2014A&A...561A..87C

Query : 2014A&A...561A..87C

2014A&A...561A..87C - Astronomy and Astrophysics, volume 561A87-87 (2014/1-1)

Terzan 8 : a Sagittarius-flavoured globular cluster.

CARRETTA E., BRAGAGLIA A., GRATTON R.G., D'ORAZI V., LUCATELLO S. and SOLLIMA A.

Abstract (from CDS):

Massive globular clusters (GCs) contain at least two generations of stars with slightly different ages and clearly distinct light element abundances. The Na-O anticorrelation is the best studied chemical signature of multiple stellar generations. Instead, low-mass clusters usually appear to be chemically homogeneous. We are investigating low-mass GCs to understand what the lower mass limit is where multiple populations can form, mainly using the Na and O abundance distribution. We used VLT/FLAMES spectra of giants in the low-mass, metal-poor GC Terzan 8 that belongs to the Sagittarius dwarf galaxy to determine abundances of Fe, O, Na, α-, Fe-peak, and neutron-capture elements in six stars observed with UVES and 14 observed with GIRAFFE. The average metallicity is [Fe/H] = -2.27±0.03 (rms = 0.08), based on the six high-resolution UVES spectra. Only one star, observed with GIRAFFE, shows an enhanced abundance of Na and we tentatively assign it to the second generation. In this cluster, unlike what happens in more massive GCs, the second generation seems to represent at most a minority fraction. We discuss the implications of our findings, comparing Terzan 8 with the other Sgr dSph GCs, and to GCs and field stars in the Large Magellanic Cloud, Fornax, and in other dwarfs galaxies.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: Population II - globular clusters: general - globular clusters: individual: Terzan 8 - atmospheres stars:

