2012A&A...541A..15M

Query : 2012A&A...541A..15M

2012A&A...541A..15M - Astronomy and Astrophysics, volume 541A15-15 (2012/5-1)

The double sub-giant branch of NGC 6656 (M22): a chemical characterization.

MARINO A.F., MILONE A.P., SNEDEN C., BERGEMANN M., KRAFT R.P., WALLERSTEIN G., CASSISI S., APARICIO A., ASPLUND M., BEDIN R.L., HILKER M., LIND K., MOMANY Y., PIOTTO G., ROEDERER I.U., STETSON P.B. and ZOCCALI M.

Abstract (from CDS):

We present an abundance analysis of 101 subgiant branch (SGB) stars in the globular cluster M22. Using low-resolution FLAMES/GIRAFFE spectra we have determined abundances of the neutron-capture strontium and barium and the light element carbon. With these data we explore relationships between the observed SGB photometric split in this cluster and two stellar groups characterized by different contents of iron, slow neutron-capture process (s-process) elements, and the α element calcium, which we previously discovered in M22's red-giant stars. We show that the SGB stars correlate in chemical composition and the color-magnitude diagram position. The stars with higher metallicity and relative s-process abundances define a fainter SGB, while stars with lower metallicity and s-process content reside on a relatively brighter SGB. This result has implications for the relative ages of the two stellar groups of M22. In particular, it is inconsistent with a broad spread in ages of the two SGBs. By accounting for the chemical content of the two stellar groups, isochrone fitting of the double SGB suggests that their ages are not different by more than ∼300Myr.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/541/A15): table2.dat table3.dat>

Nomenclature: Tables 2-3: [MMS2012] NNNN N=101 among (Nos 3-2815).

