2018A&A...616A.124A


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.06CEST09:33:35

2018A&A...616A.124A - Astronomy and Astrophysics, volume 616A, 124-124 (2018/8-1)

NGC 3105: a young open cluster with low metallicity.

ALONSO-SANTIAGO J., MARCO A., NEGUERUELA I., TABERNERO H.M., CASTRO N., McBRIDE V.A. and RAJOELIMANANA A.F.

Abstract (from CDS):


Context. NGC 3105 is a young open cluster hosting blue, yellow, and red supergiants. This rare combination makes it an excellent laboratory for constraining evolutionary models of high-mass stars. It has been poorly studied, and the fundamental parameters such as its age or distance are not well defined.
Aims. We intend to characterise in an accurate way the cluster and its evolved stars, for which we derive for the first time atmospheric parameters and chemical abundances.
Methods. We performed a complete analysis combining UBVR photometry with spectroscopy. We obtained spectra with classification purposes for 14 blue stars and high-resolution spectroscopy for an in-depth analysis of the six other evolved stars.
Results. We identify 126 B-type likely members within a radius of 2.7±0.6 arcmin, which implies an initial mass, Mcl~=4100M. We find a distance of 7.2±0.7kpc for NGC 3105, placing it at RGC=10.0±1.2kpc. Isochrone fitting supports an age of 28±6Ma, implying masses around 9.5M for the supergiants. A high fraction of Be stars (~=25%) is found at the top of the main sequence down to spectral type b3. From the spectral analysis we estimate for the cluster an average νrad=+46.9±0.9km/s and a low metallicity, [Fe/H]=-0.29±0.22. We also have determined, for the first time, 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. An overabundance of Ba is found, supporting the enhanced s-process.
Conclusions. NGC 3105 has a low metallicity for its Galactocentric distance, comparable to typical LMC stars. It is a valuable spiral tracer in a very distant region of the Carina-Sagittarius spiral arm, a poorly known part of the Galaxy. As one of the few Galactic clusters containing blue, yellow, and red supergiants, it is massive enough to serve as a test bed for theoretical evolutionary models close to the boundary between intermediate- and high-mass stars.

Abstract Copyright: © ESO 2018

Journal keyword(s): open clusters and associations: individual: NGC 3105 - Hertzsprung-Russell and C-M diagrams - stars: fundamental parameters - stars: abundances - stars: late-type - stars: emission-line, Be

VizieR on-line data: <Available at CDS (J/A+A/616/A124): tablea1.dat tablea2.dat>

Nomenclature: Table A.1: [AMN2018] NNN (Nos 1-607).

