2006A&A...450..523C

Query : 2006A&A...450..523C

2006A&A...450..523C - Astronomy and Astrophysics, volume 450523-533 (2006/5-1)

Na-O anticorrelation and HB. I. The Na-O anticorrelation in NGC 2808.

CARRETTA E., BRAGAGLIA A., GRATTON R.G., LEONE F., RECIO-BLANCO A. and LUCATELLO S.

Abstract (from CDS):

We derived the atmospheric parameters and elemental abundances of Fe, O, and Na for about 120 red giant stars in the Galactic globular cluster NGC 2808. Our results are based on the analysis of medium-high resolution (R=22000-24000) GIRAFFE spectra acquired with the FLAMES spectrograph at VLT-UT2 as a part of a project aimed at studying the Na-O anticorrelation as a function of physical parameters in globular clusters. We present the anticorrelation of Na and O abundances in NGC 2808 here, and discuss the distribution function of stars along this relation. Besides a bulk of O-normal stars with the typical composition of field halo stars, NGC 2808 seems to host two other groups of O-poor and super O-poor stars. In this regard, NGC 2808 is similar to M 13, the template cluster for the Na-O anticorrelation. However, in contrast to M 13, most stars in NGC 2808 are O-rich. This might be related to the horizontal branch morphologies that are very different in these two clusters. The average metallicity we found for NGC 2808 is [Fe/H]=-1.10 (rms=0.065dex, from 123 stars). We also found some evidence of a small intrinsic spread in metallicity, but more definitive conclusions are hampered by the presence of a small differential reddening.