Simbad objects: 106

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Number of rows : 106
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 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
2 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
4 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
5 [MMS2012] 3 * 18 35 45.23 -23 52 23.7   18.016 17.159   16.049 ~ 1 0
6 2MASS J18355366-2358050 * 18 35 53.66040 -23 58 05.0772   17.943 17.125   16.053 ~ 2 0
7 [BH2018] J279.005292-23.927222 * 18 36 01.27 -23 55 38.0   17.845 16.976   15.839 ~ 2 0
8 [BH2018] J279.011333-23.890167 * 18 36 02.73 -23 53 24.6   18.207 17.330   16.170 ~ 2 0
9 [BH2018] J279.013000-23.875861 * 18 36 03.12 -23 52 33.1   18.082 17.249   15.983 ~ 2 0
10 [BH2018] J279.017042-23.825278 * 18 36 04.0918017720 -23 49 31.394788284   18.091 17.235   16.129 ~ 2 0
11 [BH2018] J279.027333-23.917556 * 18 36 06.55 -23 55 03.2   17.937 17.102   16.029 ~ 2 0
12 [BH2018] J279.043958-23.945139 * 18 36 10.5505840872 -23 56 42.878410044   17.981 17.116   15.969 ~ 2 0
13 Cl* NGC 6656 KHG 31 * 18 36 12.08 -23 51 11.8   18.053 17.225   16.114 ~ 3 0
14 [BH2018] J279.052500-23.930222 * 18 36 12.59 -23 55 48.8 19.689 17.875 16.916   15.704 ~ 2 0
15 [BH2018] J279.052542-23.834000 * 18 36 12.62 -23 50 02.4   17.998 17.160   16.044 ~ 2 0
16 [BH2018] J279.053292-23.882639 * 18 36 12.79 -23 52 57.5 19.857 18.130 17.247   16.089 ~ 2 0
17 [BH2018] J279.054000-23.934111 * 18 36 12.9646686672 -23 56 03.183384696 19.743 17.943 17.046   15.861 ~ 2 0
18 [BH2018] J279.055333-23.875278 * 18 36 13.28 -23 52 31.0 19.773 17.983 17.035   15.822 ~ 2 0
19 [BH2018] J279.055708-23.899361 * 18 36 13.3781224032 -23 53 57.996528288   17.756 16.873   15.738 ~ 2 0
20 [BH2018] J279.056542-23.907500 * 18 36 13.5762404880 -23 54 27.372607416 19.615 17.912 17.064   15.984 ~ 2 0
21 [BH2018] J279.058583-23.872611 * 18 36 14.05 -23 52 21.4 19.388 17.656 16.700   15.466 ~ 2 0
22 [BH2018] J279.060292-23.916111 * 18 36 14.4808123584 -23 54 58.337281260   17.842 16.967   15.839 ~ 2 0
23 [BH2018] J279.062833-23.950306 * 18 36 15.08 -23 57 01.1 19.907 18.049 17.159   16.002 ~ 2 0
24 [BH2018] J279.062833-23.944806 * 18 36 15.08 -23 56 41.3 20.048 18.263 17.424   16.339 ~ 2 0
25 [BH2018] J279.065000-23.975417 * 18 36 15.6025255968 -23 58 31.957467240   17.796 16.913   15.737 ~ 2 0
26 [BH2018] J279.065042-23.924444 * 18 36 15.62 -23 55 28.1 20.054 18.299 17.439   16.227 ~ 2 0
27 [BH2018] J279.067708-23.875861 * 18 36 16.2611233392 -23 52 33.374971632 19.538 17.844 16.905   15.704 ~ 2 0
28 [BH2018] J279.071208-23.902194 * 18 36 17.09 -23 54 07.9 19.567 17.675 16.787   15.624 ~ 2 0
29 [BH2018] J279.072792-23.912500 * 18 36 17.48 -23 54 45.0 20.040 18.267 17.448   16.391 ~ 2 0
30 [BH2018] J279.073083-23.841750 * 18 36 17.53 -23 50 30.3   18.154 17.280   16.140 ~ 2 0
31 [BH2018] J279.073917-23.828222 * 18 36 17.73 -23 49 41.6   18.129 17.237   16.094 ~ 2 0
32 [BH2018] J279.076667-23.884444 * 18 36 18.40 -23 53 04.0 20.021 18.167 17.330   16.192 ~ 2 0
33 [MMS2012] 575 * 18 36 18.60 -23 54 30.1   18.416 17.613   16.572 ~ 1 0
34 [BH2018] J279.078917-23.871972 * 18 36 18.93 -23 52 19.1 19.784 18.035 17.111   15.923 ~ 2 0
35 [MMS2012] 718 * 18 36 19.90 -23 53 55.4   17.543 16.735   15.660 ~ 1 0
