2018A&A...615A..17C

Query : 2018A&A...615A..17C

2018A&A...615A..17C - Astronomy and Astrophysics, volume 615A17-17 (2018/7-1)

Aluminium abundances in five discrete stellar populations of the globular cluster NGC 2808.

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

Abstract (from CDS):

We observed a sample of 90 red giant branch (RGB) stars in NGC 2808 using FLAMES/GIRAFFE and the high resolution grating with the set-up HR21. These stars have previous accurate atmospheric parameters and abundances of light elements. We derived aluminium abundances for them from the strong doublet Al i 8772-8773 Å as in previous works of our group. In addition, we were able to estimate the relative CN abundances for 89 of the stars from the strength of a large number of CN features. When adding self-consistent abundances from previous UVES spectra analysed by our team, we gathered [Al/Fe] ratios for a total of 108 RGB stars in NGC 2808. The full dataset of proton-capture elements is used to explore in detail the five spectroscopically detected discrete components in this globular cluster. We found that various classes of polluters are required to reproduce (anti)-correlations among all proton-capture elements in the populations P2, I1, and I2 with intermediate composition. This is in agreement with the detection of lithium in lower RGB second generation stars, requiring at least two kind of polluters. For chemically homogeneous populations, the best subdivision of our sample is into six components as derived from statistical cluster analysis. By comparing different diagrams [element/Fe] versus [element/Fe], we show for the first time that a simple dilution model is not able to reproduce all the subpopulations in this cluster. Polluters of different masses are required. NGC 2808 is confirmed to be a tough challenge to any scenario for globular cluster formation.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: abundances - stars: atmospheres - stars: population II - globular clusters: general - globular clusters: individual: NGC 2808