VizieR on-line data: <Available at CDS (J/A+A/561/A87): table2.dat>

Simbad objects: 125

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Number of rows : 125
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 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 177 0
2 NAME Fornax H1 Cl* 02 37 02.1 -34 11 00     16.59     ~ 107 0
3 NAME Fornax H2 GlC 02 38 44.24 -34 48 30.5   14.5       ~ 93 0
4 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 131 0
5 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
6 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 Cl Berkeley 29 OpC 06 53 03.6 +16 55 24   14.3       ~ 187 0
9 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
10 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
11 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
12 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
13 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
14 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
15 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 333 0
16 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
17 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
18 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
19 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
20 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 384 0
21 Cl* Terzan 8 MBF 3014 * 19 41 23.7150580080 -33 56 03.606550152     15.447   14.082 ~ 2 0
22 Cl* Terzan 8 MBF 1201 * 19 41 25.6794579744 -34 00 34.329370968     17.216   16.090 ~ 2 0
23 Cl* Terzan 8 MBF 2309 * 19 41 27.0815781192 -33 58 34.869284112     18.082   17.092 ~ 2 0
24 Cl* Terzan 8 MBF 2187 HB* 19 41 27.4912719432 -33 58 51.434814756     18.855   18.760 ~ 2 0
25 Cl* Terzan 8 MBF 841 * 19 41 28.8939242424 -34 01 14.348051328     18.549   17.542 ~ 2 0
26 Cl* Terzan 8 MBF 2613 * 19 41 29.9351096280 -33 57 46.814127840     18.330   17.199 ~ 2 0
27 Cl* Terzan 8 MBF 126 * 19 41 29.9713173528 -34 03 16.741607832     16.833   15.680 ~ 2 0
28 Cl* Terzan 8 MBF 1542 * 19 41 30.6011461776 -34 00 00.011499120     18.407   17.420 ~ 2 0
29 Cl* Terzan 8 MBF 2336 * 19 41 30.7565500344 -33 58 31.107886716     18.463   17.438 ~ 2 0
30 Cl* Terzan 8 MBF 75 * 19 41 30.8062021776 -34 03 31.236586884     18.501   17.452 ~ 2 0
31 Cl* Terzan 8 MBF 1727 * 19 41 31.7852422488 -33 59 41.057881296     17.843   16.767 ~ 2 0
32 Cl* Terzan 8 MBF 55 * 19 41 31.9333933776 -34 03 39.910915512     18.540   17.531 ~ 2 0
33 Cl* Terzan 8 MBF 187 * 19 41 32.7771574104 -34 02 59.288923788     18.078   16.994 ~ 2 0
34 Cl* Terzan 8 MBF 450 * 19 41 33.2886169080 -34 02 07.883248452     17.258   16.089 ~ 2 0
35 Cl* Terzan 8 MBF 2846 * 19 41 33.6240105912 -33 56 51.987262308     18.722   17.675 ~ 2 0
36 Cl* Terzan 8 MBF 1169 * 19 41 33.7152542016 -34 00 36.053793864     16.167   14.933 ~ 2 0
37 Cl* Terzan 8 MBF 2586 HB* 19 41 33.8363380896 -33 57 49.827717144     18.382   18.234 ~ 2 0
38 Cl* Terzan 8 MBF 1077 * 19 41 34.6608641760 -34 00 45.384856884     16.878   15.716 ~ 2 0
39 Cl* Terzan 8 MBF 2811 * 19 41 34.8737963952 -33 57 00.551667312     18.615   17.603 ~ 2 0
40 Cl* Terzan 8 MBF 3022 * 19 41 35.0651151456 -33 55 58.409509800     18.112   17.071 ~ 2 0
41 Cl* Terzan 8 MBF 2023 Pe* 19 41 35.5675615680 -33 59 11.457590784     16.982   15.834 ~ 3 0
42 Cl* Terzan 8 MBF 2531 Pe* 19 41 35.9504986440 -33 58 02.201634552     16.913   15.759 ~ 3 0
43 Cl* Terzan 8 MBF 2660 * 19 41 36.5104466808 -33 57 37.105198488     13.170   11.963 ~ 1 0
44 Cl* Terzan 8 MBF 2807 * 19 41 36.900 -33 57 01.56     18.624   17.612 ~ 2 0
45 Cl* Terzan 8 MBF 2086 * 19 41 36.9656259576 -33 59 03.262678980     16.171   14.896 ~ 2 0
