2014A&A...563A..13G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:47:56

2014A&A...563A..13G - Astronomy and Astrophysics, volume 563A, 13-13 (2014/3-1)

The Na-O anticorrelation in horizontal branch stars. IV. M 22.

GRATTON R.G., LUCATELLO S., SOLLIMA A., CARRETTA E., BRAGAGLIA A., MOMANY Y., D'ORAZI V., CASSISI S. and SALARIS M.

Abstract (from CDS):

We obtained high-resolution spectra for 94 candidate stars belonging to the HB of M 22 with FLAMES. Previous works have indicated that this cluster has split subgiant (SGB) and red giant branches (RGB) and hosts two different stellar populations, differing in overall metal abundance and both exhibiting a Na-O anti-correlation. The HB stars we observed span a restricted temperature range (7800<Teff<11000K), where about 60% of the HB stars of M 22 are. Within our sample, we can distinguish three groups of stars segregated (though contiguous) in colours: Group 1 (49 stars) is metal-poor, N-normal, Na-poor, and O-rich: our abundances for this (cooler) group match those determined for the primordial group of RGB stars (a third of the total) from previous studies very well. Group 2 (23 stars) is still metal-poor, but it is N- and Na-rich, though only very mildly depleted in O. We can identify this intermediate group as the progeny of the metal-poor RGB stars that occupy an intermediate location along the Na-O anti-correlation and include about 10% of the RGB stars. The third group (20 stars) is metal-rich, Na-rich, and O-rich. This hotter group most likely corresponds to the most O-rich component of the previously found metal-rich RGB population (a quarter of the total). We did not observe any severely O-depleted stars and we think that the progeny of these stars falls on the hotter part of the HB. Furthermore, we found that the metal-rich population is also over-abundant in Sr, in agreement with results for corresponding RGB and SGB stars. However, we do not find any significant variation in the ratio between the sum of N and O abundances to Fe. We do not have C abundances for our stars. There is some evidence of an enhancement of He content for Groups 2 and 3 stars (Y=0.338±0.014±0.05); the error bar due to systematics is large, but a consistent analysis of data for several GCs confirms that stars in these groups within M 22 are probably overabundant in He. We conclude that on the whole, our results agree with the proposition that chemical composition drives the location of stars along the HB of a GC. Furthermore, we found a number of fast rotators. They are concentrated in a restricted temperature range along the HB of M 22. Fast rotating stars might be slightly less massive and bluer than slowly rotating ones, but other interpretations are possible.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - stars: Population II - globular clusters: general - globular clusters: individual: M22

VizieR on-line data: <Available at CDS (J/A+A/563/A13): table3.dat table4.dat table5.dat table6.dat>

Nomenclature: Tables 3-6: [GLS2014] NNN N=92 among (Nos 1-129).

