2016A&A...592A..66W


Query : 2016A&A...592A..66W

2016A&A...592A..66W - Astronomy and Astrophysics, volume 592A, 66-66 (2016/8-1)

Sodium abundances of AGB and RGB stars in Galactic globular clusters. I. Analysis and results of NGC 2808.

WANG Y., PRIMAS F., CHARBONNEL C., VAN DER SWAELMEN M., BONO G., CHANTEREAU W. and ZHAO G.

Abstract (from CDS):

Context. Galactic globular clusters (GC) are known to have multiple stellar populations and be characterised by similar chemical features, e.g. O-Na anti-correlation. While second-population stars, identified by their Na overabundance, have been found from the main sequence turn-off up to the tip of the red giant branch (RGB) in various Galactic GCs, asymptotic giant branch (AGB) stars have rarely been targeted. The recent finding that NGC 6752 lacks an Na-rich AGB star has thus triggered new studies on AGB stars in GCs, since this result questions our basic understanding of GC formation and stellar evolution theory.
Aims. We aim to compare the Na abundance distributions of AGB and RGB stars in Galactic GCs and investigate whether the presence of Na-rich stars on the AGB is metallicity-dependent.
Methods. With high-resolution spectra obtained with the multi-object high-resolution spectrograph FLAMES on ESO/VLT, we derived accurate Na abundances for 31 AGB and 40 RGB stars in the Galactic GC NGC 2808.
Results. We find that NGC 2808 has a mean metallicity of -1.11±0.08dex, in good agreement with earlier analyses. Comparable Na abundance dispersions are derived for our AGB and RGB samples, with the AGB stars being slightly more concentrated than the RGB stars. The ratios of Na-poor first-population to Na-rich second-population stars are 45:55 in the AGB sample and 48:52 in the RGB sample.
Conclusions. NGC 2808 has Na-rich second-population AGB stars, which turn out to be even more numerous - in relative terms - than their Na-poor AGB counterparts and the Na-rich stars on the RGB. Our findings are well reproduced by the fast rotating massive stars scenario and they do not contradict the recent results that there is not an Na-rich AGB star in NGC 6752. NGC 2808 thus joins the larger group of Galactic GCs for which Na-rich second-population stars on the AGB have recently been found.

Abstract Copyright: © ESO, 2016

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

VizieR on-line data: <Available at CDS (J/A+A/592/A66): table2.dat table4.dat table6.dat>

Nomenclature: Tables 2, 4, 6: [WPC2016] NGC 2808 AGBNNNNNN N=33 among (Nos 27408-130828), [WPC2016] NGC 2808 RGBNNNNNN N=40 among (Nos 32845-138158).