VizieR on-line data: <Available at CDS (J/A+A/615/A17): table1.dat table3.dat>

Simbad objects: 96

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Number of rows : 96
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 Cl* NGC 2808 PKD 31851 RG* 09 11 14.3690043144 -64 53 36.038378184   16.425 15.305   14.038 ~ 18 0
4 Cl* NGC 2808 PKD 32469 * 09 11 16.3261261608 -64 52 55.939775952   15.485 14.040     ~ 9 0
5 Cl* NGC 2808 PKD 32924 RG* 09 11 22.2971348640 -64 52 31.067245344   16.138 14.853     ~ 15 0
6 Cl* NGC 2808 PKD 30523 RG* 09 11 22.4892602352 -64 55 23.361829104   16.658 15.489     ~ 10 0
7 2MASS J09112522-6450535 RG* 09 11 25.2339697152 -64 50 53.544322680   16.581 15.435   14.110 ~ 10 0
8 2MASS J09112752-6451312 RG* 09 11 27.5269876296 -64 51 31.259076084   16.346 15.119     ~ 18 0
9 Cl* NGC 2808 PKD 30720 Pe* 09 11 28.0866460800 -64 55 01.819502004   16.557 15.387     ~ 12 0
10 2MASS J09113076-6453377 AB* 09 11 30.7662378576 -64 53 37.749999660   15.369 13.998   12.520 ~ 12 0
11 Cl* NGC 2808 PKD 30763 RG* 09 11 31.6223106456 -64 54 58.008574440   15.946 14.694   13.345 ~ 22 0
12 Cl* NGC 2808 PKD 13575 RG* 09 11 31.6291677456 -64 49 02.247435048   16.612 15.449   14.093 ~ 16 0
13 Cl* NGC 2808 PKD 31361 * 09 11 33.3296491272 -64 54 09.262473912   16.405 15.204     ~ 12 0
14 Cl* NGC 2808 PKD 30900 * 09 11 36.3279809904 -64 54 47.110301748   16.319 15.084     ~ 12 0
15 Cl* NGC 2808 PKD 32398 RG* 09 11 39.4670646474 -64 53 01.292857123   15.437 14.339 14.378   ~ 9 0
16 Cl* NGC 2808 PKD 33452 * 09 11 40.8063492456 -64 52 01.560497484   16.405 15.170     ~ 5 0
17 Cl* NGC 2808 PKD 50119 RG* 09 11 42.9401874600 -64 51 39.851064576   15.425 13.886     ~ 14 0
18 Cl* NGC 2808 PKD 56032 RG* 09 11 45.5999197848 -64 50 04.287877008   15.579 13.976     ~ 13 0
19 Cl* NGC 2808 PKD 46036 RG* 09 11 45.8689337544 -64 52 44.497358040   15.810 14.532     ~ 8 0
20 2MASS J09114635-6450261 RG* 09 11 46.3531912632 -64 50 26.105933688   16.090 14.853   13.455 ~ 10 0
21 Cl* NGC 2808 PKD 44213 * 09 11 46.6891641696 -64 53 15.489031848   16.413 15.266     ~ 4 0
22 Cl* NGC 2808 PKD 48011 RG* 09 11 48.0244289832 -64 52 12.278485488   15.718 14.397     ~ 10 0
23 Cl* NGC 2808 PKD 40983 RG* 09 11 48.6829291344 -64 54 20.780404776   15.723 14.360     ~ 10 0
24 Cl* NGC 2808 PKD 53579 * 09 11 48.75576 -64 50 44.7504   15.830 14.461     ~ 5 0
25 Cl* NGC 2808 PKD 8198 * 09 11 48.9744823200 -64 48 59.546993868   16.572 15.340     ~ 4 0
26 Cl* NGC 2808 PKD 54266 * 09 11 50.1551414736 -64 50 33.948953772   16.028 14.790     ~ 4 0
27 Cl* NGC 2808 PKD 51646 * 09 11 50.3544405024 -64 51 15.423468840   16.550 15.460     ~ 6 0
28 Cl* NGC 2808 PKD 37831 RG* 09 11 50.8523300760 -64 56 37.681266012   16.546 15.428   14.154 ~ 17 0
29 Cl* NGC 2808 PKD 41969 * 09 11 50.9092596216 -64 53 57.645032496   15.787 14.446     ~ 8 0
30 Cl* NGC 2808 PKD 8739 RG* 09 11 51.2017826880 -64 48 37.535678100   15.721 14.332   12.779 ~ 23 0
31 Cl* NGC 2808 PKD 46800 * 09 11 51.3849290640 -64 52 31.740968460   15.423 13.931     ~ 4 0
