2010A&A...517A..59K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST08:14:28

2010A&A...517A..59K - Astronomy and Astrophysics, volume 517, A59-59 (2010/7-1)

Chemical abundances for the outer halo cluster Pal 4 from co-added high-resolution spectroscopy.

KOCH A. and COTE P.

Abstract (from CDS):

Chemical element abundances for distant Galactic globular clusters (GCs) hold important clues to the origin of the Milky Way halo and its substructures. We study the chemical composition of red giant stars in Pal 4 - one of the most remote GCs in the Milky Way - and compare our abundance measurements to those for both low surface brightness dwarf galaxies, and GCs in the inner and the outer halo. By co-adding high-resolution, low-S/N Keck/HIRES spectra of 19 stars along the red giant branch, we estimate chemical abundance ratios of 20 α-, iron peak-, and neutron-capture elements. Our method gives total uncertainties on most element-to-iron ratios of typically 0.2dex. We measure [Fe/H]=-1.41±0.04 (statistical)±0.17 (systematic) and an α-enhancement of [α/Fe]=+0.38±0.11dex, which is consistent with the canonical value of ~+0.4dex found for Galactic halo field stars and most halo GCs at this metallicity. Although Pal 4 has higher enhancements in the heavier elements with respect to the halo, the majority of the element ratios are, within the measurement errors, consistent with those for local halo field stars. We find, however, evidence for a lower [Mg/Ca] ratio than in other halo clusters. Based on the available evidence, we conclude that the material from which Pal 4 and the Galactic halo formed experienced similar enrichment processes, despite the apparently younger age of this cluster. Within the limitations of our methodology we find no significant indication of an iron spread, as is typical of genuine GCs of the Milky Way. However, abundance ratios for individual stars in Pal 4 and other distant satellites are urgently needed to understand the relationship, if any, between remote GCs and other halo substructures (i.e., luminous and ultra-faint dwarf spheroidal galaxies).

Abstract Copyright:

Journal keyword(s): stars: abundances - Galaxy: abundances - Galaxy: evolution - Galaxy: halo - globular clusters: individual: Pal 4

Nomenclature: Table 1: [KC2010] Pal4-NN N=24 among (Nos 1-31).

Simbad objects: 49

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Number of rows : 49

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 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
2 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 180 0
3 NAME CL ERID 1 GlC 04 24 44.5 -21 11 13           ~ 159 1
4 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 991 0
5 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 815 0
6 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 311 0
7 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 290 1
8 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 706 0
9 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 736 0
10 [KC2010] Pal4-30 * 11 29 08.80 +28 58 13.1   20.79 19.89   18.87 ~ 2 0
11 [KC2010] Pal4-8 * 11 29 12.66 +28 58 29.6   19.77 18.6   17.37 ~ 2 0
12 [KC2010] Pal4-3 * 11 29 13.24 +28 58 13.6   19.48 17.82   16.29 ~ 2 0
13 [KC2010] Pal4-9 * 11 29 13.32 +28 59 07.6   20.08 19.00   17.82 ~ 2 0
14 [KC2010] Pal4-11 * 11 29 13.82 +28 58 40.9   20.24 19.35   18.31 ~ 2 0
15 [KC2010] Pal4-21 * 11 29 14.03 +28 58 45.7   20.57 19.64   18.60 ~ 2 0
16 [KC2010] Pal4-7 * 11 29 14.83 +28 58 32.2   19.74 18.55   17.31 ~ 2 0
17 [KC2010] Pal4-18 * 11 29 15.37 +28 57 55.8   20.46 19.48   18.42 ~ 2 0
18 [KC2010] Pal4-6 * 11 29 15.50 +28 57 47.0   19.52 18.22   16.89 ~ 2 0
19 [KC2010] Pal4-19 * 11 29 15.65 +28 57 14.7   20.48 19.53   18.45 ~ 2 0
20 [KC2010] Pal4-10 * 11 29 15.71 +28 57 23.4   20.14 19.09   17.96 ~ 2 0
21 [KC2010] Pal4-17 * 11 29 15.95 +28 58 47.8   20.30 19.45   18.46 ~ 2 0
22 [KC2010] Pal4-25 * 11 29 15.95 +28 58 47.8   20.68 19.77   18.75 ~ 2 0
23 [KC2010] Pal4-15 * 11 29 16.45 +28 58 18.4   20.26 19.38   18.38 ~ 2 0
24 [KC2010] Pal4-5 * 11 29 16.67 +28 58 42.1   19.39 17.95   16.48 ~ 2 0
25 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 316 1
26 [KC2010] Pal4-31 * 11 29 16.82 +28 58 21.5   20.82 19.89   18.86 ~ 2 0
27 [KC2010] Pal4-23 * 11 29 16.93 +28 58 06.8   20.63 19.70   18.65 ~ 2 0
28 [KC2010] Pal4-2 * 11 29 17.02 +28 57 51.5   19.39 17.93   16.48 ~ 2 0
29 [KC2010] Pal4-1 * 11 29 17.13 +28 57 59.9   19.27 17.81   16.29 ~ 2 0
30 [KC2010] Pal4-24 * 11 29 17.24 +28 57 46.7   20.66 19.74   18.71 ~ 2 0
31 [KC2010] Pal4-26 * 11 29 17.32 +28 58 12.8   20.74 19.83   18.81 ~ 2 0
32 [KC2010] Pal4-12 * 11 29 17.63 +28 58 25.1   20.25 19.35   18.32 ~ 2 0
33 [KC2010] Pal4-16 * 11 29 17.77 +28 58 19.5   20.31 19.43   18.41 ~ 2 0
34 [KC2010] Pal4-28 * 11 29 18.50 +28 58 41.0   20.78 19.87   18.85 ~ 2 0
35 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 318 1
36 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 389 1
37 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2265 0
38 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 339 0
39 NGC 5496 GiG 14 11 37.855 -01 09 31.39   13.40   13.0 12.8 ~ 112 0
40 NGC 5694 GlC 14 39 36.52 -26 32 18.0   11.58 10.89     ~ 268 0
41 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1178 0
42 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1771 0
43 NAME Her Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 275 1
44 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2006 0
45 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1165 1
46 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2
47 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0
48 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 485 0
49 NGC 7492 GlC 23 08 26.68 -15 36 41.3     10.48     ~ 255 0

    Equat.    Gal    SGal    Ecl

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2020.07.09-08:14:28

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