Simbad objects: 81

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Number of rows : 81
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     ~ 3652 0
2 [WPC2016] NGC 2808 AGB27408 AB* 09 10 40.8709912533 -64 53 27.865732162   16.035 14.961   13.678 ~ 1 0
3 2MASS J09110169-6451360 RG* 09 11 01.6894968435 -64 51 36.042801310   15.784 14.417   12.925 ~ 10 0
4 [WPC2016] NGC 2808 AGB37108 AB* 09 11 13.3884163319 -64 57 57.502359379   16.330 15.317   14.126 ~ 1 0
5 2MASS J09111437-6453359 RG* 09 11 14.3688705266 -64 53 36.038311129   16.425 15.305   14.038 ~ 7 0
6 [WPC2016] NGC 2808 AGB41080 AB* 09 11 22.0263818529 -64 54 10.049355193   16.334 15.296   14.068 ~ 1 0
7 2MASS J09112270-6450120 RG* 09 11 22.7193476059 -64 50 12.040280637   16.551 15.377   14.017 ~ 5 0
8 [WPC2016] NGC 2808 RGB42139 RG* 09 11 24.2589850146 -64 46 04.524091720   15.892 14.601   13.199 ~ 1 0
9 2MASS J09112522-6450535 RG* 09 11 25.2339876129 -64 50 53.544451910   16.581 15.435   14.110 ~ 5 0
10 2MASS J09113076-6453377 AB* 09 11 30.7663010342 -64 53 37.750290356   15.369 13.998   12.520 ~ 4 0
11 2MASS J09113162-6454579 RG* 09 11 31.6222498847 -64 54 58.009335310   15.946 14.694   13.345 ~ 10 0
12 2MASS J09113161-6449022 RG* 09 11 31.6291646855 -64 49 02.248406442   16.612 15.449   14.093 ~ 7 0
13 [WPC2016] NGC 2808 AGB55657 AB* 09 11 41.4444298862 -64 54 03.589465010   15.748 14.610   13.292 ~ 1 0
14 [WPC2016] NGC 2808 RGB56595 RG* 09 11 42.5028506627 -64 50 02.118814005   15.673 14.283   12.733 ~ 1 0
15 2MASS J09114635-6450261 RG* 09 11 46.3532535151 -64 50 26.106056611   16.090 14.853   13.455 ~ 5 0
16 2MASS J09114655-6452144 AB* 09 11 46.5592688544 -64 52 14.519569979   15.471 14.177   12.757 ~ 2 0
17 2MASS J09115085-6456376 RG* 09 11 50.8521574867 -64 56 37.681216942   16.546 15.428   14.154 ~ 6 0
18 2MASS J09115118-6448375 RG* 09 11 51.2017777644 -64 48 37.535540247   15.721 14.332   12.779 ~ 11 0
19 GES J09115269-6454381 RG* 09 11 52.6878995023 -64 54 38.077557072   16.732 15.659   14.442 ~ 3 0
20 [WPC2016] NGC 2808 AGB67867 AB* 09 11 52.7393093110 -64 51 35.766218696   15.651 14.545   13.272 ~ 1 0
21 [WPC2016] NGC 2808 AGB68232 AB* 09 11 53.0277461943 -64 53 25.443040009   15.677 14.470   13.094 ~ 1 0
22 [WPC2016] NGC 2808 AGB70476 AB* 09 11 55.051 -64 51 04.14   16.063 14.958   13.688 ~ 1 0
23 [WPC2016] NGC 2808 AGB70933 AB* 09 11 55.510 -64 50 22.30   16.456 15.480   14.260 ~ 1 0
24 [WPC2016] NGC 2808 AGB71553 AB* 09 11 55.988 -64 52 23.74   15.677 14.461   13.099 ~ 1 0
25 2MASS J09115667-6447004 RG* 09 11 56.6800073929 -64 47 00.526509180   15.711 14.359   12.886 ~ 6 0
26 2MASS J09115719-6449144 RG* 09 11 57.1964684514 -64 49 14.567293181   16.202 14.974   13.578 ~ 6 0
27 [WPC2016] NGC 2808 AGB74216 AB* 09 11 58.230 -64 52 05.12   15.141 13.701   12.133 ~ 1 0
28 2MASS J09115856-6447230 RG* 09 11 58.5643497611 -64 47 23.126312269   15.651 14.266   12.761 ~ 6 0
29 2MASS J09115856-6448591 RG* 09 11 58.5762099155 -64 48 59.279286507   16.376 15.169   13.792 ~ 5 0
30 2MASS J09115869-6451285 LP* 09 11 58.698 -64 51 28.50   15.034 13.646   12.123 ~ 3 0
31 [WPC2016] NGC 2808 RGB76242 RG* 09 11 59.8608141280 -64 55 15.696038884   16.709 15.631   14.359 ~ 2 0
32 [WPC2016] NGC 2808 AGB79912 AB* 09 12 02.9702007870 -64 55 29.190570839   16.290 15.264   14.028 ~ 1 0
33 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1295 0
34 [WPC2016] NGC 2808 AGB83105 AB* 09 12 05.694 -64 51 16.94   15.156 13.863   12.362 ~ 1 0
35 [WPC2016] NGC 2808 AGB83774 AB* 09 12 06.270 -64 50 41.60   15.860 14.691   13.381 ~ 1 0
36 [WPC2016] NGC 2808 AGB83879 AB* 09 12 06.350 -64 51 35.40   15.151 13.789   12.304 ~ 1 0
37 [WPC2016] NGC 2808 AGB83910 AB* 09 12 06.379 -64 50 58.46   15.511 14.333   12.984 ~ 1 0
38 2MASS J09120655-6453492 AB* 09 12 06.5549568723 -64 53 49.345523298   15.833 14.754   13.494 ~ 4 0
39 [WPC2016] NGC 2808 AGB86111 AB* 09 12 08.218 -64 50 15.80   15.470 14.311   12.992 ~ 1 0
40 [WPC2016] NGC 2808 AGB86159 AB* 09 12 08.261 -64 51 19.22   15.662 14.437   13.064 ~ 1 0