Simbad objects: 101

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Number of rows : 101

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1241 0
3 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1244 0
4 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1771 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1676 0
6 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2006 0
7 2MASS J18353852-2359417 HB* 18 35 38.5257311011 -23 59 41.734013828   14.714 14.415   13.890 ~ 1 0
8 2MASS J18354124-2355448 HB* 18 35 41.2541540804 -23 55 44.835476362   14.774 14.411   13.794 ~ 3 0
9 2MASS J18354187-2349415 HB* 18 35 41.8605122462 -23 49 41.677006985   14.856 14.515   13.922 ~ 1 0
10 [GLS2014] 45 HB* 18 35 50.8416189378 -23 55 14.765298893   14.739 14.350   13.740 ~ 2 0
11 2MASS J18355128-2351379 HB* 18 35 51.2730525921 -23 51 37.998513284   14.821 14.402   13.715 ~ 3 0
12 [GLS2014] 33 HB* 18 35 55.275 -24 03 53.28   14.604 14.302   13.741 ~ 1 0
13 2MASS J18355537-2348075 HB* 18 35 55.3756100263 -23 48 07.496108224   14.795 14.459   13.889 ~ 1 0
14 2MASS J18355646-2354034 HB* 18 35 56.4565573880 -23 54 03.406560385   14.929 14.637   14.142 ~ 1 0
15 2MASS J18355706-2404032 HB* 18 35 57.0675030534 -24 04 03.305787903   14.494 14.171   13.613 ~ 2 0
16 Cl* NGC 6656 SAW V125 HB* 18 35 57.4839499147 -23 47 59.191964818   14.779 14.448   13.966 ~ 4 0
17 2MASS J18360153-2351444 HB* 18 36 01.5259487383 -23 51 44.534958517   14.857 14.424   13.769 ~ 3 0
18 2MASS J18360243-2353385 HB* 18 36 02.4406693941 -23 53 38.579095367   14.780 14.355   13.696 ~ 1 0
19 2MASS J18360706-2351546 HB* 18 36 07.0652322692 -23 51 54.663131049   14.909 14.500   13.835 ~ 1 0
20 NGC 6656 3090 HB* 18 36 07.7263698629 -23 55 43.696318245   14.644 14.247   13.566 ~ 5 0
21 NGC 6656 3054 HB* 18 36 09.8216523571 -23 55 13.483588696   14.724 14.320   13.705 ~ 6 0
22 2MASS J18361032-2359359 HB* 18 36 10.3359854415 -23 59 35.997910495   14.620 14.312   13.785 ~ 1 0
23 [GLS2014] 100 HB* 18 36 10.753 -23 58 14.26   14.810 14.479   14.036 ~ 1 0
24 2MASS J18361148-2358268 HB* 18 36 11.4842368137 -23 58 26.855373183   14.835 14.578   14.148 ~ 1 0
25 [GLS2014] 35 HB* 18 36 12.7992649341 -23 55 39.356569333   14.683 14.314   13.755 ~ 1 0
26 [GLS2014] 61 HB* 18 36 13.3220387697 -24 02 24.121420783   14.730 14.388   13.857 ~ 2 0
27 NGC 6656 3049 HB* 18 36 13.5378567725 -23 55 08.567229865   14.761 14.410   13.854 ~ 4 0
28 [GLS2014] 60 HB* 18 36 13.598 -23 53 37.49   14.813 14.407   13.883 ~ 1 0
29 [GLS2014] 62 HB* 18 36 15.562 -23 57 27.48   14.684 14.389   13.913 ~ 1 0
30 NGC 6656 2025 HB* 18 36 16.3503663403 -23 52 25.962439170   14.977 14.652   14.170 ~ 4 0
31 [GLS2014] 15 HB* 18 36 16.705 -23 58 14.91   14.634 14.231   13.683 ~ 1 0
32 [GLS2014] 26 HB* 18 36 16.7641127616 -23 53 51.339853595   14.770 14.298   13.598 ~ 1 0
33 2MASS J18361781-2355379 HB* 18 36 17.8133112826 -23 55 37.936149616   14.819 14.470   13.946 ~ 1 0
34 [GLS2014] 34 HB* 18 36 17.948 -23 55 01.30   14.777 14.309   13.630 ~ 1 0