46 Cl* Terzan 8 OG 305 * 19 41 37.0566363024 -34 00 33.950581200   16.707 15.411   14.069 ~ 4 0
47 Cl* Terzan 8 MBF 652 * 19 41 37.0939831656 -34 01 33.859058808     16.801   15.753 ~ 2 0
48 Cl* Terzan 8 MBF 1444 * 19 41 37.1356556016 -34 00 08.369973468     17.950   16.889 ~ 2 0
49 Cl* Terzan 8 MBF 927 * 19 41 37.6874249424 -34 01 02.112620772     18.691   17.696 ~ 2 0
50 Cl* Terzan 8 MBF 1728 * 19 41 38.5418034061 -33 59 39.404822238     16.327   15.095 ~ 2 0
51 Cl* Terzan 8 MBF 1301 * 19 41 38.7599678880 -34 00 21.787407216     18.145   17.103 ~ 1 0
52 Cl* Terzan 8 MBF 600 * 19 41 39.1863404880 -34 01 42.234921912     17.075   15.956 ~ 2 0
53 Cl* Terzan 8 MBF 835 * 19 41 39.5743047768 -34 01 12.709914672     18.985   18.046 ~ 2 0
54 Cl* Terzan 8 MBF 2057 * 19 41 39.8681802408 -33 59 05.568152280     17.429   16.328 ~ 2 0
55 Cl* Terzan 8 MBF 2873 * 19 41 39.8857619832 -33 56 43.623269484     18.580   17.657 ~ 2 0
56 Cl* Terzan 8 MBF 3104 * 19 41 40.4094539760 -33 55 24.757206708     16.450   15.155 ~ 2 0
57 Cl* Terzan 8 MBF 125 * 19 41 40.5573660840 -34 03 15.017928048     17.963   17.011 ~ 1 0
58 Cl* Terzan 8 MBF 780 HB* 19 41 41.100 -34 01 17.70     18.406   18.270 ~ 1 0
59 Cl* Terzan 8 MBF 1755 * 19 41 41.3362683552 -33 59 36.131563068     18.923   17.924 ~ 2 0
60 Cl* Terzan 8 MBF 1950 * 19 41 41.3870013240 -33 59 17.575978380     17.649   16.559 ~ 2 0
61 Cl* Terzan 8 MBF 1387 * 19 41 41.4900324504 -34 00 13.460312448     18.977   18.013 ~ 2 0
62 Cl* Terzan 8 MBF 2253 * 19 41 41.7569674392 -33 58 40.308862512     15.834   14.567 ~ 2 0
63 Cl* Terzan 8 MBF 1147 * 19 41 42.3034107768 -34 00 36.338215608     17.279   16.171 ~ 2 0
64 Cl* Terzan 8 MBF 2124 * 19 41 42.8940473688 -33 58 56.209407996     16.865   15.707 ~ 4 0
65 Cl* Terzan 8 MBF 496 * 19 41 42.9285375576 -34 01 56.667830736     16.581   15.377 ~ 3 0
66 Cl* Terzan 8 MBF 1165 HB* 19 41 43.7369099208 -34 00 34.552430208     18.214   18.005 ~ 1 0
67 Cl* Terzan 8 MBF 2503 * 19 41 43.8475838376 -33 58 04.967869116     17.320   16.198 ~ 3 0
68 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
69 Cl* Terzan 8 MBF 1840 * 19 41 44.5538262984 -33 59 27.346083288     18.006   16.962 ~ 2 0
70 Cl* Terzan 8 OG 325 * 19 41 45.0551190840 -34 00 29.959976736   16.624 15.256   13.866 ~ 4 0
71 Cl* Terzan 8 MBF 526 * 19 41 45.0952420464 -34 01 50.545826832     16.227   15.017 ~ 3 0
72 Cl* Terzan 8 MBF 2583 * 19 41 45.1750596984 -33 57 48.273496236     17.841   16.769 ~ 1 0
73 Cl* Terzan 8 MBF 2180 * 19 41 45.6839508504 -33 58 48.833521176     16.945   15.792 ~ 2 0
74 Cl* Terzan 8 MBF 312 * 19 41 45.7993559784 -34 02 32.107676388     18.455   17.428 ~ 2 0
75 Cl* Terzan 8 MBF 946 * 19 41 46.3546004400 -34 00 58.347732204     17.724   16.663 ~ 2 0
76 Cl* Terzan 8 MBF 2932 * 19 41 46.3734350568 -33 56 24.848224188     17.036   16.024 ~ 2 0
77 Cl* Terzan 8 MBF 1263 HB* 19 41 46.3845596496 -34 00 23.948046072     18.459   18.320 ~ 1 0
78 Cl* Terzan 8 MBF 1664 HB* 19 41 46.8135987192 -33 59 44.867417244     18.354   18.194 ~ 1 0
79 Cl* Terzan 8 MBF 2263 * 19 41 47.1936803232 -33 58 38.218100844     17.701   16.634 ~ 2 0
80 Cl* Terzan 8 MBF 2389 * 19 41 47.3745961536 -33 58 20.129631276     18.404   17.390 ~ 2 0
81 Cl* Terzan 8 MBF 514 * 19 41 47.7373923696 -34 01 51.453413580     16.469   15.269 ~ 2 0
82 Cl* Terzan 8 MBF 883 HB* 19 41 48.0721314144 -34 01 05.438506332     18.218   18.030 ~ 1 0
83 Cl* Terzan 8 MBF 1043 * 19 41 48.3147765504 -34 00 45.888720660     18.079   17.044 ~ 2 0
84 Cl* Terzan 8 MBF 355 * 19 41 48.7184059152 -34 02 23.676178128     17.851   16.877 ~ 2 0
85 Cl* Terzan 8 MBF 137 Pe* 19 41 48.7759467552 -34 03 12.130461684     15.957   14.625 ~ 4 0