Abstract Copyright: ∼

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

Simbad objects: 151

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Number of rows : 151
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 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
4 Cl* NGC 2808 PKD 33918 RG* 09 11 01.6894011672 -64 51 36.042636456   15.784 14.417   12.925 ~ 23 0
5 Cl* NGC 2808 PKD 30873 * 09 11 09.0001622736 -64 54 49.621589748   15.995 14.821     ~ 9 0
6 Cl* NGC 2808 PKD 31851 RG* 09 11 14.3690043144 -64 53 36.038378184   16.425 15.305   14.038 ~ 18 0
7 Cl* NGC 2808 PKD 32469 * 09 11 16.3261261608 -64 52 55.939775952   15.485 14.040     ~ 9 0
8 Cl* NGC 2808 PKD 32924 RG* 09 11 22.2971348640 -64 52 31.067245344   16.138 14.853     ~ 15 0
9 Cl* NGC 2808 PKD 30523 RG* 09 11 22.4892602352 -64 55 23.361829104   16.658 15.489     ~ 10 0
10 Cl* NGC 2808 PKD 35265 RG* 09 11 22.7193948024 -64 50 12.039380520   16.551 15.377   14.017 ~ 14 0
11 2MASS J09112522-6450535 RG* 09 11 25.2339697152 -64 50 53.544322680   16.581 15.435   14.110 ~ 10 0
12 2MASS J09112752-6451312 RG* 09 11 27.5269876296 -64 51 31.259076084   16.346 15.119     ~ 18 0
13 Cl* NGC 2808 PKD 30720 Pe* 09 11 28.0866460800 -64 55 01.819502004   16.557 15.387     ~ 12 0
14 2MASS J09113076-6453377 AB* 09 11 30.7662378576 -64 53 37.749999660   15.369 13.998   12.520 ~ 12 0
15 Cl* NGC 2808 PKD 30763 RG* 09 11 31.6223106456 -64 54 58.008574440   15.946 14.694   13.345 ~ 22 0
16 Cl* NGC 2808 PKD 13575 RG* 09 11 31.6291677456 -64 49 02.247435048   16.612 15.449   14.093 ~ 16 0
17 Cl* NGC 2808 PKD 31361 * 09 11 33.3296491272 -64 54 09.262473912   16.405 15.204     ~ 12 0
18 Cl* NGC 2808 PKD 30900 * 09 11 36.3279809904 -64 54 47.110301748   16.319 15.084     ~ 12 0
19 Cl* NGC 2808 PKD 32398 RG* 09 11 39.4670646474 -64 53 01.292857123   15.437 14.339 14.378   ~ 9 0
20 Cl* NGC 2808 PKD 32909 * 09 11 39.6813838032 -64 52 31.940480172   16.272 15.022     ~ 5 0
21 Cl* NGC 2808 PKD 33452 * 09 11 40.8063492456 -64 52 01.560497484   16.405 15.170     ~ 5 0
22 Cl* NGC 2808 PKD 50910 * 09 11 42.6592567848 -64 51 27.324970056   16.234 14.984     ~ 5 0
23 Cl* NGC 2808 PKD 50119 RG* 09 11 42.9401874600 -64 51 39.851064576   15.425 13.886     ~ 14 0
24 Cl* NGC 2808 PKD 8679 * 09 11 44.5642081800 -64 48 39.909852936   16.164 14.961     ~ 8 0
25 Cl* NGC 2808 PKD 56032 RG* 09 11 45.5999197848 -64 50 04.287877008   15.579 13.976     ~ 13 0
26 Cl* NGC 2808 PKD 46036 RG* 09 11 45.8689337544 -64 52 44.497358040   15.810 14.532     ~ 8 0
27 2MASS J09114635-6450261 RG* 09 11 46.3531912632 -64 50 26.105933688   16.090 14.853   13.455 ~ 10 0
28 Cl* NGC 2808 PKD 44213 * 09 11 46.6891641696 -64 53 15.489031848   16.413 15.266     ~ 4 0
29 Cl* NGC 2808 PKD 48011 RG* 09 11 48.0244289832 -64 52 12.278485488   15.718 14.397     ~ 10 0
30 Cl* NGC 2808 PKD 40983 RG* 09 11 48.6829291344 -64 54 20.780404776   15.723 14.360     ~ 10 0
31 Cl* NGC 2808 PKD 53579 * 09 11 48.75576 -64 50 44.7504   15.830 14.461     ~ 5 0
32 Cl* NGC 2808 PKD 8198 * 09 11 48.9744823200 -64 48 59.546993868   16.572 15.340     ~ 4 0
33 Cl* NGC 2808 PKD 51930 Pe* 09 11 49.9491199176 -64 51 10.915245144   15.531 14.068     ~ 6 0
34 Cl* NGC 2808 PKD 54266 * 09 11 50.1551414736 -64 50 33.948953772   16.028 14.790     ~ 4 0
35 Cl* NGC 2808 PKD 51646 * 09 11 50.3544405024 -64 51 15.423468840   16.550 15.460     ~ 6 0
36 Cl* NGC 2808 PKD 37831 RG* 09 11 50.8523300760 -64 56 37.681266012   16.546 15.428   14.154 ~ 17 0