35 2MASS J18361800-2352337 HB* 18 36 18.0079248165 -23 52 33.858942086   15.011 14.714   14.245 ~ 1 0
36 [GLS2014] 47 HB* 18 36 18.206 -23 57 45.30   14.655 14.347   13.869 ~ 1 0
37 [GLS2014] 88 HB* 18 36 18.3289720153 -23 54 18.108345217   14.813 14.472   13.968 ~ 1 0
38 NGC 6656 3037 HB* 18 36 18.8927902934 -23 56 49.234479312   14.711 14.250   13.593 ~ 4 0
39 2MASS J18361908-2353174 HB* 18 36 19.0908911982 -23 53 17.358277423   14.821 14.400   13.817 ~ 1 0
40 2MASS J18361938-2348327 HB* 18 36 19.3928845241 -23 48 32.712459914   15.085 14.755   14.293 ~ 1 0
41 2MASS J18362034-2359382 HB* 18 36 20.3490275649 -23 59 38.212552250   14.661 14.283   13.714 ~ 1 0
42 [GLS2014] 23 HB* 18 36 20.376 -23 53 05.33   14.777 14.288   13.617 ~ 1 0
43 NGC 6656 3072 HB* 18 36 20.5672624865 -23 58 39.523874594   14.540 14.202   13.688 ~ 3 0
44 [GLS2014] 63 HB* 18 36 20.846 -23 56 57.78   14.784 14.391   13.829 ~ 1 0
45 2MASS J18362097-2405591 HB* 18 36 20.9799834966 -24 05 59.285903626   14.587 14.193   13.558 ~ 1 0
46 2MASS J18362124-2349075 HB* 18 36 21.2422909253 -23 49 07.618924077   14.882 14.533   14.051 ~ 1 0
47 [GLS2014] 24 HB* 18 36 21.337 -23 55 03.24   14.746 14.277   13.647 ~ 1 0
48 NGC 6656 3068 HB* 18 36 21.4722720030 -23 57 50.538127200   14.882 14.519   13.983 ~ 4 0
49 [GLS2014] 50 HB* 18 36 21.568 -23 55 28.85   14.791 14.370   13.768 ~ 1 0
50 2MASS J18362237-2359429 HB* 18 36 22.3838512608 -23 59 42.979445889   14.627 14.226   13.629 ~ 1 0
51 NGC 6656 3070 HB* 18 36 23.3306077662 -23 58 54.460935025   14.703 14.369   13.856 ~ 3 0
52 2MASS J18362341-2357179 HB* 18 36 23.4208995794 -23 57 18.068201603   14.999 14.697   14.263 ~ 1 0
53 2MASS J18362354-2352341 HB* 18 36 23.5432147179 -23 52 34.190965127   14.820 14.496   14.016 ~ 1 0
54 [GLS2014] 69 HB* 18 36 23.558 -23 56 05.09   14.817 14.408   13.858 ~ 1 0
55 2MASS J18362375-2350160 HB* 18 36 23.7684636603 -23 50 16.273974807   14.781 14.384   13.802 ~ 1 0
56 [GLS2014] 122 HB* 18 36 23.919 -23 55 40.99   15.025 14.652   14.190 ~ 1 0
57 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1217 0
58 2MASS J18362488-2356427 HB* 18 36 24.8885363676 -23 56 42.706616522   14.811 14.430   13.884 ~ 1 0
59 2MASS J18362569-2351436 HB* 18 36 25.7019886736 -23 51 43.777836454   14.996 14.673   14.226 ~ 1 0
60 2MASS J18362587-2351076 HB* 18 36 25.873 -23 51 07.68   14.817 14.454   13.952 ~ 2 0
61 [GLS2014] 96 HB* 18 36 26.041 -23 56 26.47   14.827 14.473   13.962 ~ 1 0
62 [GLS2014] 84 HB* 18 36 26.269 -23 53 17.74   14.861 14.463   13.876 ~ 1 0
63 2MASS J18362642-2355422 HB* 18 36 26.4272565090 -23 55 42.394271788   14.842 14.379   13.750 ~ 1 0
64 [GLS2014] 104 HB* 18 36 26.973 -23 55 51.24   14.889 14.499   13.939 ~ 1 0
65 [GLS2014] 5 HB* 18 36 27.321 -23 51 44.75   14.530 14.204   13.732 ~ 1 0
66 [GLS2014] 8 HB* 18 36 27.716 -23 52 30.85   14.590 14.213   13.669 ~ 1 0
67 2MASS J18362803-2400267 HB* 18 36 28.0446946207 -24 00 26.845228403   14.509 14.090   13.451 ~ 1 0
68 [GLS2014] 107 HB* 18 36 28.185 -23 56 29.13   14.870 14.528   14.035 ~ 1 0
