2011A&A...533A..69C


Query : 2011A&A...533A..69C

2011A&A...533A..69C - Astronomy and Astrophysics, volume 533A, 69-69 (2011/9-1)

Multiple stellar populations in the globular cluster NGC 1851.

CARRETTA E., LUCATELLO S., GRATTON R.G., BRAGAGLIA A. and D'ORAZI V.

Abstract (from CDS):

We present a detailed chemical tagging of individual stellar populations in the Galactic globular cluster (GC) NGC 1851. Abundances are derived from FLAMES spectra for the largest sample of giants (124) and the most extensive number of elements ever analysed in this peculiar GC. The chemistry is characterised using homogeneous abundances of proton-capture (O, Na, Mg, Al, Si), α-capture (Ca, Ti), Fe-peak (Sc, V, Mn, Co, Ni, Cu), and neutron-capture elements (Y, Zr, Ba, La, Ce, Nd, Eu, Dy). We confirm the presence of an [Fe/H] spread larger than the observational errors in this cluster, but too small to clearly separate different sub-populations. We instead propose a classification scheme using a combination of Fe and Ba (which is much more abundant in the more metal-rich group) by means of a cluster analysis. With this approach, we separated stars into two components of a metal-rich (MR) and a metal-poor (MP) population. Each component displays a Na-O anticorrelation, which is a signature of a genuine GC, but has different ratios of primordial (FG) to polluted (SG) stars. Moreover, clear (anti)correlations of Mg and Si with Na and O are found for each component. The level of [α/H] tracks iron and is higher in the MR population, which might therefore have received an additional contribution from core-collapse supernovae. When considering all s-process elements, the MR population shows a larger enrichment than the MP one. This is probably due to the contribution of intermediate-low mass stars, because we find that the level of heavy s-process elements is higher than that of light s-process nuclei in the MR stars; however, a large contribution from low mass stars is unlikely, because it would likely cancel the O-Na anticorrelation. Finally, we confirm the presence of correlations between the amount of proton-capture elements and the level of s-process elements previously found by other investigations, at least for the MR population. This finding apparently requires a quite long delay for the second generation of the MR component. Scenarios for the formation of NGC 1851 appear complex, and are not yet well understood. A merger of two distinct GCs in a parent dwarf galaxy, each cluster with a different Ba level and an age difference of ∼1Gyr, might explain (i) the double subgiant branch; (ii) a possible difference in C content between the two original GCs; and (iii) the Stroemgren photometry of this peculiar cluster. However, the correlation existing between p-capture and n-capture elements within the MR population requires the additional assumption of a long delay for its second generation. More observations are required to fully understand the formation of this GC.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - globular clusters: general - globular clusters: individual: NGC 1851 - stars: Population II

VizieR on-line data: <Available at CDS (J/A+A/533/A69): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat>

Nomenclature: Tables 2-8: [CLG2011] NNNNN N=124 among (Nos 13618-53106).