37 Cl* NGC 2808 PKD 41969 * 09 11 50.9092596216 -64 53 57.645032496   15.787 14.446     ~ 8 0
38 Cl* NGC 2808 PKD 45701 * 09 11 51.1281168336 -64 52 49.987206264   16.231 15.025     ~ 3 0
39 Cl* NGC 2808 PKD 8739 RG* 09 11 51.2017826880 -64 48 37.535678100   15.721 14.332   12.779 ~ 23 0
40 Cl* NGC 2808 PKD 46800 * 09 11 51.3849290640 -64 52 31.740968460   15.423 13.931     ~ 4 0
41 Cl* NGC 2808 PKD 47502 * 09 11 51.6487661880 -64 52 19.858405872   15.521 14.113     ~ 4 0
42 Cl* NGC 2808 PKD 49493 * 09 11 52.93200 -64 51 49.2948   16.321 15.143     ~ 3 0
43 Cl* NGC 2808 PKD 46587 * 09 11 54.15864 -64 52 35.1624   15.815 14.488     ~ 3 0
44 Cl* NGC 2808 PKD 50866 * 09 11 54.2822927328 -64 51 27.930636288   15.941 14.634     ~ 6 0
45 Cl* NGC 2808 PKD 54284 RG* 09 11 54.7807591296 -64 50 33.677300796   15.789 14.407     ~ 10 0
46 Cl* NGC 2808 PKD 41207 RG* 09 11 54.9575808696 -64 54 14.771731176   15.478 13.997     ~ 8 0
47 Cl* NGC 2808 PKD 51256 * 09 11 55.20 -64 51 21.7   15.876 14.567     ~ 3 0
48 Cl* NGC 2808 PKD 49122 RG* 09 11 55.41024 -64 51 54.7596   16.253 15.027     ~ 6 0
49 Cl* NGC 2808 PKD 9785 * 09 11 55.6259616912 -64 47 39.802956144   16.493 15.346     ~ 5 0
50 Cl* NGC 2808 PKD 44996 RG* 09 11 56.36 -64 53 01.8   15.773 14.391     ~ 8 0
51 Cl* NGC 2808 PKD 47421 * 09 11 56.4474689568 -64 52 21.280310400   15.571 14.175     ~ 5 0
52 Cl* NGC 2808 PKD 47071 * 09 11 56.53 -64 52 27.0   15.845 14.605     ~ 4 0
53 Cl* NGC 2808 PKD 43097 * 09 11 56.6141034624 -64 53 35.571588360   16.460 15.370     ~ 4 0
54 Cl* NGC 2808 PKD 10265 RG* 09 11 56.6800278144 -64 47 00.526187832   15.711 14.359   12.886 ~ 15 0
55 Cl* NGC 2808 PKD 51519 * 09 11 56.8276249599 -64 51 17.502750810   15.540 14.146     ~ 6 0
56 Cl* NGC 2808 PKD 7788 RG* 09 11 57.1963946520 -64 49 14.567412792   16.202 14.974   13.578 ~ 15 0
57 2MASS J09115856-6447230 RG* 09 11 58.5644064240 -64 47 23.126602704   15.651 14.266   12.761 ~ 11 0
58 2MASS J09115856-6448591 RG* 09 11 58.5762075696 -64 48 59.278243536   16.376 15.169   13.792 ~ 11 0
59 Cl* NGC 2808 PKD 7315 RG* 09 11 58.5789412152 -64 49 29.904951324   15.930 14.683     ~ 13 0
60 Cl* NGC 2808 PKD 45496 * 09 11 58.91856 -64 52 53.4288   15.799 14.485     ~ 3 0
61 Cl* NGC 2808 PKD 47805 Pe* 09 11 59.0056452720 -64 52 15.457601028   15.548 14.152     ~ 6 0
62 Cl* NGC 2808 PKD 53209 * 09 11 59.2870068264 -64 50 50.635836780   15.778 14.427     ~ 3 0
63 Cl* NGC 2808 PKD 54789 * 09 12 00.4331026128 -64 50 25.560679812   15.626 14.247     ~ 5 0
64 Cl* NGC 2808 PKD 9724 RG* 09 12 00.9147121824 -64 47 43.190927844   15.869 14.508     ~ 14 0
65 Cl* NGC 2808 PKD 47700 * 09 12 01.06920 -64 52 16.8996   16.039 14.810     ~ 3 0
66 Cl* NGC 2808 SAW V47 LP* 09 12 01.4936762184 -64 50 49.335094320   15.33 13.85 13.168 12.10 ~ 7 0
67 Cl* NGC 2808 PKD 56103 * 09 12 01.8358535496 -64 50 03.008147712   16.502 15.347     ~ 4 0
68 Cl* NGC 2808 PKD 54644 * 09 12 02.1041906448 -64 50 28.117816224   16.513 15.347     ~ 3 0
69 Cl* NGC 2808 PKD 7183 * 09 12 02.8710 -64 49 34.069   16.168 14.854     ~ 5 0
70 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
71 Cl* NGC 2808 PKD 52891 * 09 12 03.15432 -64 50 55.7664   15.721 14.426     ~ 4 0
72 Cl* NGC 2808 PKD 41050 RG* 09 12 03.3954357720 -64 54 18.738316728   15.840 14.502     ~ 8 0
73 Cl* NGC 2808 PKD 45530 * 09 12 03.4413140064 -64 52 52.730883084   15.984 14.737     ~ 4 0
