2019A&A...631A.124A

Query : 2019A&A...631A.124A

2019A&A...631A.124A - Astronomy and Astrophysics, volume 631A, 124-124 (2019/11-1)

A comprehensive study of NGC 2345, a young open cluster with a low metallicity.

ALONSO-SANTIAGO J., NEGUERUELA I., MARCO A., TABERNERO H.M., GONZALEZ-FERNANDEZ C. and CASTRO N.

Abstract (from CDS):


Context. NGC 2345 is a young open cluster that hosts seven blue and red supergiants, low metallicity, and a high fraction of Be stars, which makes it a privileged laboratory to study stellar evolution.
Aims. We aim to improve the determination of the cluster parameters and study the Be phenomenon. Our objective is also to characterise the seven evolved stars found in NGC 2345 by deriving their atmospheric parameters and chemical abundances.
Methods. We performed a complete analysis combining for the first time ubvy photometry with spectroscopy as well as the Gaia Data Release 2. We obtained spectra with classification purposes for 76 stars and high-resolution spectroscopy for an in-depth analysis of the blue and red evolved stars.
Results. We identify a new red supergiant and 145 B-type likely members within a radius of 18.7±1.2-arcmin, which implies an initial mass, Mcl~=5200M☉. We find a distance of 2.5±0.2kpc for NGC 2345, placing it at RGC=10.2±0.2kpc. Isochrone fitting supports an age of 56±13Ma, implying masses around 6.5M☉ for the supergiants. A high fraction of Be stars (~=10%) is found. From the spectral analysis we estimate an average vrad=+58.6±0.5km/s and a low metallicity, [Fe/H]=-0.28±0.07, for the cluster. We also determine chemical abundances for Li, O, Na, Mg, Si, Ca, Ti, Ni, Rb, Y, and Ba for the evolved stars. The chemical composition of the cluster is consistent with that of the Galactic thin disc. One of the K supergiants, S50, is a Li-rich star, presenting an A(Li)~=2.1. An overabundance of Ba is found, supporting the enhanced s-process.
Conclusions. NGC 2345 has a low metallicity for its Galactocentric distance, which is comparable to typical Large Magellanic Cloud stars. It is massive enough to serve as a test bed for theoretical evolutionary models for massive intermediate-mass stars.

Abstract Copyright: © ESO 2019

Journal keyword(s): open clusters and associations: individual: NGC 2345 - Hertzsprung-Russell and C-M diagrams - stars: abundances - stars: fundamental parameters - stars: late-type - stars: emission-line, Be

VizieR on-line data: <Available at CDS (J/A+A/631/A124): tablea1.dat tablea2.dat tablea3.dat tablea4.dat>

Nomenclature: Table A.1: [ANM2019] NNNN (Nos 1-2153).