69 2MASS J18362844-2349003 HB* 18 36 28.4363559434 -23 49 00.490707570   15.016 14.624   14.091 ~ 1 0
70 [GLS2014] 124 HB* 18 36 28.648 -23 54 25.44   15.025 14.681   14.199 ~ 1 0
71 [GLS2014] 16 HB* 18 36 29.244 -23 57 02.16   14.614 14.240   13.742 ~ 1 0
72 2MASS J18362935-2400288 HB* 18 36 29.3630488282 -24 00 28.857487299   14.627 14.233   13.639 ~ 3 0
73 [GLS2014] 105 HB* 18 36 29.377 -23 53 11.04   14.854 14.532   14.075 ~ 1 0
74 [GLS2014] 108 HB* 18 36 30.649 -23 54 44.72   14.926 14.541   13.976 ~ 1 0
75 [GLS2014] 39 HB* 18 36 30.809 -23 54 25.39   14.736 14.331   13.741 ~ 1 0
76 2MASS J18363112-2351454 HB* 18 36 31.1258073906 -23 51 45.496533585   14.678 14.262   13.667 ~ 1 0
77 [GLS2014] 90 HB* 18 36 31.683 -23 55 12.21   14.891 14.471   13.871 ~ 1 0
78 2MASS J18363217-2353013 HB* 18 36 32.1811421709 -23 53 01.604784778   14.688 14.292   13.744 ~ 1 0
79 [GLS2014] 14 HB* 18 36 32.397 -23 49 35.22   14.634 14.292   13.796 ~ 1 0
80 [GLS2014] 123 HB* 18 36 33.567 -23 55 00.44   14.975 14.669   14.192 ~ 1 0
81 [GLS2014] 128 HB* 18 36 33.799 -23 52 28.68   15.036 14.716   14.270 ~ 1 0
82 2MASS J18363428-2349311 HB* 18 36 34.2911813399 -23 49 31.248507737   14.846 14.430   13.830 ~ 1 0
83 [GLS2014] 21 HB* 18 36 34.567 -23 54 35.68   14.759 14.266   13.580 ~ 1 0
84 NGC 6656 1076 HB* 18 36 36.4603110428 -23 51 34.864702211   14.822 14.387   13.784 ~ 3 0
85 2MASS J18363736-2359563 HB* 18 36 37.3701134115 -23 59 56.391307973   14.628 14.273   13.723 ~ 3 0
86 2MASS J18363768-2357249 HB* 18 36 37.681 -23 57 24.92   14.760 14.334   13.701 ~ 2 0
87 2MASS J18363819-2348195 HB* 18 36 38.2048785970 -23 48 19.660647602   14.816 14.392   13.779 ~ 3 0
88 [GLS2014] 102 HB* 18 36 40.999 -23 58 31.27   14.887 14.484   13.847 ~ 1 0
89 [GLS2014] 77 HB* 18 36 40.999 -23 58 31.27   14.890 14.484   13.896 ~ 3 0
90 NGC 6656 4094 HB* 18 36 41.8349977808 -23 56 01.774900219   14.874 14.486   13.878 ~ 3 0
91 2MASS J18364442-2352530 HB* 18 36 44.4356246640 -23 52 53.171013466   14.888 14.554   14.084 ~ 3 0
92 2MASS J18364755-2355500 HB* 18 36 47.5527758372 -23 55 50.146120440   14.981 14.623   14.120 ~ 1 0
93 2MASS J18365085-2358045 HB* 18 36 50.8471322591 -23 58 04.549586206   14.879 14.472   13.877 ~ 1 0
94 2MASS J18365433-2353155 HB* 18 36 54.3392553435 -23 53 15.591107865   14.903 14.592   14.129 ~ 3 0
95 [GLS2014] 46 HB* 18 36 54.716 -23 56 02.53   14.777 14.416   13.855 ~ 1 0
96 [GLS2014] 2 HB* 18 37 03.6114726178 -23 58 10.498259580   14.548 14.090   13.416 A 4 0
97 2MASS J18370875-2357170 HB* 18 37 08.7518283161 -23 57 16.960874113   14.810 14.327   13.627 ~ 1 0
98 2MASS J18371430-2358534 HB* 18 37 14.2935079281 -23 58 53.477813027   14.997 14.712   14.271 ~ 1 0
99 2MASS J18371782-2352317 HB* 18 37 17.8217346646 -23 52 31.679830751   14.799 14.428   13.909 ~ 4 0
100 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0
101 NAME Galactic Bulge reg ~ ~           ~ 3387 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:47:56

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