Simbad objects: 137

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Number of rows : 137
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3658 0
2 GES J05132788-3958168 RG* 05 13 27.8952544124 -39 58 16.821876937   17.187 16.359     ~ 3 0
3 [CLG2011] 13618 RG* 05 13 28.2685528528 -40 10 21.605918446   16.392 15.482     ~ 6 0
4 [CLG2011] 14080 RG* 05 13 38.6800 -40 07 39.500   15.513 14.327     ~ 3 0
5 GES J05134185-4004415 RG* 05 13 41.8641313008 -40 04 41.745421739   17.819 16.994     ~ 5 0
6 GES J05134382-4001154 RG* 05 13 43.8220525302 -40 01 15.572713129   16.859 16.012     ~ 7 0
7 GES J05134740-4004097 RG* 05 13 47.400 -40 04 09.73   17.019 16.090     ~ 6 0
8 2MASS J05134897-4001199 RG* 05 13 48.9852184469 -40 01 20.044714855   16.642 15.769     ~ 6 0
9 [CLG2011] 37220 RG* 05 13 50.3058528553 -40 02 07.132806376   15.974 14.862     ~ 5 0
10 GES J05135063-4006472 RG* 05 13 50.6400761753 -40 06 47.424983846   17.043 16.163     ~ 3 0
11 [CLG2011] 34604 RG* 05 13 50.776 -40 02 36.82   17.487 16.701     ~ 3 0
12 [CLG2011] 48277 RG* 05 13 50.9551534107 -39 56 08.301861961   17.659 16.863     ~ 5 0
13 GES J05135210-3957261 RG* 05 13 52.1076125929 -39 57 26.209051049   16.723 15.753     ~ 5 0
14 [CLG2011] 26880 RG* 05 13 52.9072018716 -40 04 05.337050716   17.537 16.699     ~ 5 0
15 [CLG2011] 43466 RG* 05 13 53.0300 -40 00 43.100   15.305 14.054     ~ 2 0
16 [CLG2011] 39364 RG* 05 13 53.0455129584 -40 01 42.499496663   16.765 15.877     ~ 5 0
17 [CLG2011] 46958 RG* 05 13 53.4711813242 -39 58 45.185741453   17.048 16.204     ~ 5 0
18 2MASS J05135414-4003038 RG* 05 13 54.1523882309 -40 03 04.003033099   16.460 15.517     ~ 6 0
19 GES J05135435-4002179 RG* 05 13 54.3644340225 -40 02 18.129972231   16.650 15.720     ~ 2 0
20 GES J05135599-4004536 RG* 05 13 55.9922518928 -40 04 53.571507455   16.765 15.814     ~ 6 0
21 GES J05135614-4003022 RG* 05 13 56.1503517401 -40 03 02.392374386   17.300 16.450     ~ 2 0
22 GES J05135634-4003448 RG* 05 13 56.3452848252 -40 03 44.816245002   15.319 14.029     ~ 3 0
23 [CLG2011] 41855 RG* 05 13 56.8232002289 -40 01 09.008308178   17.610 16.847     ~ 5 0
24 GES J05135713-4006315 RG* 05 13 57.1399789695 -40 06 31.763534131   17.002 16.120     ~ 5 0
25 [CLG2011] 25037 RG* 05 13 57.642 -40 04 30.96   16.975 16.106     ~ 5 0
26 GES J05135766-4000348 RG* 05 13 57.6792588146 -40 00 35.025159053   17.130 16.315     ~ 2 0
27 2MASS J05135862-3959242 RG* 05 13 58.6294909929 -39 59 24.341039343   17.075 16.238     ~ 5 0
28 2MASS J05135867-4000120 RG* 05 13 58.6871200105 -40 00 12.215832547   15.953 14.957     ~ 4 0
29 [CLG2011] 29203 RG* 05 13 58.8400 -40 03 36.500   16.162 15.115     ~ 4 0
30 GES J05135888-4001146 RG* 05 13 58.8979220200 -40 01 14.754162687   17.812 17.048     ~ 2 0
31 [CLG2011] 45257 RG* 05 13 59.0073632901 -39 59 59.113920011   17.310 16.444     ~ 3 0
32 [CLG2011] 44224 RG* 05 13 59.0549467797 -40 00 26.699843840   17.660 16.839     ~ 5 0
33 [CLG2011] 25497 RG* 05 13 59.2279281007 -40 04 24.405044575   17.452 16.608     ~ 5 0