Simbad objects: 90

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Number of rows : 90
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 663 OpC 01 46 21 +61 12.7   7.78 7.1     ~ 255 0
2 NGC 884 OpC 02 22 20.2 +57 08 56           ~ 486 0
3 NGC 1039 OpC 02 42 07.4 +42 43 19           ~ 431 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17460 0
5 HD 53692 * 07 05 28.3468304208 -13 21 12.424504788   9.94 9.71     B8II 4 0
6 SS 81 Em* 07 05 31.8581951856 -13 24 06.030222696   11.73 11.63     B5III 2 0
7 LS 153 * 07 05 37.1484850488 -13 46 33.157918056 11.65 12.20 11.72 11.62   B0.7III 10 0
8 LS 152 * 07 05 37.5406848792 -13 31 24.080697372 10.83 11.38 11.10 11.09   B2IV 7 0
9 SS 82 Em* 07 05 46.0716185352 -13 09 37.142642952   11.87 11.42     B0.5e 3 0
10 LS 164 * 07 06 13.5667879824 -13 11 09.125180916 12.29 12.77 12.19 12.09   O8V((f))z 6 0
11 LS 165 * 07 06 25.2200018712 -13 48 01.641777228 11.49 12.00 11.50 11.39   B0.7III 7 0
12 LS 170 * 07 06 51.6187742424 -13 17 15.740046960 12.82 12.30 11.41 11.15   B9Ib 7 0
13 LS 171 * 07 06 56.3938305384 -12 46 28.366997520   12.74 12.34 12.28   B1.5Ve 7 0
14 UCAC4 386-024040 * 07 07 09.1491800500 -12 58 43.798430204   13.179 12.765 12.713   A2III 1 0
15 UCAC4 384-024729 * 07 07 12.9281561972 -13 12 59.470977956   15.268 14.653 14.515   A1V 1 0
16 UCAC4 386-024072 * 07 07 14.2517497084 -12 58 47.716788892   13.640 13.129 12.994   B9.5II-III 1 0
17 LS 174 * 07 07 15.1289709432 -13 39 35.094884364   13.07 12.76 12.78   B2Ve 5 0
18 UCAC4 384-024791 * 07 07 25.2216462257 -13 17 43.714477871   12.847 12.494 12.461   AIII 1 0
19 UCAC4 384-024872 * 07 07 36.4119934874 -13 15 51.826581172   13.545 13.122 13.166   B8III 1 0
20 LS 176 * 07 07 49.2916218192 -12 47 16.586264076 11.33 11.55 11.13 11.22   B3IIIe 6 0
21 SS 86 Em* 07 07 51.5149875720 -13 04 34.585838184   13.250 12.683 12.568   B5Ve 5 0
22 IRAS 07055-1302 s*r 07 07 55.7942965776 -13 07 42.252724164   14.00 11.53 10.74   K4-5Ib 2 0
23 LS 178 * 07 07 57.2124614064 -13 03 31.746278628 12.24 12.92 12.44 12.36   B3IV 10 0
24 UCAC4 385-024661 * 07 07 57.6734273064 -13 09 40.987068804   13.904 13.266 13.114   B3V 4 0
25 NGC 2345 4 * 07 08 01.7484314856 -13 13 43.068942120   12.69 12.17     B4III 5 0
26 TYC 5393-766-1 * 07 08 02.5506203703 -13 26 10.629875412   12.36 11.86     B3V 1 0
27 LS 179 * 07 08 06.0600485664 -13 11 10.298110344 12.16 12.82 12.10 11.96   B4III 11 0
28 NGC 2345 23 * 07 08 06.9614034528 -13 09 40.945215888   14.22 13.50     B3V 5 0
29 LS 180 * 07 08 07.0399985040 -12 48 19.253406276 12.87 13.11 12.70 12.64   B5V 8 0
30 NGC 2345 5 Be* 07 08 07.5724015944 -13 13 22.112717484   13.96 13.42     B5Ve 7 0
31 NGC 2345 2 Be* 07 08 10.4983706160 -13 15 36.766051848   12.40 11.96 11.90   B5Ve 7 0
32 NGC 2345 24 Be* 07 08 11.6221399080 -13 09 26.938896624   14.98 13.98     B3Ve 8 0
33 NGC 2345 6 * 07 08 12.3338154216 -13 13 46.604411508   13.90 13.44     B6V 5 0
34 NGC 2345 20 Be* 07 08 12.5103687072 -13 10 37.476263100   14.59 13.90     B3Ve 7 0
35 NGC 2345 25 * 07 08 14.3298911376 -13 10 11.500098960   14.23 13.55     B3V 5 0
36 HD 54411 * 07 08 14.4211234056 -13 16 07.170753900 9.66 9.75 9.43 9.57   A2II 18 0
37 BD-13 1839 * 07 08 15.4611548976 -13 13 46.992351036 10.57 10.64 9.92 9.93   A3Ib 13 0
38 LS 187 * 07 08 16.7818039848 -13 09 56.660186952 12.38 13.00 12.38 12.31   B3IV 10 0
39 NGC 2345 14 * 07 08 17.4623355624 -13 11 30.485397912   12.79 10.73     K2II 7 0
40 NGC 2345 OpC 07 08 18.0 -13 11 56   8.58 7.7     ~ 79 0
41 NGC 2345 30 * 07 08 19.3073938872 -13 07 00.930520236   14.34 13.74     B7IIIe 5 0
42 TYC 5389-2824-1 * 07 08 19.4587866816 -12 58 49.310783220   12.24 12.15     FV: 1 0
43 NGC 2345 32 Be* 07 08 19.5319370040 -13 09 42.453085212   14.47 13.86     B5Ve 7 0
44 BD-12 1805 V* 07 08 21.8535089832 -13 10 23.271145608   11.44 9.94     G6II+B 19 0
45 LS 190 Be* 07 08 22.8575510928 -13 10 18.774271092 10.78 11.56 11.02 10.91   B2Ve 15 0