32 Cl* NGC 2808 PKD 47502 * 09 11 51.6487661880 -64 52 19.858405872   15.521 14.113     ~ 4 0
33 Cl* NGC 2808 PKD 50866 * 09 11 54.2822927328 -64 51 27.930636288   15.941 14.634     ~ 6 0
34 Cl* NGC 2808 PKD 54284 RG* 09 11 54.7807591296 -64 50 33.677300796   15.789 14.407     ~ 10 0
35 Cl* NGC 2808 PKD 41207 RG* 09 11 54.9575808696 -64 54 14.771731176   15.478 13.997     ~ 8 0
36 Cl* NGC 2808 PKD 44996 RG* 09 11 56.36 -64 53 01.8   15.773 14.391     ~ 8 0
37 Cl* NGC 2808 PKD 47071 * 09 11 56.53 -64 52 27.0   15.845 14.605     ~ 4 0
38 Cl* NGC 2808 PKD 43097 * 09 11 56.6141034624 -64 53 35.571588360   16.460 15.370     ~ 4 0
39 Cl* NGC 2808 PKD 10265 RG* 09 11 56.6800278144 -64 47 00.526187832   15.711 14.359   12.886 ~ 15 0
40 Cl* NGC 2808 PKD 51519 * 09 11 56.8276249599 -64 51 17.502750810   15.540 14.146     ~ 6 0
41 Cl* NGC 2808 PKD 7788 RG* 09 11 57.1963946520 -64 49 14.567412792   16.202 14.974   13.578 ~ 15 0
42 2MASS J09115856-6447230 RG* 09 11 58.5644064240 -64 47 23.126602704   15.651 14.266   12.761 ~ 11 0
43 2MASS J09115856-6448591 RG* 09 11 58.5762075696 -64 48 59.278243536   16.376 15.169   13.792 ~ 11 0
44 Cl* NGC 2808 PKD 7315 RG* 09 11 58.5789412152 -64 49 29.904951324   15.930 14.683     ~ 13 0
45 Cl* NGC 2808 PKD 47805 Pe* 09 11 59.0056452720 -64 52 15.457601028   15.548 14.152     ~ 6 0
46 Cl* NGC 2808 PKD 9724 RG* 09 12 00.9147121824 -64 47 43.190927844   15.869 14.508     ~ 14 0
47 Cl* NGC 2808 PKD 47700 * 09 12 01.06920 -64 52 16.8996   16.039 14.810     ~ 3 0
48 Cl* NGC 2808 SAW V47 LP* 09 12 01.4936762184 -64 50 49.335094320   15.33 13.85 13.168 12.10 ~ 7 0
49 Cl* NGC 2808 PKD 56103 * 09 12 01.8358535496 -64 50 03.008147712   16.502 15.347     ~ 4 0
50 Cl* NGC 2808 PKD 7183 * 09 12 02.8710 -64 49 34.069   16.168 14.854     ~ 5 0
51 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
52 Cl* NGC 2808 PKD 52891 * 09 12 03.15432 -64 50 55.7664   15.721 14.426     ~ 4 0
53 Cl* NGC 2808 PKD 41050 RG* 09 12 03.3954357720 -64 54 18.738316728   15.840 14.502     ~ 8 0
54 Cl* NGC 2808 PKD 45530 * 09 12 03.4413140064 -64 52 52.730883084   15.984 14.737     ~ 4 0
55 Cl* NGC 2808 PKD 47638 * 09 12 03.6988 -64 52 17.777   15.641 14.337     ~ 4 0
56 Cl* NGC 2808 PKD 43972 * 09 12 04.1173059888 -64 53 19.719697560   16.379 15.270     ~ 4 0
57 Cl* NGC 2808 PKD 52048 * 09 12 05.76552 -64 51 08.9748   15.645 14.259     ~ 5 0
58 Cl* NGC 2808 PKD 48424 * 09 12 06.59184 -64 52 05.7468   15.772 14.452     ~ 4 0
59 Cl* NGC 2808 PKD 53629 * 09 12 06.5977697232 -64 50 43.874320776   16.443 15.340     ~ 4 0
60 Cl* NGC 2808 PKD 49753 Pe* 09 12 06.86376 -64 51 45.3960   15.669 14.350     ~ 8 0
61 Cl* NGC 2808 PKD 46908 * 09 12 07.02 -64 52 29.7   15.636 14.264     ~ 4 0
62 Cl* NGC 2808 PKD 41828 RG* 09 12 08.5587458208 -64 54 00.644854536   15.862 14.521     ~ 10 0
63 Cl* NGC 2808 PKD 52083 * 09 12 08.5727 -64 51 08.436   16.571 15.408     ~ 3 0
64 Cl* NGC 2808 PKD 47667 * 09 12 09.4977323400 -64 52 17.437419624   15.817 14.444     ~ 6 0