36 [BH2018] J279.083208-23.909667 * 18 36 19.96 -23 54 34.8 20.168 18.546 17.756   16.732 ~ 2 0
37 [BH2018] J279.083375-23.883472 * 18 36 20.00 -23 53 00.5 20.079 18.295 17.424   16.264 ~ 2 0
38 [BH2018] J279.083500-23.941222 * 18 36 20.0470535184 -23 56 28.806413316 19.602 17.883 17.024   15.900 ~ 2 0
39 [BH2018] J279.084375-23.933722 * 18 36 20.25 -23 56 01.4 19.684 17.934 17.046   15.897 ~ 2 0
40 [BH2018] J279.085542-23.924500 * 18 36 20.53 -23 55 28.2   18.079 17.303   15.738 ~ 2 0
41 [BH2018] J279.088333-23.892389 * 18 36 21.19 -23 53 32.6   17.974 17.175   16.149 ~ 2 0
42 [BH2018] J279.089917-23.946333 * 18 36 21.56 -23 56 46.8 19.864 18.116 17.259   16.131 ~ 2 0
43 [MMS2012] 972 * 18 36 21.56 -23 53 48.4   17.574 16.724   15.633 ~ 1 0
44 [BH2018] J279.090417-23.875222 * 18 36 21.69 -23 52 30.8 20.137 18.486 17.664   16.568 ~ 2 0
45 [BH2018] J279.091375-23.927389 * 18 36 21.93 -23 55 38.6 19.589 17.891 17.040   15.876 ~ 2 0
46 [BH2018] J279.093333-23.873778 * 18 36 22.40 -23 52 25.6 19.578 17.823 16.919   15.758 ~ 2 0
47 [BH2018] J279.093417-23.910333 * 18 36 22.41 -23 54 37.2   18.548 17.727   16.644 ~ 2 0
48 [MMS2012] 1116 * 18 36 22.42 -23 53 41.5   17.951 17.017   15.795 ~ 1 0
49 [BH2018] J279.094125-23.952222 * 18 36 22.5953522280 -23 57 08.442596304   17.847 16.904   15.721 ~ 2 0
50 [BH2018] J279.097292-23.926083 * 18 36 23.35 -23 55 33.9   18.212 17.396   16.320 ~ 2 0
51 [BH2018] J279.098292-23.877472 * 18 36 23.59 -23 52 38.9 19.680 18.019 17.141   16.041 ~ 2 0
52 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
53 [BH2018] J279.102333-23.915583 * 18 36 24.56 -23 54 56.1   18.267 17.411   16.287 ~ 2 0
54 [BH2018] J279.104083-23.877167 * 18 36 24.98 -23 52 37.8   18.058 17.243   16.167 ~ 2 0
55 [BH2018] J279.106917-23.908806 * 18 36 25.65 -23 54 31.7   18.351 17.379   16.323 ~ 2 0
56 [BH2018] J279.107667-23.876639 * 18 36 25.8546803832 -23 52 36.204158820   18.032 17.184   16.083 ~ 2 0
57 [BH2018] J279.108583-23.905889 * 18 36 26.06 -23 54 21.2   17.710 16.871   15.774 ~ 2 0
58 [BH2018] J279.111167-23.916444 * 18 36 26.68 -23 54 59.2   18.346 17.525   16.404 ~ 2 0
59 [BH2018] J279.111958-23.910111 * 18 36 26.86 -23 54 36.4   18.102 17.200   16.178 ~ 2 0
60 [MMS2012] 1821 * 18 36 27.09 -23 52 14.3   18.203 17.314   16.177 ~ 1 0
61 [BH2018] J279.114708-23.898111 * 18 36 27.53 -23 53 53.2   18.062 17.219   16.117 ~ 2 0
62 [BH2018] J279.115042-23.966861 * 18 36 27.6183955848 -23 58 01.187503356   17.924 17.125   16.039 ~ 2 0
63 [BH2018] J279.115333-23.919000 * 18 36 27.7074129072 -23 55 08.856247944   17.840 16.941   15.797 ~ 2 0
64 [MMS2012] 1924 * 18 36 27.74 -23 53 19.0   17.975 17.088   15.967 ~ 1 0
65 [BH2018] J279.116042-23.903528 * 18 36 27.85 -23 54 12.7   17.920 17.053   15.982 ~ 2 0
66 [BH2018] J279.117750-23.913944 * 18 36 28.26 -23 54 50.2   18.276 17.464   16.340 ~ 2 0
67 [BH2018] J279.117917-23.927861 * 18 36 28.29 -23 55 40.3   18.075 17.146   15.937 ~ 2 0
68 [BH2018] J279.120875-23.893167 * 18 36 29.01 -23 53 35.4   17.905 17.139   16.071 ~ 2 0
69 [BH2018] J279.122292-23.935889 * 18 36 29.36 -23 56 09.2   18.140 17.274   16.152 ~ 2 0
70 [BH2018] J279.124125-23.882056 * 18 36 29.78 -23 52 55.4   18.103 17.238   16.141 ~ 2 0
71 2MASS J18362990-2359046 * 18 36 29.90016 -23 59 04.6500   17.965 17.085   15.964 ~ 2 0
