2009A&A...493..913F


Query : 2009A&A...493..913F

2009A&A...493..913F - Astronomy and Astrophysics, volume 493, 913-930 (2009/1-3)

Stellar abundances and ages for metal-rich. Milky Way globular clusters. Stellar parameters and elemental abundances for 9 HB stars in NGC6352.

FELTZING S., PRIMAS F. and JOHNSON R.A.

Abstract (from CDS):

Metal-rich globular clusters provide important tracers of the formation of our Galaxy. Moreover, and not less important, they are very important calibrators for the derivation of properties of extra-galactic metal-rich stellar populations. Nonetheless, only a few of the metal-rich globular clusters in the Milky Way have been studied using high-resolution stellar spectra to derive elemental abundances. Additionally, Rosenberg et al. identified a small group of metal-rich globular clusters that appeared to be about 2 billion years younger than the bulk of the Milky Way globular clusters. However, it is unclear if like is compared with like in this dataset as we do not know the enhancement of α-elements in the clusters and the amount of α-elements is well known to influence the derivation of ages for globular clusters. We derive elemental abundances for the metal-rich globular cluster NGC6352 and we present our methods to be used in up-coming studies of other metal-rich globular clusters. We present a study of elemental abundances for α- and iron-peak elements for nine HB stars in the metal-rich globular cluster NGC6352. The elemental abundances are based on high-resolution, high signal-to-noise spectra obtained with the UVES spectrograph on VLT. The elemental abundances have been derived using standard LTE calculations and stellar parameters have been derived from the spectra themselves by requiring ionizational as well as excitational equilibrium. We find that NGC6352 has [Fe/H]=-0.55, is enhanced in the α-elements to about +0.2dex for Ca, Si, and Ti relative to Fe. For the iron-peak elements we find solar values. Based on the spectroscopically derived stellar parameters we find that an E(B-V)=0.24 and (m-M)≃14.05 better fits the data than the nominal values. An investigation of loggf-values for suitable Fei lines lead us to the conclusion that the commonly used correction to the May et al. (1974A&AS...18..405M) data should not be employed.

Abstract Copyright:

Journal keyword(s): galaxy: globular clusters: individual: NGC6352 - stars: horizontal-branch - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/493/913): table1.dat ew.dat abun.dat>

Nomenclature: Table 1, Fig.1: Cl* NGC 6352 FPJ N (Nos 1-9).

CDS comments: Paragraph.6.2 NGC 6253 is a misprint for NGC 6352.

Simbad objects: 29

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Number of rows : 29
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3676 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9990 1
3 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1200 2
4 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1255 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15667 1
6 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 747 0
7 * 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 2199 0
8 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 426 0
9 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1739 0
10 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 361 0
11 NGC 6352 253 * 17 25 29.7515553250 -48 26 38.030178004   16.66 14.92   13.71 ~ 3 0
12 Cl* NGC 6352 ALC 151 * 17 25 30.3311433898 -48 26 36.281246833   16.42 15.25   14.09 ~ 2 0
13 NGC 6352 252 * 17 25 30.5568981240 -48 26 30.844802509   18.24 17.37   16.17 ~ 3 0
14 Cl* NGC 6352 FPJ 1 * 17 25 30.749 -48 25 33.11     15.32   14.04 ~ 1 0
15 NGC 6352 250 * 17 25 32.1989945039 -48 26 24.046132717     15.28   14.12 ~ 3 0
16 NGC 6352 56 * 17 25 34.1777243094 -48 25 41.328446410     15.24   14.06 ~ 3 0
17 NGC 6352 220 * 17 25 36.206 -48 25 13.50     15.34   14.01 ~ 2 0
18 NGC 6352 237 * 17 25 37.4378257093 -48 26 11.667731016     15.22   14.05 ~ 3 0
19 NGC 6352 234 * 17 25 38.1809655988 -48 25 58.389178665   16.58 15.28   14.08 ~ 3 0
20 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 277 0
21 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 150 0
22 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 845 1
23 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 810 0
24 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 490 0
25 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 563 0
26 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 925 0
27 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1057 0
28 NAME Galactic Bulge reg ~ ~           ~ 3715 0
29 NAME Local Group GrG ~ ~           ~ 7440 0

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2021.12.02-08:33:15

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