34 GES J05135977-4002009 RG* 05 13 59.7729550047 -40 02 00.904859393   15.678 14.597     ~ 5 0
35 [CLG2011] 32607 RG* 05 13 59.898 -40 02 58.01   17.064 16.253     ~ 2 0
36 [CLG2011] 28913 RG* 05 14 00.201 -40 03 39.67   16.550 15.633     ~ 3 0
37 [CLG2011] 34631 RG* 05 14 00.209 -40 02 36.01   16.183 15.235     ~ 2 0
38 GES J05140043-4004133 RG* 05 14 00.4469635791 -40 04 13.502340596   14.951 13.422     ~ 2 0
39 GES J05140063-4000413 RG* 05 14 00.632 -40 00 41.24   17.624 16.854     ~ 4 0
40 GES J05140067-3959040 RG* 05 14 00.6882054121 -39 59 04.145047825   17.195 16.369     ~ 2 0
41 2MASS J05140068-4003239 AB* 05 14 00.6943510846 -40 03 24.142885494   15.61 14.53     ~ 6 0
42 [CLG2011] 31624 RG* 05 14 01.747 -40 03 09.35   16.535 15.645     ~ 2 0
43 [CLG2011] 27491 RG* 05 14 01.756 -40 03 57.26   17.499 16.685     ~ 5 0
44 GES J05140233-4001525 RG* 05 14 02.3387864144 -40 01 52.741655374   16.727 15.837     ~ 4 0
45 GES J05140249-4003382 RG* 05 14 02.5072591256 -40 03 38.361160598   16.020 14.991     ~ 2 0
46 2MASS J05140259-4000220 RG* 05 14 02.6033022319 -40 00 22.270070136   16.549 15.653     ~ 6 0
47 [YGN2015] NGC1851 NR 6250 RG* 05 14 02.816 -40 01 23.01   15.025 13.533     ~ 2 0
48 GES J05140332-4001366 RG* 05 14 03.3318554090 -40 01 36.782728437   16.371 15.468     ~ 2 0
49 GES J05140404-4003468 RG* 05 14 04.0537706556 -40 03 46.944596007   16.097 15.121     ~ 2 0
50 [CLG2011] 25678 RG* 05 14 04.138 -40 04 21.58   17.713 16.940     ~ 4 0
51 [CLG2011] 40615 RG* 05 14 04.424 -40 01 25.93   16.114 15.156     ~ 6 0
52 GES J05140456-4005137 RG* 05 14 04.5687815558 -40 05 13.854441833   16.820 15.945     ~ 4 0
53 GES J05140458-4001341 RG* 05 14 04.5964139148 -40 01 34.248066055   16.034 15.048     ~ 2 0
54 [CLG2011] 28116 RG* 05 14 04.602 -40 03 49.57   17.040 16.200     ~ 5 0
55 2MASS J05140473-4007017 RG* 05 14 04.7383507265 -40 07 01.938528534   17.339 16.521     ~ 7 0
56 GES J05140489-4004385 RG* 05 14 04.9074033866 -40 04 38.657060686   17.098 16.265     ~ 2 0
57 [CLG2011] 43136 RG* 05 14 04.982 -40 00 48.12   17.771 17.020     ~ 2 0
58 [CLG2011] 45090 RG* 05 14 05.6317749656 -40 00 03.704975600   17.047 16.228     ~ 5 0
59 [CLG2011] 48085 RG* 05 14 06.1800 -39 56 43.300   16.115 15.144     ~ 4 0
60 2MASS J05140647-4005417 RG* 05 14 06.4785255419 -40 05 41.893542064   17.344 16.515     ~ 6 0
61 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1294 0
62 Cl* NGC 1851 PML 37 * 05 14 07.3198872805 -40 01 30.338705699   16.414 15.533     ~ 6 0
63 [CLG2011] 23647 RG* 05 14 07.418 -40 04 55.58   16.693 15.806     ~ 3 0
64 [CLG2011] 41198 RG* 05 14 07.7881182673 -40 01 18.298954021   15.829 14.793     ~ 4 0
65 GES J05140782-3959532 RG* 05 14 07.8416345637 -39 59 53.354137882   17.605 16.784     ~ 2 0
66 [CLG2011] 27864 RG* 05 14 08.016 -40 03 52.64   16.564 15.704     ~ 2 0
67 [CLG2011] 21453 RG* 05 14 08.5053331979 -40 05 54.520140398   16.746 15.835     ~ 5 0
68 GES J05140891-4001489 RG* 05 14 08.9267008060 -40 01 49.115486613   16.428 15.469     ~ 2 0