72 [BH2018] J279.125083-23.930028 * 18 36 30.02 -23 55 48.1   18.173 17.280   16.131 ~ 2 0
73 [BH2018] J279.126042-23.873750 * 18 36 30.25 -23 52 25.5   18.043 17.175   16.083 ~ 2 0
74 [BH2018] J279.126167-23.925972 * 18 36 30.28 -23 55 33.5   18.224 17.391   16.298 ~ 2 0
75 2MASS J18363028-2350353 * 18 36 30.28368 -23 50 35.3436   17.808 16.933   15.778 ~ 2 0
76 [BH2018] J279.127708-23.972472 * 18 36 30.65 -23 58 20.9   17.978 17.178   16.073 ~ 2 0
77 [MMS2012] 2278 * 18 36 30.98 -23 53 59.7   17.888 17.049   15.968 ~ 1 0
78 [BH2018] J279.129792-23.872389 * 18 36 31.1583835536 -23 52 20.929150452   17.999 17.206   16.150 ~ 2 0
79 2MASS J18363134-2352590 * 18 36 31.3249657584 -23 52 58.572293520   17.776 16.931   15.882 ~ 2 0
80 [BH2018] J279.130667-23.896611 * 18 36 31.35 -23 53 47.8   17.979 17.140   16.085 ~ 2 0
81 [MMS2012] 2321 * 18 36 31.41 -23 57 44.3   17.664 16.777   15.621 ~ 1 0
82 [MMS2012] 2334 * 18 36 31.55 -23 53 12.0   17.980 17.066   15.937 ~ 1 0
83 [BH2018] J279.132083-23.890500 * 18 36 31.69 -23 53 25.8   18.150 17.380   16.373 ~ 2 0
84 [BH2018] J279.133000-24.004917 * 18 36 31.92 -24 00 17.7   17.860 16.960   15.792 ~ 2 0
85 [BH2018] J279.135417-23.927083 * 18 36 32.50 -23 55 37.5   17.917 16.999   15.796 ~ 2 0
86 [BH2018] J279.136250-24.017139 * 18 36 32.70 -24 01 01.7   18.087 17.257   16.152 ~ 2 0
87 2MASS J18363308-2357102 * 18 36 33.08328 -23 57 10.2348   18.165 17.294   16.189 ~ 2 0
88 [MMS2012] 2419 * 18 36 33.20 -23 57 58.6   17.985 17.141   16.058 ~ 1 0
89 2MASS J18363326-2350141 * 18 36 33.26424 -23 50 14.1828   18.108 17.252   16.065 ~ 2 0
90 [BH2018] J279.145250-23.841861 * 18 36 34.86 -23 50 30.7   18.039 17.199   16.090 ~ 2 0
91 2MASS J18363565-2357585 * 18 36 35.6596208328 -23 57 58.373156232   18.136 17.303   16.210 ~ 2 0
92 2MASS J18363681-2355469 * 18 36 36.8257989312 -23 55 47.041175244   18.041 17.105   15.882 ~ 2 0
93 [BH2018] J279.153583-23.840306 * 18 36 36.8651585976 -23 50 25.497536280   18.004 17.137   15.998 ~ 2 0
94 2MASS J18363823-2351128 * 18 36 38.23800 -23 51 12.8952   17.961 17.133   16.012 ~ 2 0
95 [BH2018] J279.159750-23.880833 * 18 36 38.33 -23 52 51.0   18.001 17.159   16.065 ~ 2 0
96 2MASS J18363903-2358084 * 18 36 39.03144 -23 58 08.4828   18.043 17.113   15.888 ~ 2 0
97 2MASS J18363987-2354027 * 18 36 39.87432 -23 54 02.7504   18.264 17.393   16.267 ~ 2 0
98 2MASS J18364061-2354207 * 18 36 40.61808 -23 54 20.7900   18.030 17.090   15.884 ~ 2 0
99 2MASS J18364107-2351223 * 18 36 41.0752172880 -23 51 22.444212420   18.049 17.228   16.109 ~ 2 0
100 2MASS J18364259-2352503 * 18 36 42.59808 -23 52 50.3868   18.058 17.141   15.996 ~ 2 0
101 2MASS J18364324-2353192 * 18 36 43.24488 -23 53 19.2264   18.080 17.207   16.078 ~ 2 0
102 2MASS J18364421-2348319 * 18 36 44.21688 -23 48 31.9392   17.976 17.073   15.897 ~ 2 0
103 2MASS J18364462-2349457 * 18 36 44.62848 -23 49 45.7968   17.783 16.874   15.697 ~ 2 0
104 [BH2018] J279.190292-23.906000 * 18 36 45.6668670504 -23 54 22.162056084   18.274 17.377   16.209 ~ 2 0
105 [MMS2012] 2801 * 18 36 59.1982066128 -23 52 17.204032452   17.913 17.049   15.914 ~ 1 0
106 [MMS2012] 2815 * 18 37 03.7110557280 -23 49 57.106902612   17.932 17.009   15.824 ~ 1 0

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