Status at CDS:   All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 47

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Number of rows : 47

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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9475 1
2 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 368 0
3 NGC 457 OpC 01 19 35 +58 17.2   6.97 6.4     ~ 216 2
4 NGC 654 OpC 01 44 00 +61 53.1   7.34 6.5     ~ 179 0
5 NGC 663 OpC 01 46 09 +61 14.1   7.78 7.1     ~ 235 0
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5692 1
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14869 1
8 SA 101- reg 09 57 28.2 -00 19 39           ~ 73 0
9 NGC 3105 75 * 10 00 29.9240144554 -54 45 39.094035755 13.623 13.227 12.709 12.394   A2 3 0
10 NGC 3105 74 * 10 00 30.979618 -54 45 28.24796 14.464 14.065 13.291 12.871   F 3 0
11 NGC 3105 73 * 10 00 32.547815 -54 45 21.27997 20.020 17.279 14.849 13.285   M2III 2 0
12 NGC 3105 72 * 10 00 34.264465 -54 46 08.55029 14.680 14.976 14.024 13.247   B1.5Ve 3 0
13 NGC 3105 71 * 10 00 36.943968 -54 46 11.82477 16.745 16.753 15.925 15.409   B2IV 1 0
14 NGC 3105 33 * 10 00 37.1467682401 -54 47 39.692215438   15.15 12.57     M1Iab 5 0
15 NGC 3105 25 * 10 00 37.2313939986 -54 46 37.070142224 15.936 15.956 15.170 14.678   B2V 2 0
16 NGC 3105 34 * 10 00 38.568818 -54 47 42.49911 16.073 16.076 15.278 14.771   B2.5V 1 0
17 NGC 3105 12 * 10 00 38.8870810168 -54 47 25.561550890 15.847 15.864 15.074 14.566   B2V 2 0
18 NGC 3105 14 * 10 00 39.9173993196 -54 47 16.071925835 14.578 14.32 13.797 13.268   B3III 4 0
19 NGC 3105 22 * 10 00 40.229919 -54 46 37.97629 16.139 15.661 14.791 14.329   K0V 4 0
20 NGC 3105 16 * 10 00 40.7629660060 -54 47 14.741320731 16.056 15.996 15.188 14.673   B2.5V 2 0
21 NGC 3105 37 * 10 00 41.206611 -54 47 53.34515 13.655 13.710 13.476 13.327   B9V 4 0
22 NGC 3105 9 * 10 00 41.2336483975 -54 47 36.620692327 18.330 15.664 13.295 11.889   K3Ib 4 0
23 NGC 3105 24 * 10 00 42.0186222224 -54 46 28.676445340 15.211 14.702 12.984 11.752   K3Ib+B2V: 5 0
24 WRAY 15-483 Em* 10 00 42.3191752971 -54 47 22.356390376 13.73 14.080 13.185 12.450   B1.5Ve 10 0
25 NGC 3105 OpC 10 00 43 -54 46.8   10.73 9.7     ~ 30 0
26 NGC 3105 5 * 10 00 43.924209 -54 47 27.80746 17.790 17.634 16.822 16.315   B3V 4 0
27 NGC 3105 4 * 10 00 44.4487677725 -54 47 15.333278244 14.890 15.027 14.186 13.504   B2IVe 5 0
28 NGC 3105 60 * 10 00 44.8430450281 -54 46 37.312604380 15.461 15.575 14.751 14.151   B2IVe? 2 0
29 NGC 3105 1 * 10 00 45.2036770297 -54 47 01.090653147 13.623 13.30 12.377 12.11   A0Ib 5 0
30 2MASS J10004549-5446548 * 10 00 45.5057852588 -54 46 54.818713255 18.056 17.754 16.887 16.352   ~ 3 0
31 NGC 3105 66 * 10 00 46.642049 -54 45 22.64847 18.892 15.894 13.279 11.708   K5Ib 1 0
32 NGC 3105 55 * 10 00 50.1495424791 -54 47 07.671121072 15.792 14.445 12.688 11.522   F9Ib 4 0
33 NGC 3105 56 * 10 00 52.6253570566 -54 46 34.038267617 14.523 14.030 13.002 12.272   A0Ib 4 0
34 NGC 3105 101 * 10 01 10.98120 -54 49 16.3128           B2Ve 1 0
35 V* UY Sex HS* 10 50 02.8264873492 -00 00 36.880346331 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 149 0
36 NGC 3766 OpC 11 36 18 -61 36.9   5.66 5.3     ~ 184 0
37 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 429 1
38 NGC 6067 OpC 16 13 11 -54 13.1           ~ 169 0
39 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1130 1
40 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 468 0
41 Cl VDBH 222 OpC 17 18 45 -38 17.7           ~ 18 0
42 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11607 0
43 NGC 6649 OpC 18 33 27 -10 24.2   10.35 8.9     ~ 102 0
44 NGC 6664 OpC 18 36 37 -07 48.8   8.81 7.8     ~ 102 0
45 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 84 0
46 Cl Berkeley 55 OpC 21 17 00 +51 45.9           ~ 20 0
47 NGC 7419 OpC 22 54 20 +60 48.9     13.0     ~ 86 0

    Equat.    Gal    SGal    Ecl

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2020.08.06-09:33:35

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