69 GES J05140949-4004052 RG* 05 14 09.5013532513 -40 04 05.325792820   16.245 15.216     ~ 2 0
70 [CLG2011] 24485 RG* 05 14 09.562 -40 04 40.18   17.577 16.784     ~ 2 0
71 GES J05140985-4001360 RG* 05 14 09.8642745166 -40 01 36.203671785   15.192 13.908     ~ 2 0
72 2MASS J05141002-3959035 RG* 05 14 10.0378838511 -39 59 03.647601355   17.316 16.521     ~ 6 0
73 2MASS J05141052-3958095 RG* 05 14 10.5411448762 -39 58 09.613350908   16.341 15.437     ~ 5 0
74 [CLG2011] 29223 RG* 05 14 10.724 -40 03 35.77   17.170 16.362     ~ 2 0
75 GES J05141074-4004189 RG* 05 14 10.7441038926 -40 04 18.937228617   15.421 14.252     ~ 4 0
76 GES J05141107-4001411 RG* 05 14 11.0853378158 -40 01 41.286104383   16.317 15.417     ~ 2 0
77 2MASS J05141133-4004092 RG* 05 14 11.3377866696 -40 04 09.403210248   17.293 16.472     ~ 7 0
78 GES J05141166-4002042 RG* 05 14 11.6766396116 -40 02 04.397340677   16.897 16.083     ~ 2 0
79 GES J05141171-3959545 RG* 05 14 11.7146263930 -39 59 54.557712270   16.981 16.155     ~ 6 0
80 GES J05141181-4003189 RG* 05 14 11.8214347643 -40 03 19.058462757   17.705 16.964     ~ 2 0
81 [CLG2011] 35999 RG* 05 14 12.0700 -40 02 20.200   15.962 14.971     ~ 4 0
82 Cl* NGC 1851 PML 21 * 05 14 12.852 -40 03 10.05   16.998 16.158     ~ 6 0
83 [CLG2011] 31284 RG* 05 14 14.1217993467 -40 03 12.808178187   16.767 15.893     ~ 5 0
84 [CLG2011] 47698 RG* 05 14 14.1512068327 -39 57 35.772883012   16.684 15.828     ~ 3 0
85 GES J05141427-3959132 RG* 05 14 14.2889671304 -39 59 13.282448475   17.081 16.268     ~ 2 0
86 GES J05141446-3956211 RG* 05 14 14.4781826149 -39 56 21.271390671   17.626 16.853     ~ 2 0
87 GES J05141447-4001109 RG* 05 14 14.4808768996 -40 01 10.944056758   15.525 14.317     ~ 6 0
88 [CLG2011] 36584 RG* 05 14 14.5421609220 -40 02 13.495841978   15.585 14.446     ~ 3 0
89 [CLG2011] 20922 RG* 05 14 14.9505726725 -40 06 15.537374425   16.705 15.784     ~ 6 0
90 GES J05141498-4002485 RG* 05 14 15.0023048823 -40 02 48.687859634   15.906 14.893     ~ 2 0
91 GES J05141566-4000059 RG* 05 14 15.6665717895 -40 00 05.923841346   17.096 16.245     ~ 6 0
92 Cl* NGC 1851 PML 15 * 05 14 15.756 -40 03 29.98   15.330 14.166     ~ 5 0
93 [CLG2011] 32256 RG* 05 14 15.8426211972 -40 03 01.616461656   16.947 16.109     ~ 5 0
94 GES J05141638-4003542 RG* 05 14 16.3889988929 -40 03 54.254491704   16.630 15.703     ~ 4 0
95 [CLG2011] 26928 RG* 05 14 17.128 -40 04 03.88   17.074 16.234     ~ 3 0
96 2MASS J05141724-4002080 RG* 05 14 17.2542904049 -40 02 08.020997967   15.531 14.375     ~ 4 0
97 [CLG2011] 29470 RG* 05 14 17.5300 -40 03 32.700   17.413 16.548     ~ 4 0
98 [CLG2011] 31463 RG* 05 14 17.576 -40 03 10.61   17.774 17.031     ~ 5 0
99 [YGN2015] NGC1851 NR 1290 RG* 05 14 19.3511488524 -40 04 23.824040671   15.02 13.30     ~ 10 0
100 [CLG2011] 30286 RG* 05 14 19.466 -40 03 23.76   16.985 16.115     ~ 5 0
101 2MASS J05141947-4000076 RG* 05 14 19.4879482231 -40 00 07.680385279   16.04 14.95     ~ 6 0
102 2MASS J05141956-4004055 RG* 05 14 19.5782132323 -40 04 05.534611688   15.555 14.418     ~ 6 0