65 Cl* NGC 2808 PKD 8826 RG* 09 12 09.8051444016 -64 48 33.218930304   16.250 15.082   13.760 ~ 15 0
66 Cl* NGC 2808 PKD 55354 * 09 12 10.3400253816 -64 50 16.076926572   16.024 14.749     ~ 5 0
67 Cl* NGC 2808 PKD 43194 * 09 12 11.0537263680 -64 53 33.678658104   15.876 14.595     ~ 4 0
68 Cl* NGC 2808 PKD 52647 * 09 12 12.2891220288 -64 50 59.550838836   15.925 14.654     ~ 5 0
69 Cl* NGC 2808 PKD 37998 RG* 09 12 12.5567032776 -64 56 24.588303036   15.638 14.233     ~ 13 0
70 2MASS J09121334-6448114 RG* 09 12 13.3492296480 -64 48 11.602585332   15.529 14.054   12.468 ~ 10 0
71 Cl* NGC 2808 PKD 50685 * 09 12 13.88160 -64 51 30.6180   15.872 14.551     ~ 7 0
72 Cl* NGC 2808 PKD 37496 RG* 09 12 13.8832846776 -64 57 09.402518592   16.126 14.871     ~ 9 0
73 Cl* NGC 2808 PKD 8603 RG* 09 12 14.0467933080 -64 48 42.899736852   15.847 14.432     ~ 21 0
74 Cl* NGC 2808 PKD 56924 RG* 09 12 15.1469583000 -64 49 48.830610504   15.629 14.207     ~ 9 0
75 Cl* NGC 2808 PKD 44665 RG* 09 12 15.2809298856 -64 53 07.334620800   15.649 14.245     ~ 11 0
76 Cl* NGC 2808 PKD 46663 * 09 12 17.1043861656 -64 52 33.907128888   15.860 14.551     ~ 8 0
77 Cl* NGC 2808 PKD 41008 RG* 09 12 17.6783706816 -64 54 19.833491556   16.339 15.189     ~ 16 0
78 Cl* NGC 2808 PKD 44716 RG* 09 12 17.8531045896 -64 53 06.402788448   16.123 14.899     ~ 9 0
79 2MASS J09121810-6451094 AB* 09 12 18.1077432960 -64 51 09.467128872   15.628 14.376   12.990 ~ 15 0
80 Cl* NGC 2808 PKD 45443 Pe* 09 12 21.3744174000 -64 52 54.103476720   15.885 14.574     ~ 8 0
81 2MASS J09122151-6450338 RG* 09 12 21.5171100744 -64 50 33.729479556   16.483 15.387   14.101 ~ 13 0
82 Cl* NGC 2808 PKD 50561 Pe* 09 12 23.17056 -64 51 32.5980   16.120 14.834     ~ 7 0
83 Cl* NGC 2808 PKD 10341 RG* 09 12 25.4134209432 -64 46 52.398005016   15.997 14.708   13.308 ~ 17 0
84 Cl* NGC 2808 PKD 43794 RG* 09 12 26.3451501936 -64 53 22.581072528   15.861 14.554     ~ 10 0
85 Cl* NGC 2808 PKD 37505 RG* 09 12 26.4240193344 -64 57 08.387830800   16.058 14.783     ~ 14 0
86 2MASS J09122762-6451100 RG* 09 12 27.6381518160 -64 51 10.113163416   15.665 14.270   12.727 ~ 13 0
87 2MASS J09122929-6451188 RG* 09 12 29.2978287624 -64 51 18.908221428   16.207 15.010   13.653 ~ 11 0
88 Cl* NGC 2808 PKD 55609 RG* 09 12 29.9342071224 -64 50 11.369071716   16.084 14.817   13.386 ~ 15 0
89 2MASS J09123015-6449519 RG* 09 12 30.1640751480 -64 49 52.032423864   16.592 15.482   14.178 ~ 13 0
90 Cl* NGC 2808 PKD 41688 RG* 09 12 35.2736997528 -64 54 03.783608424   16.293 15.089     ~ 13 0
91 Cl* NGC 2808 PKD 49743 RG* 09 12 36.8014065984 -64 51 45.082943280   16.353 15.168     ~ 20 0
92 Cl* NGC 2808 PKD 38660 RG* 09 12 39.8704213728 -64 55 43.079179836   15.672 14.290     ~ 20 0
93 Cl* NGC 2808 PKD 10571 RG* 09 12 41.1212222904 -64 46 25.847795244   15.806 14.376     ~ 21 0
94 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
95 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
96 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0

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