2018A&A...613A..56L


Query : 2018A&A...613A..56L

2018A&A...613A..56L - Astronomy and Astrophysics, volume 613A, 56-56 (2018/5-1)

Detailed abundance analysis of globular clusters in the Local Group. NGC 147, NGC 6822, and Messier 33.

LARSEN S.S., BRODIE J.P., WASSERMAN A. and STRADER J.

Abstract (from CDS):

Context. Globular clusters (GCs) are emerging as powerful tracers of the chemical composition of extragalactic stellar populations. Aims. We present new abundance measurements for 11 GCs in the Local Group galaxies NGC 147, NGC 6822, and Messier 33. These are combined with previously published observations of four GCs in the Fornax and Wolf-Lundmark-Melotte (WLM) galaxies. Methods. The abundances were determined from analyses of integrated-light spectra obtained with the HIRES spectrograph on the Keck I telescope and with UVES on the Very Large Telescope (VLT). We used our analysis technique that was developed for this purpose and tested on Milky Way GCs. Results. We find that the clusters with [Fe/H]< -1.5 are all α-enhanced at about the same level as Milky Way GCs. Their Na abundances are also generally enhanced relative to Milky Way halo stars, suggesting that these extragalactic GCs resemble their Milky Way counterparts in containing large numbers of Na-rich stars. For [Fe/H]>-1.5, the GCs in M33 are also α-enhanced, while the GCs that belong to dwarfs (NGC 6822 SC7 and Fornax 4) have closer to solar-scaled α-element abundances. The abundance patterns in SC7 are remarkably similar to those in the Galactic GC Ruprecht 106, including significantly subsolar [Na/Fe] and [Ni/Fe] ratios. In NGC 147, the GCs with [Fe/H]< -2.0 account for about 6% of the total luminosity of stars in the same metallicity range, a lower fraction than those previously found in the Fornax and WLM galaxies, but substantially higher than in the Milky Way halo. Conclusions. At low metallicities, the abundance patterns suggest that GCs in the Milky Way, dwarf galaxies, and M33 experienced similar enrichment histories and/or processes. At higher metallicities, the lower levels of α-enhancement in the GCs found in dwarf galaxies resemble the abundance patterns observed in field stars in nearby dwarfs. Constraining the presence of multiple populations in these GCs is complicated by lack of information about detailed abundances in field stars of the corresponding metallicities. We suggest that correlations such as [Na/Fe] versus [Ni/Fe] may prove useful for this purpose if an accuracy of ∼0.1dex or better can be reached for integrated-light measurements.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: star clusters: general - galaxies: abundances - galaxies: individual: NGC 147 - galaxies: individual: NGC 6822 - galaxies: individual: M 33

VizieR on-line data: <Available at CDS (J/A+A/613/A56): table1.dat tablea1.dat-tablea15.dat>

CDS comments: Clusters H38, U49 and M9 are [CS82] H38, [CS82] U49, [CS82] M9, [CS82] R12 = CBF 116.

Simbad objects: 37

goto Full paper

goto View the references in ADS

Number of rows : 37
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 631 2
2 HD 1918 * 00 23 43.2410842176 +45 05 20.901993612   8.59 7.62     G9III 35 0
3 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3747 0
4 [SD2009] GC7 GlC 00 32 22.20 +48 31 27.5     17.4 16.6   ~ 6 0
5 [VFH2013] PA-N147-1 GlC 00 32 35.30 +48 19 48.0           ~ 5 0
6 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 663 1
7 [H76b] 2 GlC 00 33 13.60 +48 28 48.7     18.38     ~ 6 0
8 [H76b] 3 GlC 00 33 15.20 +48 27 23.1   17.62 16.98     ~ 8 0
9 [VFH2013] PA-N147-2 GlC 00 33 43.30 +48 38 45.0           ~ 5 0
10 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11931 1
11 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1019 0
12 [SSA2010] 1458 GlC 01 33 45.10 +30 47 46.7 17.210 17.081 16.298 15.823 15.311 ~ 38 0
13 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5538 1
14 [SSA2010] 1566 GlC 01 33 52.20 +30 29 03.8 18.297 18.126 17.290 16.773 16.277 ~ 32 0
15 [SSA2010] 1765 GlC 01 34 08.04 +30 38 38.2 17.512 17.286 16.376 15.839 15.282 ~ 27 0
16 [SSA2010] 2075 GlC 01 34 30.20 +30 38 13.0 17.848 17.880 17.127 16.618 16.108 ~ 33 0
17 NAME Fornax H1 Cl* 02 37 02.1 -34 11 00     16.59     ~ 101 0
18 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 118 0
19 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1630 1
20 NAME Fornax H4 GlC 02 40 07.697 -34 32 10.59   15.18 13.91 14.08   ~ 105 0
21 NAME Fornax H5 GlC 02 42 21.111 -34 06 05.80   14.5       ~ 96 0
22 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 884 0
23 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 348 0
24 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 584 0
25 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2384 0
26 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2234 0
27 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 673 0
28 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 749 0
29 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2006 0
30 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 397 0
31 [H25] VII Cl* 19 44 55.77 -14 48 56.2   16.68 15.85     ~ 22 0
32 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1504 0
33 [HFV2013] SC6 Cl* 19 45 37.02 -14 41 10.8           ~ 7 0
34 [HFV2013] SC7 Cl* 19 46 00.85 -14 32 35.4           ~ 6 0
35 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3037 0
36 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 986 0
37 NAME Local Group GrG ~ ~           ~ 7764 0

To bookmark this query, right click on this link: simbad:objects in 2018A&A...613A..56L and select 'bookmark this link' or equivalent in the popup menu


2022.09.24-18:29:09

© Université de Strasbourg/CNRS

    • Contact