2016A&A...585A..86H

Query : 2016A&A...585A..86H

2016A&A...585A..86H - Astronomy and Astrophysics, volume 585A86-86 (2016/1-1)

Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph.

HENDRICKS B., BOECHE C., JOHNSON C.I., FRANK M.J., KOCH A., MATEO M. and BAILEY III J.I.

Abstract (from CDS):

The globular cluster H4, located in the center of the Fornax dwarf spheroidal galaxy, is crucial for understanding the formation and chemical evolution of star clusters in low-mass galactic environments. H4 is peculiar because the cluster is significantly more metal-rich than the galaxy's other clusters, is located near the galaxy center, and may also be the youngest cluster in the galaxy. In this study, we present detailed chemical abundances derived from high-resolution (R∼28000) spectroscopy of an isolated H4 member star for comparison with a sample of 22 nearby Fornax field stars. We find the H4 member to be depleted in the alpha-elements Si, Ca, and Ti with [Si/Fe]=-0.35±0.34, [Ca/Fe]=+0.05±0.08, and [Ti/Fe]=-0.27±0.23, resulting in an average [α/Fe]=-0.19±0.14. If this result is representative of the average cluster properties, H4 is the only known system with a low [α/Fe] ratio and a moderately low metallicity embedded in an intact birth environment. For the field stars we find a clear sequence, seen as an early depletion in [α/Fe] at low metallicities, in good agreement with previous measurements. H4 falls on top of the observed field star [α/Fe] sequence and clearly disagrees with the properties of Milky Way halo stars. We therefore conclude that within a galaxy, the chemical enrichment of globular clusters may be closely linked to the enrichment pattern of the field star population. The low [α/Fe] ratios of H4 and similar metallicity field stars in Fornax give evidence that slow chemical enrichment environments, such as dwarf galaxies, may be the original hosts of alpha-depleted clusters in the halos of the Milky Way and M31.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Fornax - globular clusters: individual: H4 - galaxies: abundances - galaxies: evolution - galaxies: dwarf - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/585/A86): tablea1.dat tablea2.dat tablea3.dat>

Nomenclature: Tables A.1-A.3: [HBJ2016] rNNNN N=15 among (Nos 6-24), [HBJ2016] bNNNN N=15 among (Nos 1-23).

Simbad objects: 50

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Number of rows : 50
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 Mackey-GC1 GlC 00 26 47.7578536272 +39 44 46.082343084     16.05   15.07 ~ 21 1
2 NAME PA-17 GlC 00 26 52.2026124624 +38 44 58.106513112           ~ 14 0
3 [HTF2008] H2 GlC 00 28 03.2413107384 +40 02 55.554275688     17.58   16.64 ~ 12 0
4 [HTF2008] H3 GlC 00 29 30.15 +41 50 32.1     18.13   16.97 ~ 10 0
5 2MASX J00302731+4136193 GlC 00 30 27.3168237696 +41 36 18.963573372     16.31   15.36 ~ 22 0
6 NAME Mayall III GlC 00 33 33.7890475296 +39 31 18.763470120 16.750 16.482 15.807 15.325   ~ 55 0
7 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
8 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
9 [HBJ2016] r0020 RG* 02 39 04.8178289568 -34 41 31.320023280     18.422   17.192 ~ 2 0
10 2MASS J02391142-3429222 RG* 02 39 11.4178313400 -34 29 22.161388848     18.012   16.692 ~ 5 0
11 2MASS J02391228-3444385 RG* 02 39 12.2843208336 -34 44 38.680881504     17.912   16.77 ~ 7 0
12 [HBJ2016] r0019 * 02 39 31.5080234736 -34 46 45.494174712     18.082   17.062 ~ 1 0
13 [HBJ2016] b0005 * 02 39 36.2853762096 -34 51 26.042176800     18.062   16.352 ~ 1 0
14 [HBJ2016] b0003 RG* 02 39 39.8920917336 -34 43 07.003394472     18.362   17.252 ~ 2 0
15 [HBJ2016] r0014 RG* 02 39 41.1936175848 -34 34 50.172043548     18.242   17.03 ~ 4 0
16 [HBJ2016] b0011 RG* 02 39 52.6028475576 -34 45 44.341821972     17.982   16.692 ~ 2 0
17 [HBJ2016] b0010 RG* 02 39 53.7636903480 -34 38 55.568313132     18.322   17.162 ~ 2 0
18 [HBJ2016] b0009 * 02 39 55.3796413728 -34 45 56.006987364     18.282   16.802 ~ 1 0
19 2MASS J02395710-3449070 RG* 02 39 57.1111086672 -34 49 06.928820436     18.412   17.42 ~ 4 0
20 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
21 GB07 Fnx34 RG* 02 40 02.7253509744 -34 38 30.019620948     18.162   16.902 ~ 6 0
22 [HBJ2016] r0022 RG* 02 40 04.0143268344 -34 32 13.507754028     19.312   18.22 ~ 4 0
23 [HBJ2016] r0024 * 02 40 04.4610991536 -34 31 38.559284328     19.532   18.371 ~ 1 0
24 2MASS J02400508-3435417 RG* 02 40 05.1084789432 -34 35 41.703382428     18.332   17.28 ~ 5 0
25 2MASS J02400550-3432429 RG* 02 40 05.5084039440 -34 32 42.767412360   20.155 18.326 17.595 16.74 ~ 12 0
26 2MASS J02400596-3432009 RG* 02 40 05.9669666592 -34 32 00.828558996   19.902 18.367 17.688 17.03 ~ 8 0
27 [WMO2009] For-0128 * 02 40 06.062 -34 31 38.36     18.883   17.38 ~ 2 0
28 [HBJ2016] r0016 * 02 40 06.6366987024 -34 32 25.747537272     20.068   19.027 ~ 1 0
29 [HBJ2016] r0018 RG* 02 40 07.0705409686 -34 31 25.736685655     19.196   18.054 ~ 2 0
30 [HBJ2016] r0017 * 02 40 07.220 -34 31 44.94     19.488   18.314 ~ 1 0
31 [HBJ2016] r0010 RG* 02 40 07.6945896605 -34 32 00.854038003     18.805   17.61 ~ 3 0
32 NAME Fornax H4 GlC 02 40 07.697 -34 32 10.59   15.18 13.91 14.08   ~ 112 0
33 [HBJ2016] r0011 RG* 02 40 08.2997433921 -34 32 37.200025612     18.818   17.491 ~ 2 0
34 [HBJ2016] r0009 * 02 40 08.8438216440 -34 32 47.764026060     19.249   18.1 ~ 3 0
35 [KGS2010] For 79128 RG* 02 40 09.16 -34 32 59.8   20.745 19.540 19.059 18.424 ~ 3 0
36 [HBJ2016] r0006 RG* 02 40 10.1532024600 -34 31 48.770177736     18.892   17.632 ~ 3 0
37 [WMO2009] For-1980 * 02 40 10.9167579934 -34 32 04.262941503     19.913   18.99 ~ 3 0
38 [HBJ2016] b0019 RG* 02 40 11.1992374992 -34 31 46.718451732   20.774 19.627 19.097 18.484 ~ 3 0
39 2MASS J02402148-3425574 RG* 02 40 21.4971687528 -34 25 57.523829880     18.402   16.78 ~ 4 0
40 [HBJ2016] b0023 * 02 40 30.2151034848 -34 38 53.790210924     18.142   16.932 ~ 2 0
41 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
42 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
43 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
44 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
45 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
46 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
47 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
48 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
49 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
50 NAME Local Group GrG ~ ~           ~ 9325 0

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