74 Cl* NGC 2808 PKD 47638 * 09 12 03.6988 -64 52 17.777   15.641 14.337     ~ 4 0
75 Cl* NGC 2808 PKD 43972 * 09 12 04.1173059888 -64 53 19.719697560   16.379 15.270     ~ 4 0
76 Cl* NGC 2808 PKD 46924 * 09 12 04.6008 -64 52 29.587   16.096 14.826     ~ 4 0
77 Cl* NGC 2808 PKD 52048 * 09 12 05.76552 -64 51 08.9748   15.645 14.259     ~ 5 0
78 Cl* NGC 2808 PKD 48424 * 09 12 06.59184 -64 52 05.7468   15.772 14.452     ~ 4 0
79 Cl* NGC 2808 PKD 53629 * 09 12 06.5977697232 -64 50 43.874320776   16.443 15.340     ~ 4 0
80 Cl* NGC 2808 PKD 49753 Pe* 09 12 06.86376 -64 51 45.3960   15.669 14.350     ~ 8 0
81 Cl* NGC 2808 PKD 46908 * 09 12 07.02 -64 52 29.7   15.636 14.264     ~ 4 0
82 Cl* NGC 2808 PKD 51918 * 09 12 08.5198 -64 51 11.051   15.626 14.187     ~ 3 0
83 Cl* NGC 2808 PKD 41828 RG* 09 12 08.5587458208 -64 54 00.644854536   15.862 14.521     ~ 10 0
84 Cl* NGC 2808 PKD 52083 * 09 12 08.5727 -64 51 08.436   16.571 15.408     ~ 3 0
85 2MASS J09120887-6455277 RG* 09 12 08.8710554568 -64 55 27.752791476   16.432 15.317   14.032 ~ 12 0
86 Cl* NGC 2808 PKD 38244 RG* 09 12 08.9353073664 -64 56 07.942511184   16.393 15.259   13.961 ~ 14 0
87 Cl* NGC 2808 PKD 47667 * 09 12 09.4977323400 -64 52 17.437419624   15.817 14.444     ~ 6 0
88 Cl* NGC 2808 PKD 46868 * 09 12 09.7828 -64 52 30.452   16.003 14.752     ~ 5 0
89 Cl* NGC 2808 PKD 8826 RG* 09 12 09.8051444016 -64 48 33.218930304   16.250 15.082   13.760 ~ 15 0
90 Cl* NGC 2808 PKD 43247 * 09 12 10.15 -64 53 32.6   16.022 14.786     ~ 5 0
91 Cl* NGC 2808 PKD 55354 * 09 12 10.3400253816 -64 50 16.076926572   16.024 14.749     ~ 5 0
92 Cl* NGC 2808 PKD 39577 * 09 12 10.9834497288 -64 55 03.931896396   15.820 14.509     ~ 8 0
93 Cl* NGC 2808 PKD 44526 * 09 12 10.9877322624 -64 53 09.896033616   16.540 15.459     ~ 3 0
94 Cl* NGC 2808 PKD 43194 * 09 12 11.0537263680 -64 53 33.678658104   15.876 14.595     ~ 4 0
95 Cl* NGC 2808 PKD 55822 * 09 12 12.1875706680 -64 50 07.946488932   16.494 15.421     ~ 5 0
96 Cl* NGC 2808 PKD 52647 * 09 12 12.2891220288 -64 50 59.550838836   15.925 14.654     ~ 5 0
97 Cl* NGC 2808 PKD 37998 RG* 09 12 12.5567032776 -64 56 24.588303036   15.638 14.233     ~ 13 0
98 Cl* NGC 2808 PKD 37781 * 09 12 13.0364308920 -64 56 41.131433040   16.148 15.037     ~ 6 0
99 Cl* NGC 2808 PKD 46520 * 09 12 13.2282232848 -64 52 36.306922368   16.583 15.448     ~ 3 0
100 2MASS J09121334-6448114 RG* 09 12 13.3492296480 -64 48 11.602585332   15.529 14.054   12.468 ~ 10 0
101 Cl* NGC 2808 PKD 50685 * 09 12 13.88160 -64 51 30.6180   15.872 14.551     ~ 7 0
102 Cl* NGC 2808 PKD 37496 RG* 09 12 13.8832846776 -64 57 09.402518592   16.126 14.871     ~ 9 0
103 Cl* NGC 2808 PKD 8603 RG* 09 12 14.0467933080 -64 48 42.899736852   15.847 14.432     ~ 21 0
104 Cl* NGC 2808 PKD 39060 RG* 09 12 14.5240292760 -64 55 24.064654872   15.793 14.417     ~ 9 0
105 Cl* NGC 2808 PKD 56924 RG* 09 12 15.1469583000 -64 49 48.830610504   15.629 14.207     ~ 9 0
106 Cl* NGC 2808 PKD 44665 RG* 09 12 15.2809298856 -64 53 07.334620800   15.649 14.245     ~ 11 0
107 Cl* NGC 2808 PKD 46663 * 09 12 17.1043861656 -64 52 33.907128888   15.860 14.551     ~ 8 0
108 Cl* NGC 2808 PKD 41008 RG* 09 12 17.6783706816 -64 54 19.833491556   16.339 15.189     ~ 16 0
109 Cl* NGC 2808 PKD 42122 * 09 12 17.6851575576 -64 53 54.247447284   16.011 14.708     ~ 3 0
110 Cl* NGC 2808 PKD 44716 RG* 09 12 17.8531045896 -64 53 06.402788448   16.123 14.899     ~ 9 0
