2009A&A...505.1099M


Query : 2009A&A...505.1099M

2009A&A...505.1099M - Astronomy and Astrophysics, volume 505, 1099-1113 (2009/10-3)

A double stellar generation in the globular cluster NGC 6656 (M 22). Two stellar groups with different iron and s-process element abundances.

MARINO A.F., MILONE A.P., PIOTTO G., VILLANOVA S., BEDIN L.R., BELLINI A. and RENZINI A.

Abstract (from CDS):

We present a chemical abundance analysis based on high resolution UVES spectra of seventeen bright giant stars in the Globular Cluster (GC) M 22. We obtained an average iron abundance of [Fe/H]=-1.76±0.02 (internal errors only) and an α enhancement of 0.36±0.04 (internal errors only). Na and O, and Al and O follow the well known anticorrelations found in many other GCs. We identified two groups of stars with significantly different abundances of the s-process elements Y, Zr, and Ba. The relative numbers of the two group members are very similar to the ratio of the number of stars in the two sub giant branches (SGB) of M 22. Y and Ba abundances do not correlate with Na, O, and Al. The s-element rich stars are also richer in iron and have higher Ca abundances. The results from high resolution spectra were confirmed by analyses of lower resolution GIRAFFE spectra of fourteen additional M 22 stars. The analyses of the GIRAFFE spectra also show that the Eu - a pure r-process element - abundance is not related to the iron content. We discuss the chemical abundance pattern of M 22 stars in the context of GC multiple stellar populations phenomenon.

Abstract Copyright:

Journal keyword(s): stars: abundances - galaxy: globular clusters: individual: NGC 6656

Nomenclature: Table 1: [MMP2009b] NNNNNN N=17 among (Nos 71-200104).

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3722 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1329 0
3 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1332 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3229 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1757 0
6 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2099 0
7 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 860 1
8 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1876 1
9 NGC 6656 2104 * 18 36 07.7194579176 -23 50 55.712368788   13.7458 12.3171   10.6334 ~ 10 0
10 NGC 6656 3052 * 18 36 10.1880699192 -23 54 22.149836316   13.2488 11.5217   9.6761 ~ 33 0
11 NGC 6656 3050 * 18 36 13.4362325544 -23 54 55.593736236   14.6701 13.4704 13.53 12.0023 ~ 8 0
12 NGC 6656 3003 * 18 36 17.5180920480 -23 54 26.583103224   12.8797 11.0304   9.0975 ~ 30 0
13 NGC 6656 3033 * 18 36 20.1391362096 -23 56 45.989405016   13.6269 12.2122   10.5598 ~ 13 0
14 NGC 6656 3025 * 18 36 20.1714578232 -23 55 54.280178832   13.9028 12.6644 12.72 11.1595 ~ 11 0
15 NGC 6656 3035 * 18 36 20.5188035040 -23 56 24.807406452   13.7089 12.3647   10.7539 ~ 15 0
16 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1295 0
17 NGC 6656 4020 * 18 36 25.9951256040 -23 55 58.727655408   13.6157 12.0413   10.3165 ~ 30 0
18 NGC 6656 1012 * 18 36 27.3693642144 -23 51 26.472598488   13.19 11.76   9.9282 ~ 26 0
19 NGC 6656 1027 * 18 36 30.5925927744 -23 52 48.890051724   13.54 12.37   10.8732 ~ 14 0
20 NGC 6656 1086 * 18 36 32.1422845440 -23 51 31.749823080   13.7589 12.2961   10.6084 ~ 21 0
21 NGC 6656 4059 * 18 36 32.1668419872 -23 56 04.352982504   13.4254 11.9082 11.20 10.19 ~ 18 0
22 NGC 6656 1085 * 18 36 32.8348019856 -23 51 11.228277816   13.7257 12.4310   10.8985 ~ 18 0
23 NGC 6656 4068 * 18 36 32.8909473864 -23 54 58.738000932   14.6746 13.4606 13.45 11.9562 ~ 5 0
24 NGC 6656 1080 * 18 36 36.0715153344 -23 50 16.490712264   13.9042 12.5003   10.9469 ~ 18 0
25 NGC 6656 1053 * 18 36 38.3696670480 -23 54 01.747368108   14.051 12.690   11.0746 ~ 19 0
26 NGC 6656 4097 * 18 36 41.0626578168 -23 58 19.486392024   12.799 10.9295   8.9453 ~ 37 0
27 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1894 0
28 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1072 0
29 NAME Galactic Bulge reg ~ ~           ~ 3844 0

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2022.05.20-08:51:51

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