103 GES J05141979-4006446 RG* 05 14 19.7952810883 -40 06 44.707628123   17.281 16.429     ~ 7 0
104 [CLG2011] 20827 RG* 05 14 20.360 -40 06 20.61   17.790 17.012     ~ 2 0
105 GES J05142052-4003112 RG* 05 14 20.5324211749 -40 03 11.346628097   17.569 16.761     ~ 4 0
106 [CLG2011] 48388 RG* 05 14 20.6173847023 -39 55 53.837345273   16.937 16.136     ~ 5 0
107 2MASS J05142070-4004195 RG* 05 14 20.7103021146 -40 04 19.521726666   17.344 16.493     ~ 7 0
108 [CLG2011] 22588 RG* 05 14 20.7814010503 -40 05 18.937247257   16.762 15.878     ~ 5 0
109 2MASS J05142281-4001551 RG* 05 14 22.8225244756 -40 01 55.141246683   17.014 16.164     ~ 3 0
110 [CLG2011] 36292 RG* 05 14 23.1188834108 -40 02 16.240791765   17.724 16.917     ~ 5 0
111 GES J05142480-4002227 RG* 05 14 24.8100043702 -40 02 22.699191993   16.813 15.874     ~ 6 0
112 [CLG2011] 39801 RG* 05 14 25.303 -40 01 36.19   15.016 13.612     ~ 1 0
113 [YGN2015] NGC1851 NR 3213 RG* 05 14 25.9738418680 -40 02 53.763295993   15.205 13.821     ~ 4 0
114 [CLG2011] 38818 RG* 05 14 26.325 -40 01 48.13   17.618 16.804     ~ 5 0
115 GES J05142706-3959409 RG* 05 14 27.0798374804 -39 59 40.965133949   16.452 15.559     ~ 2 0
116 [CLG2011] 22360 RG* 05 14 28.5206181672 -40 05 24.783540112   17.123 16.223     ~ 5 0
117 2MASS J05142874-4003159 RG* 05 14 28.7560588745 -40 03 15.896787087   16.01 14.88 14.61   ~ 5 0
118 [CLG2011] 52579 RG* 05 14 32.7511114572 -40 01 53.199862991   17.587 16.801     ~ 4 0
119 GES J05143531-4005355 RG* 05 14 35.3164995083 -40 05 35.495509496   16.530 15.572     ~ 4 0
120 GES J05143586-4002087 RG* 05 14 35.8762867632 -40 02 08.711024202   17.754 16.981     ~ 2 0
121 2MASS J05143598-4005532 RG* 05 14 35.9989323769 -40 05 53.046434139   17.512 16.680     ~ 6 0
122 GES J05143693-4001278 RG* 05 14 36.9498211628 -40 01 27.752887445   17.766 16.999     ~ 2 0
123 [CLG2011] 52570 RG* 05 14 39.4271098296 -40 01 54.586623016   17.680 16.902     ~ 4 0
124 [CLG2011] 49965 RG* 05 14 48.6787450160 -40 09 00.914630488   17.156 16.242     ~ 5 0
125 [CLG2011] 53106 RG* 05 14 56.0316033357 -40 00 41.430872043   15.103 13.371     ~ 2 0
126 [CLG2011] 51311 RG* 05 15 00.8732360765 -40 04 41.763133359   16.706 15.758     ~ 5 0
127 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 744 0
128 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 447 0
129 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1297 0
130 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3127 0
131 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1836 0
132 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1726 0
133 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1262 0
134 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 958 0
135 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1857 0
136 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 381 0
137 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 470 0

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2021.09.23-11:54:27

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