46 NGC 2345 54 * 07 08 24.7307270688 -13 13 45.802392348   13.33 12.86     B5V 5 0
47 NGC 2345 44 Be* 07 08 25.5062803608 -13 12 02.373932448   13.72 13.32     B3Ve 7 0
48 UCAC4 385-024849 * 07 08 25.8717299014 -13 00 17.104389786   12.631 12.295 12.518   A0V 1 0
49 NGC 2345 56 * 07 08 26.0844420288 -13 14 24.373906620   13.99 13.50     B6V 4 0
50 NGC 2345 43 * 07 08 26.3197214208 -13 11 14.441334900   12.51 10.70     K0Ib-II 12 0
51 NGC 2345 51 * 07 08 26.4455882341 -13 12 37.122066182   12.82 12.37 12.390   B3IV 4 0
52 2MASS J07082701-1312329 s*r 07 08 27.0114912696 -13 12 32.987110284   12.44 10.40     K4Ib 11 0
53 NGC 2345 59 Be* 07 08 28.0347737328 -13 15 35.283090708   13.44 13.05     B3Ve 8 0
54 NGC 2345 47 * 07 08 29.2825020696 -13 12 45.354139596   13.06 12.61     B4V 2 0
55 NGC 2345 61 Be* 07 08 29.9477395632 -13 13 15.249475344   13.79 13.36     B5Ve 7 0
56 NGC 2345 60 * 07 08 30.3703598472 -13 13 52.554084492   12.30 10.48     K2Ib-II 11 0
57 NGC 2345 37 * 07 08 31.9463109744 -13 10 11.789297616   13.02 12.69     B3IV 5 0
58 TYC 5389-2512-1 * 07 08 32.7611515752 -12 59 10.629278196   11.37 11.01     earlyF 1 0
59 NGC 2345 39 * 07 08 33.6906138048 -13 10 57.920798352   13.30 12.92     B5IV 5 0
60 NGC 2345 36 * 07 08 35.6378624856 -13 09 57.882204000   10.41 10.26     A2V 4 0
61 HD 54515 ** 07 08 35.89920 -13 59 22.6572           B5IIIshell 6 0
62 LS 193 * 07 08 58.2920295504 -13 25 56.182783224   12.70 12.34 12.34   B3IV 8 0
63 UCAC4 386-024645 * 07 09 02.7406950749 -12 57 41.417070091   13.640 13.257 13.279   A3V 1 0
64 UCAC4 386-024670 * 07 09 09.3207950364 -12 57 45.654604519   13.518 12.954 12.899   AIII 1 0
65 LS 195 Em* 07 09 10.6978299192 -13 10 52.078032552 12.26 12.96 12.37 12.26   B5Ve 12 0
66 ASAS J070911-1217.2 cC* 07 09 10.7989573824 -12 17 09.182503536   11.544 10.603   9.474 ~ 7 0
67 IRAS 07068-1321 Mi* 07 09 11.2897523496 -13 26 04.907729940           M6II 6 0
68 UCAC4 386-024686 * 07 09 13.9297283213 -12 56 31.745617252   14.474 13.833 13.736   earlyA 1 0
69 V* TV CMa cC* 07 09 15.4111686768 -13 47 09.918759588   11.58 10.59     F5 85 0
70 UCAC4 385-025163 * 07 09 18.5746307326 -13 02 33.337801447   12.743 12.450 12.480   A5V 1 0
71 HD 54727 * 07 09 25.4142093528 -12 32 30.938520156 9.62 10.19 9.88 9.93   B1Ib/II 14 0
72 TYC 5402-1644-1 * 07 09 25.4321114640 -12 55 34.711030704   12.52 12.70     B5V 1 0
73 HD 54743 * 07 09 29.6019054600 -13 10 33.625846056   10.13 9.36     G5III 5 0
74 UCAC4 385-025196 * 07 09 30.0231497907 -13 07 40.156242557   12.092 11.698 11.675   A7II-III 1 0
75 TYC 5402-1692-1 * 07 09 32.4974405736 -13 04 37.055836776   11.69 11.10     A0III 1 0
76 TYC 5402-1851-1 * 07 09 44.4657930432 -13 03 44.472298356   13.03 10.66     ~ 2 0
77 HD 54859 SB* 07 09 57.0100155576 -13 36 57.843473292   8.22 7.17     G8II 12 0
78 TYC 5406-531-1 * 07 09 57.4298186592 -13 30 10.186202664   12.85 12.46 12.46   B3III 7 0
79 TYC 5406-46-1 * 07 09 59.6683158864 -13 12 38.438966196   13.36 11.32     ~ 1 0
80 HD 54932 * 07 10 18.1934315688 -12 42 12.113875152   10.03 9.94     B3V 5 1
81 HD 54955 Pu* 07 10 24.4819637804 -13 33 52.121118074   9.99 9.92 10.073   A: 4 0
82 TYC 5402-1311-1 * 07 10 35.2706557320 -13 03 11.926245240   12.52 11.99 11.92   OB- 6 0
83 UCAC4 383-026403 * 07 10 59.6755799304 -13 31 34.423649868   13.22 12.77 12.66   OB 7 0
84 LS 224 * 07 11 14.5004468184 -13 30 41.540632524   13.14 12.65 13.01   OB 6 0
85 TYC 5402-389-1 * 07 11 32.5368117624 -12 50 39.405664176   11.73 11.36 11.34   B2.5III 6 0
86 NGC 3105 OpC 10 00 40.6 -54 47 24   10.73 9.7     ~ 40 0
87 NGC 6067 OpC 16 13 11.8 -54 13 37           ~ 211 0
88 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14436 0
89 Cl Berkeley 51 OpC 20 11 53.3 +34 24 07           ~ 25 0
90 NGC 7419 OpC 22 54 19.0 +60 48 50     13.0     ~ 106 0

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