2017MNRAS.472.2856S

Query : 2017MNRAS.472.2856S

2017MNRAS.472.2856S - Mon. Not. R. Astron. Soc., 472, 2856-2868 (2017/December-2)

ESO 452-SC11: the lowest mass globular cluster with a potential chemical inhomogeneity.

SIMPSON J.D., DE SILVA G., MARTELL S.L., NAVIN C.A. and ZUCKER D.B.

Abstract (from CDS):

We present the largest spectroscopic investigation of one of the faintest and least studied stellar clusters of the Milky Way, ESO 452-SC11. Using the Anglo-Australian Telescope AAOmega and Keck High Resolution Echelle Spectrometer spectrographs we have identified 11 members of the cluster and found indications of star-to-star light element abundance variation, primarily using the blue cyanogen absorption features. From a stellar density profile, we estimate a total cluster mass of (6.8 ± 3.4) x 103 M☉. This would make ESO 452-SC11 the lowest mass cluster with evidence for multiple populations. These data were also used to measure the radial velocity of the cluster (16.7 ± 0.3 km s–1) and confirm that ESO 452-SC11 is relatively metal rich for a globular cluster ([Fe/H] = -0.81 ± 0.13). All known massive clusters studied in detail show multiple populations of stars each with a different chemical composition, but many low-mass globular clusters appear to be chemically homogeneous. ESO 452-SC11 sets a lower mass limit for the multiple stellar population phenomenon.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): globular clusters: individual: ESO 452-SC11 - globular clusters: individual: ESO 452-SC11

Simbad objects: 42

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Number of rows : 42
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 Cl Lindsay 1 Cl* 00 03 53.50 -73 28 15.0   11.7       ~ 125 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
4 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
5 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
6 NAME E 3 GlC 09 20 57.07 -77 16 54.8           ~ 185 0
7 NAME UKS 2 OpC 09 25 15.2 -54 42 55           ~ 43 0
8 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
9 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 379 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 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
13 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
14 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
15 2MASS J16392205-2823504 RG* 16 39 22.0441705644 -28 23 50.455915129       16.43 15.07 ~ 2 0
16 2MASS J16392232-2823536 HB* 16 39 22.322 -28 23 53.67   14.40 15.79 14.4 14.93 ~ 1 0
17 UCAC3 124-201464 * 16 39 22.4839112976 -28 23 22.023125160   18.13 16.26 15.69 15.01 ~ 1 0
18 UCAC2 20187467 * 16 39 23.5384266096 -28 24 34.894127088   17.21 15.83 15.35 13.81 ~ 2 0
19 2MASS J16392409-2823075 RG* 16 39 24.0932951856 -28 23 07.674263952   15.82 14.29 14.07 12.41 ~ 3 0
20 UCAC3 124-201483 HB* 16 39 24.5607981552 -28 24 11.361486528   17.36 16.34 16.29   ~ 1 0
21 UCAC3 124-201492 * 16 39 25.0170553248 -28 23 57.700061772   17.05 14.81 16.49 14.97 ~ 1 0
22 2MASS J16392526-2823384 RG* 16 39 25.2656609088 -28 23 38.581311660   14.99 13.69 13.74 11.97 ~ 3 0
23 2MASS J16392545-2824055 RG* 16 39 25.4460313996 -28 24 05.665834684   15.65   14.27 14.79 ~ 2 0
24 ESO 452-11 GlC 16 39 25.50 -28 23 52.0           ~ 89 0
25 UCAC3 124-201500 PM* 16 39 26.0836358352 -28 23 55.395672972   17.58 16.96 15.70 15.39 ~ 1 0
26 UCAC2 20187484 * 16 39 26.6128257288 -28 23 36.576488904   15.72 15.78 15.60 14.17 ~ 1 0
27 UCAC4 309-090346 HB* 16 39 26.9642620944 -28 22 45.454646712   17.73 16.47 15.99 15.13 ~ 1 0
28 2MASS J16392765-2823576 AB* 16 39 27.6548830200 -28 23 57.759115308   17.70 16.28 16.75 15.01 ~ 1 0
29 2MASS J16392794-2824071 RG* 16 39 27.9434644824 -28 24 07.230943332   16.11 14.33 14.48 12.77 ~ 3 0
30 2MASS J16392814-2824033 RG* 16 39 28.1396439744 -28 24 03.455149500       15.31 13.36 ~ 2 0
31 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 208 0
32 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
33 NGC 6535 GlC 18 03 50.51 -00 17 51.5     9.85     ~ 320 0
34 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
35 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
36 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
37 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
38 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 384 0
39 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
40 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
41 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
42 HD 223311 V* 23 48 32.4794141016 -06 22 49.524743316   7.526 6.069     K2/3III 59 0

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