14 31.54 -62 58 54.3           O6-7.5If+ 1 0
36 [KBG2007] 4 WR* 12 14 31.54 -62 58 54.3           WN7-8 2 0
37 [DNB2016] Mc30-2 * 12 14 31.64 -62 58 48.1           B1-4Ia+ 1 0
38 [DNB2016] Mc30-3 * 12 14 31.65 -62 58 45.1           O6If 1 0
39 [DNB2016] Mc30-6a * 12 14 31.73 -62 58 52.1           Ofpe/WN9 1 0
40 [DNB2016] Mc30-6b * 12 14 31.83 -62 58 51.8           O6If 1 0
41 [MCM2005b] 30 Cl* 12 14 32.0 -62 58 49           ~ 10 0
42 [DNB2016] Mc30-10 * 12 14 32.04 -62 58 52.2           O4I-III 1 0
43 [DNB2016] Mc30-11 * 12 14 32.10 -62 58 49.6           O5.5-6I-II 1 0
44 [DNB2016] Mc30-12 * 12 14 32.18 -62 58 46.9           O7.5-8.5III-V 1 0
45 [DNB2016] Mc30-17 * 12 14 32.19 -62 58 50.7           O8.5-B1II-V 1 0
46 [DNB2016] Mc30-18 * 12 14 32.34 -62 58 48.1           O7.5-8.5I-II 1 0
47 [DNB2016] Mc30-19 * 12 14 32.53 -62 58 42.8           O6.5-7I-III 1 0
48 [DNB2016] Mc30-13 * 12 14 32.73 -62 58 55.0           O5.5-6I-II 1 0
49 [DNB2016] Mc30-9 * 12 14 33.03 -62 58 41.9           O9-7I-III 1 0
50 [KBG2007] 2 WR* 12 14 33.09 -62 58 51.0           WN6 2 0
51 [DNB2016] Mc30-7 * 12 14 33.0923803918 -62 58 51.043557979           WN6 1 0
52 [DNB2016] Mc30-21 * 12 14 33.90 -62 58 07.9           K-M 1 0
53 2MASS J12143390-6258486 WR* 12 14 33.91 -62 58 48.7           WN7 2 0
54 [DNB2016] Mc30-8 * 12 14 33.91 -62 58 48.7           WN7 1 0
55 [HBB99] 298.837-0.347 HII 12 15 19.9 -62 55 52           ~ 8 0
56 [DBS2003] 129 OpC 12 15 24 -62 55.1           ~ 4 0
57 [MCM2005b] 31 Cl* 12 15 27 -63 01.3           ~ 2 0
58 GAL 298.87-00.43 HII 12 15 29.6 -63 01 13           ~ 8 0
59 [BRN2015] La Serena 27 C?* 12 15 57.0 -62 28 00           ~ 2 0
60 [BRN2015] La Serena 28 C?* 12 16 43.0 -62 14 26           ~ 2 0
61 HD 106797 * 12 17 06.3093124011 -65 41 34.651365063   6.073 6.054     A0V 48 0
62 G3CC 2 Cl* 12 17 24.9 -62 29 04           ~ 1 0
63 GAL 299.02+00.15 HII 12 17 27.2 -62 27 54           ~ 5 0
64 [BRN2015] La Serena 29 C?* 12 18 28.0 -62 37 17           ~ 2 0
65 [BRN2015] La Serena 30 C?* 12 19 38.0 -62 57 21           ~ 1 0
66 BRAN 386E HII 12 19 53.5 -62 55 08           ~ 25 2
67 [BRN2015] La Serena 31 C?* 12 19 54.0 -62 55 42           ~ 1 0
68 VVV CL012 Cl* 12 20 14 -62 53.1           ~ 3 0
69 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 427 1
70 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
71 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 437 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2016A&A...589A..69D and select 'bookmark this link' or equivalent in the popup menu


2020.07.05-09:10:58

© Université de Strasbourg/CNRS

    • Contact