41 2MASS J09120887-6455277 RG* 09 12 08.8710779931 -64 55 27.753344187   16.432 15.317   14.032 ~ 5 0
42 2MASS J09120894-6456078 RG* 09 12 08.9354185078 -64 56 07.942223774   16.393 15.259   13.961 ~ 5 0
43 [WPC2016] NGC 2808 AGB87790 AB* 09 12 09.687 -64 47 38.34   16.391 15.388   14.186 ~ 1 0
44 2MASS J09120979-6448331 RG* 09 12 09.8051019725 -64 48 33.219186627   16.250 15.082   13.760 ~ 6 0
45 [WPC2016] NGC 2808 AGB88250 AB* 09 12 10.040 -64 51 25.70   16.128 15.099   13.918 ~ 1 0
46 [WPC2016] NGC 2808 AGB88521 AB* 09 12 10.245 -64 52 31.51   14.898 13.462   11.937 ~ 1 0
47 [WPC2016] NGC 2808 RGB90144 RG* 09 12 11.6802192937 -64 49 03.596567809   16.688 15.563   14.256 ~ 1 0
48 [WPC2016] NGC 2808 AGB90362 AB* 09 12 11.7862283791 -64 54 46.155251955   16.042 14.943   13.660 ~ 1 0
49 2MASS J09121334-6448114 RG* 09 12 13.3491027619 -64 48 11.603153345   15.529 14.054   12.468 ~ 6 0
50 [WPC2016] NGC 2808 AGB93549 AB* 09 12 14.4551781146 -64 49 29.545367800   16.304 15.349   14.172 ~ 1 0
51 [WPC2016] NGC 2808 AGB94048 AB* 09 12 14.841 -64 51 52.02   15.944 14.809   13.500 ~ 1 0
52 [WPC2016] NGC 2808 AGB96817 AB* 09 12 17.230 -64 53 56.10   16.335 15.285   14.055 ~ 1 0
53 [WPC2016] NGC 2808 AGB96860 AB* 09 12 17.3027808487 -64 46 04.801394638   15.993 14.945   13.710 ~ 1 0
54 2MASS J09121810-6451094 AB* 09 12 18.1071694841 -64 51 09.464538152   15.628 14.376   12.990 ~ 7 0
55 [WPC2016] NGC 2808 AGB99809 AB* 09 12 19.7118353601 -64 43 55.817096760   16.377 15.367   14.156 ~ 1 0
56 2MASS J09122113-6447138 RG* 09 12 21.1451585667 -64 47 13.889622287   15.958 14.717   13.308 ~ 10 0
57 2MASS J09122151-6450338 RG* 09 12 21.5169494690 -64 50 33.728896487   16.483 15.387   14.101 ~ 6 0
58 2MASS J09122307-6456341 RG* 09 12 23.0717455156 -64 56 34.288396463   15.345 13.737   12.048 ~ 10 0
59 2MASS J09122540-6446523 RG* 09 12 25.4134149276 -64 46 52.399310918   15.997 14.708   13.308 ~ 7 0
60 2MASS J09122561-6452120 RG* 09 12 25.6344672720 -64 52 12.074061548   16.408 15.292   13.994 ~ 3 0
61 2MASS J09122762-6451100 RG* 09 12 27.6382359522 -64 51 10.113227835   15.665 14.270   12.727 ~ 6 0
62 [WPC2016] NGC 2808 RGB109598 RG* 09 12 28.7129034501 -64 44 16.874683211   16.295 15.136   13.822 ~ 1 0
63 2MASS J09122929-6451188 RG* 09 12 29.2978504931 -64 51 18.907557629   16.207 15.010   13.653 ~ 6 0
64 2MASS J09122993-6450113 RG* 09 12 29.9343516922 -64 50 11.370381422   16.084 14.817   13.386 ~ 6 0
65 2MASS J09123015-6449519 RG* 09 12 30.1639767248 -64 49 52.037528956   16.592 15.482   14.178 ~ 6 0
66 2MASS J09123016-6454129 AB* 09 12 30.1737024464 -64 54 12.940812656   15.863 14.809   13.568 ~ 2 0
67 2MASS J09123168-6449222 RG* 09 12 31.6995442240 -64 49 22.266487921   15.769 14.417   12.911 ~ 10 0
68 GES J09123278-6444437 RG* 09 12 32.7871551740 -64 44 43.851476789   16.311 15.086   13.702 ~ 3 0
69 [WPC2016] NGC 2808 RGB115638 RG* 09 12 35.3683299644 -64 52 45.296312081   16.768 15.695   14.442 ~ 1 0
70 2MASS J09124003-6453358 RG* 09 12 40.0496620941 -64 53 35.916409428   15.338 13.786   12.103 ~ 3 0
71 [WPC2016] NGC 2808 RGB120382 RG* 09 12 41.3543585349 -64 48 43.356171923   16.501 15.453   14.198 ~ 1 0
72 2MASS J09124587-6453014 RG* 09 12 45.8812752389 -64 53 01.402490279   15.871 14.597   13.168 ~ 10 0
73 2MASS J09130118-6452430 AB* 09 13 01.1992759027 -64 52 43.034135510   16.151 15.106   13.863 ~ 3 0
74 [WPC2016] NGC 2808 RGB134256 RG* 09 13 09.8167880174 -64 52 46.641026947   16.379 15.214   13.876 ~ 1 0
75 [WPC2016] NGC 2808 RGB138158 RG* 09 13 20.8715214838 -64 47 44.675035908   16.062 14.791   13.345 ~ 1 0
76 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2325 0
77 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1828 0
78 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2061 0
79 M 62 GlC 17 01 12.60 -30 06 44.5   8.55 7.39     ~ 540 0
80 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1855 0
81 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 935 1

    Equat.    Gal    SGal    Ecl

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2021.07.25-15:47:09

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