2011A&A...532A...8M

Query : 2011A&A...532A...8M

2011A&A...532A...8M - Astronomy and Astrophysics, volume 532A, 8-8 (2011/8-1)

The two metallicity groups of the globular cluster M 22: a chemical perspective.

MARINO A.F., SNEDEN C., KRAFT R.P., WALLERSTEIN G., NORRIS J.E., DA COSTA G., MILONE A.P., IVANS I.I., GONZALEZ G., FULBRIGHT J.P., HILKER M., PIOTTO G., ZOCCALI M. and STETSON P.B.

Abstract (from CDS):

We present a detailed chemical composition analysis of 35 red giant stars in the globular cluster M22. High resolution spectra for this study were obtained at five observatories, and analyzed in a uniform manner. We have determined abundances of representative light proton-capture, α, Fe-peak and neutron-capture element groups. Our aim is to better understand the peculiar chemical enrichment history of this cluster, in which two stellar groups are characterized by a different content in iron, neutron capture elements Y, Zr and Ba, and α element Ca. The principal results of this study are: (i) substantial star-to-star metallicity scatter (-2.0≲[Fe/H]≲-1.6); (ii) enhancement of s-process/r-process neutron-capture abundance ratios in a fraction of giants, positively correlated with metallicity; (iii) sharp separation between the s-process-rich and s-process-poor groups by [La/Eu] ratio; (iv) possible increase of [Cu/Fe] ratios with increasing [Fe/H], suggesting that this element also has a significant s-process component; and (v) presence of Na-O and C-N anticorrelations in both the stellar groups.

Abstract Copyright: ∼

Journal keyword(s): techniques: spectroscopic - stars: abundances - stars: Population II - globular clusters: individual: M22 (NGC 6656)

CDS comments: Table 2 star C is 2MASS J18361022-2348444.

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1430 0
2 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 932 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
4 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1978 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1850 0
6 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 847 1
7 Cl* NGC 6656 PG 9 * 18 35 50.0239606896 -23 57 41.740951212   13.052 11.356   9.567 A5 6 0
8 NGC 6656 3096 * 18 36 02.1971307408 -23 56 50.543629044   13.511 12.138   10.575 ~ 9 0
9 NGC 6656 2104 * 18 36 07.7194579176 -23 50 55.712368788   13.7458 12.3171   10.6334 ~ 10 0
10 NGC 6656 2031 * 18 36 09.9313167888 -23 52 52.920794064   13.436 11.927 11.41 11.927 ~ 23 0
11 NGC 6656 3052 * 18 36 10.1880699192 -23 54 22.149836316   13.2488 11.5217   9.6761 ~ 33 0
12 DENIS J183610.1-234844 LP? 18 36 10.2172374768 -23 48 44.677062648   13.309 11.309 10.54 9.35 ~ 4 0
13 NGC 6656 3050 * 18 36 13.4362325544 -23 54 55.593736236   14.6701 13.4704 13.53 12.0023 ~ 8 0
14 NGC 6656 3012 * 18 36 14.2688646888 -23 54 31.402104804   13.236 11.540   9.723 ~ 23 0
15 NGC 6656 3047 * 18 36 14.8021476672 -23 55 16.019781312   13.699 12.385 11.78 10.848 ~ 7 0
16 NGC 6656 3014 * 18 36 15.1036106568 -23 54 54.906835572   12.40 10.93   9.145 ~ 20 0
17 NGC 6656 3015 * 18 36 15.6175331280 -23 55 01.580436012   13.057 11.362   9.484 ~ 12 0
18 NGC 6656 2096 * 18 36 17.2424729856 -23 54 11.604246840   13.134 11.604   9.879 ~ 8 0
19 2MASS J18361751-2354263 LP* 18 36 17.5180920480 -23 54 26.583103224   12.8797 11.0304   9.0975 ~ 31 0
20 NGC 6656 3033 * 18 36 20.1391362096 -23 56 45.989405016   13.6269 12.2122   10.5598 ~ 14 0
21 NGC 6656 3025 * 18 36 20.1714578232 -23 55 54.280178832   13.9028 12.6644 12.72 11.1595 ~ 11 0
22 NGC 6656 3035 * 18 36 20.5188035040 -23 56 24.807406452   13.7089 12.3647   10.7539 ~ 15 0
23 NGC 6656 2001 * 18 36 23.8609766832 -23 52 44.254659540   13.585 12.043 11.45 10.367 ~ 7 0
24 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1379 0
25 NGC 6656 4020 * 18 36 25.9951256040 -23 55 58.727655408   13.6157 12.0413   10.3165 ~ 31 0
26 NGC 6656 1012 * 18 36 27.3693642144 -23 51 26.472598488   13.19 11.76   9.9282 ~ 26 0
27 NGC 6656 5002 * 18 36 27.9809099904 -23 55 02.189994312   13.260 11.498 10.85 9.674 ~ 6 0
28 NGC 6656 1037 * 18 36 30.0312412200 -23 53 50.463927528   13.450 12.008   10.372 ~ 8 0
29 NGC 6656 1036 * 18 36 30.0808902216 -23 53 37.862908908   13.342 11.931   10.320 ~ 9 0
30 NGC 6656 1027 * 18 36 30.5925927744 -23 52 48.890051724   13.54 12.37   10.8732 ~ 14 0
31 NGC 6656 1086 * 18 36 32.1422845440 -23 51 31.749823080   13.7589 12.2961   10.6084 ~ 21 0
32 NGC 6656 4059 * 18 36 32.1668419872 -23 56 04.352982504   13.4254 11.9082 11.20 10.19 ~ 18 0
33 2MASS J18363282-2351112 AB* 18 36 32.8348019856 -23 51 11.228277816   13.7257 12.4310   10.8985 ~ 20 0
34 NGC 6656 4068 * 18 36 32.8909473864 -23 54 58.738000932   14.6746 13.4606 13.45 11.9562 ~ 5 0
35 NGC 6656 1092 * 18 36 33.2884633608 -23 52 32.858872716   13.141 11.561   9.828 ~ 27 0
36 NGC 6656 4076 * 18 36 35.4140436264 -23 54 40.350386988   13.709 12.299   10.790 ~ 8 0
37 NGC 6656 1080 * 18 36 36.0715153344 -23 50 16.490712264   13.9042 12.5003   10.9469 ~ 19 0
38 Cl* NGC 6656 ALC 3107 LP? 18 36 36.1972212960 -23 59 39.467606388   12.70 11.17   9.111 ~ 29 0
39 NGC 6656 1057 * 18 36 38.2771221672 -23 53 13.429969728   13.578 11.981   10.290 ~ 11 0
40 NGC 6656 1053 * 18 36 38.3696670480 -23 54 01.747368108   14.051 12.690   11.0746 ~ 19 0
41 Cl* NGC 6656 ALC 3113 LP? 18 36 41.0626578168 -23 58 19.486392024   12.799 10.9295   8.9453 ~ 38 0
42 NGC 6656 4088 * 18 36 44.9664628680 -23 54 57.774666708   13.718 12.228   10.608 ~ 8 0
43 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1069 0
44 NAME Galactic Bulge reg ~ ~           ~ 4299 0

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