86 Cl* Terzan 8 MBF 2913 Pe* 19 41 49.0541626656 -33 56 29.724772596     16.458   15.238 ~ 5 0
87 Cl* Terzan 8 MBF 2541 * 19 41 49.0809140976 -33 57 57.591931068     18.476   17.493 ~ 2 0
88 Cl* Terzan 8 MBF 81 HB* 19 41 49.6858154544 -34 03 26.625105828     18.378   18.197 ~ 1 0
89 Cl* Terzan 8 MBF 1658 * 19 41 49.7909484744 -33 59 44.655225720     15.269   13.838 ~ 3 0
90 Cl* Terzan 8 MBF 1833 * 19 41 49.8009200256 -33 59 26.805037596     18.192   17.164 ~ 2 0
91 Cl* Terzan 8 MBF 1254 * 19 41 50.3521159344 -34 00 24.221522520     18.786   17.834 ~ 2 0
92 Cl* Terzan 8 MBF 2163 HB* 19 41 50.8844351448 -33 58 49.738136916     18.104   17.812 ~ 2 0
93 Cl* Terzan 8 MBF 11 * 19 41 50.9800668600 -34 03 51.127258104     17.571   16.492 ~ 2 0
94 Cl* Terzan 8 MBF 2912 HB* 19 41 51.2760812424 -33 56 29.397174900     18.072   17.773 ~ 1 0
95 Cl* Terzan 8 MBF 3099 * 19 41 51.2912333808 -33 55 26.717244096     16.280   15.209 ~ 2 0
96 Cl* Terzan 8 MBF 1059 HB* 19 41 52.2581879088 -34 00 43.591585068     18.224   18.045 ~ 1 0
97 Cl* Terzan 8 MBF 614 * 19 41 52.5431119704 -34 01 37.669243764     17.943   16.849 ~ 2 0
98 Cl* Terzan 8 MBF 2148 HB* 19 41 53.5523995896 -33 58 51.431293776     18.251   18.079 ~ 1 0
99 Cl* Terzan 8 MBF 1217 * 19 41 53.8588228224 -34 00 27.387007884     17.901   16.898 ~ 2 0
100 Cl* Terzan 8 MBF 957 * 19 41 54.6617791128 -34 00 54.876967344     18.279   17.261 ~ 1 0
101 Cl* Terzan 8 MBF 3115 * 19 41 54.6770224152 -33 55 19.230087648     16.404   15.347 ~ 2 0
102 Cl* Terzan 8 MBF 2841 * 19 41 54.7186313736 -33 56 49.042326984     18.595   17.612 ~ 1 0
103 Cl* Terzan 8 MBF 1067 * 19 41 54.8888820528 -34 00 42.331953096     18.383   17.457 ~ 2 0
104 Cl* Terzan 8 MBF 2278 HB* 19 41 55.0563954768 -33 58 34.088741724     18.550   18.467 ~ 1 0
105 Cl* Terzan 8 MBF 1350 RR* 19 41 55.1392623264 -34 00 14.232025368     17.962   17.462 ~ 8 0
106 Cl* Terzan 8 MBF 2760 * 19 41 55.2142877208 -33 57 08.563733784     17.591   16.518 ~ 2 0
107 Cl* Terzan 8 MBF 530 * 19 41 55.6533325632 -34 01 48.233894484     15.288   13.881 ~ 4 0
108 Cl* Terzan 8 MBF 2491 HB* 19 41 56.8672165248 -33 58 04.352325564     18.003   17.730 ~ 2 0
109 Cl* Terzan 8 MBF 3068 * 19 41 57.0781682376 -33 55 39.224791344     15.086   13.448 ~ 2 0
110 Cl* Terzan 8 MBF 2651 HB* 19 41 57.6214187784 -33 57 35.268039108     18.063   17.732 ~ 1 0
111 Cl* Terzan 8 MBF 2908 * 19 41 57.7181440512 -33 56 30.684177384     18.812   17.737 ~ 2 0
112 Cl* Terzan 8 MBF 2217 HB* 19 41 58.5676369152 -33 58 41.365826472     18.429   18.268 ~ 1 0
113 Cl* Terzan 8 MBF 2899 * 19 41 59.0162605800 -33 56 32.695203696     16.860   15.756 ~ 2 0
114 Cl* Terzan 8 MBF 82 * 19 41 59.5042549080 -34 03 24.352833312     18.112   17.077 ~ 2 0
115 Cl* Terzan 8 MBF 2357 * 19 42 00.0380476872 -33 58 21.628961796     15.072   13.570 ~ 4 0
116 Cl* Terzan 8 MBF 761 * 19 42 00.2372560752 -34 01 16.354642908     18.071   17.037 ~ 2 0
117 Cl* Terzan 8 MBF 1373 * 19 42 00.9925696488 -34 00 10.763727192     18.323   17.345 ~ 2 0
118 Cl* Terzan 8 MBF 456 * 19 42 01.1886086784 -34 02 01.663589904     17.597   16.644 ~ 2 0
119 Cl* Terzan 8 MBF 1110 * 19 42 01.9463413824 -34 00 36.830794536     18.114   17.064 ~ 2 0
120 Cl* Terzan 8 MBF 2126 * 19 42 02.5598860632 -33 58 52.251230928     18.053   16.994 ~ 2 0
121 Cl* Terzan 8 MBF 2039 * 19 42 03.4958261016 -33 59 04.107010380     17.652   16.469 ~ 2 0
122 Cl* Terzan 8 MBF 36 * 19 42 05.8608731760 -34 03 40.475243880     17.831   16.880 ~ 1 0
123 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
124 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
125 NAME Local Group GrG ~ ~           ~ 9325 0

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