111 2MASS J09121810-6451094 AB* 09 12 18.1077432960 -64 51 09.467128872   15.628 14.376   12.990 ~ 15 0
112 Cl* NGC 2808 PKD 7558 RG* 09 12 20.1245103720 -64 49 21.885666384   16.576 15.389     ~ 9 0
113 Cl* NGC 2808 PKD 10105 RG* 09 12 21.1451574840 -64 47 13.889998644   15.958 14.717   13.308 ~ 22 0
114 Cl* NGC 2808 PKD 45443 Pe* 09 12 21.3744174000 -64 52 54.103476720   15.885 14.574     ~ 8 0
115 2MASS J09122151-6450338 RG* 09 12 21.5171100744 -64 50 33.729479556   16.483 15.387   14.101 ~ 13 0
116 Cl* NGC 2808 PKD 50561 Pe* 09 12 23.17056 -64 51 32.5980   16.120 14.834     ~ 7 0
117 Cl* NGC 2808 PKD 42996 RG* 09 12 25.0618461864 -64 53 37.211471376   16.552 15.426     ~ 9 0
118 Cl* NGC 2808 PKD 10341 RG* 09 12 25.4134209432 -64 46 52.398005016   15.997 14.708   13.308 ~ 17 0
119 Cl* NGC 2808 PKD 48001 RG* 09 12 25.6342925184 -64 52 12.073758996   16.408 15.292   13.994 ~ 12 0
120 Cl* NGC 2808 PKD 43794 RG* 09 12 26.3451501936 -64 53 22.581072528   15.861 14.554     ~ 10 0
121 Cl* NGC 2808 PKD 37505 RG* 09 12 26.4240193344 -64 57 08.387830800   16.058 14.783     ~ 14 0
122 2MASS J09122762-6451100 RG* 09 12 27.6381518160 -64 51 10.113163416   15.665 14.270   12.727 ~ 13 0
123 2MASS J09122929-6451188 RG* 09 12 29.2978287624 -64 51 18.908221428   16.207 15.010   13.653 ~ 11 0
124 Cl* NGC 2808 PKD 55609 RG* 09 12 29.9342071224 -64 50 11.369071716   16.084 14.817   13.386 ~ 15 0
125 2MASS J09123015-6449519 RG* 09 12 30.1640751480 -64 49 52.032423864   16.592 15.482   14.178 ~ 13 0
126 Cl* NGC 2808 PKD 38228 RG* 09 12 30.9730576536 -64 56 08.516146560   16.211 14.981     ~ 19 0
127 Cl* NGC 2808 PKD 7536 RG* 09 12 31.6995250872 -64 49 22.267134228   15.769 14.417   12.911 ~ 20 0
128 Cl* NGC 2808 PKD 41688 RG* 09 12 35.2736997528 -64 54 03.783608424   16.293 15.089     ~ 13 0
129 Cl* NGC 2808 PKD 49743 RG* 09 12 36.8014065984 -64 51 45.082943280   16.353 15.168     ~ 20 0
130 Cl* NGC 2808 PKD 38660 RG* 09 12 39.8704213728 -64 55 43.079179836   15.672 14.290     ~ 20 0
131 Cl* NGC 2808 PKD 10571 RG* 09 12 41.1212222904 -64 46 25.847795244   15.806 14.376     ~ 21 0
132 Cl* NGC 2808 PKD 44984 RG* 09 12 45.8811905712 -64 53 01.402724040   15.871 14.597   13.168 ~ 22 0
133 Cl* NGC 2808 PKD 43333 * 09 12 55.0754304576 -64 53 30.397335756   16.570 15.473     ~ 10 0
134 Cl* NGC 2808 PKD 38559 * 09 12 56.1453671544 -64 55 48.354192480   15.541 14.133     ~ 10 0
135 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
136 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
137 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
138 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
139 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
140 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
141 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
142 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
143 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
144 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 561 0
145 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
146 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
147 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
148 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
149 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 562 0
150 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
151 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0

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