2006A&A...455..271G


Query : 2006A&A...455..271G

2006A&A...455..271G - Astronomy and Astrophysics, volume 455, 271-281 (2006/8-3)

Na-O anticorrelation and HB. III. The abundances of NGC 6441 from FLAMES-UVES spectra.

GRATTON R.G., LUCATELLO S., BRAGAGLIA A., CARRETTA E., MOMANY Y., PANCINO E. and VALENTI E.

Abstract (from CDS):

The aim of the present work is to determine accurate metallicities for a group of red giant branch stars in the field of the bulge Globular Cluster NGC 6441. This is the third paper in a series resulting from a large project aimed at determining the extent of the Na-O anticorrelation among Globular Cluster stars and exploring its relationship with HB morphology. We present an LTE abundance analysis of these objects, based on data gathered with the FLAMES fiber facility and the UVES spectrograph at VLT2. Five of the thirteen stars observed are members of the cluster. The average Fe abundance for these five stars is [Fe/H]=-0.39±0.04±0.05dex, where the first error bar includes the uncertainties related to star-to-star random errors, and the second one the systematic effects related to the various assumptions made in the analysis. The overall abundance pattern is quite typical of Globular Clusters, with an excess of the α-elements and of Eu. There is evidence that the stars of NGC 6441 are enriched in Na and Al, while they have been depleted of O and Mg by H-burning at high temperatures, analogous with extensive observations of other Globular Clusters: in particular, one star is clearly Na and Al-rich and O and Mg-poor. We also obtained quite high V abundances, but it is possible that this is an artifact of the analysis, since similar high V abundances are also derived for the field stars. These last are all more metal-rich than NGC 6441 and probably belong to the bulge population.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: population II - Galaxy: globular clusters: general - galaxies: clusters: individual: NGC 6441

VizieR on-line data: <Available at CDS (J/A+A/455/271): table2.dat table3.dat table4.dat>

Nomenclature: Table 2: Cl* NGC 6441 GLB NNNNNNN N=13 among (Nos 6003734-8003092).

Simbad objects: 21

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Number of rows : 21
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 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1340 0
2 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 865 1
3 Cl* NGC 6441 GLB 6003734 * 17 49 41.32 -36 57 12.0     15.992   13.909 ~ 1 0
4 Cl* NGC 6441 GLB 6005341 * 17 49 47.2193629632 -36 58 05.436579720     16.294   14.199 ~ 1 0
5 Cl* NGC 6441 GLB 6005308 * 17 49 51.1 -37 04 54     16.290   14.317 ~ 1 0
6 Cl* NGC 6441 GLB 6004360 * 17 49 54.0 -37 08 50     16.127   14.148 ~ 1 0
7 Cl* NGC 6441 GLB 7004463 * 17 50 01.4 -37 03 26     16.146   13.986 ~ 2 0
8 Cl* NGC 6441 GLB 7004487 * 17 50 04.9211644032 -37 03 12.536993196     16.150   14.062 ~ 2 0
9 Cl* NGC 6441 GLB 7004453 * 17 50 05.9869405056 -37 00 39.117622608     16.144   14.115 ~ 1 0
10 Cl* NGC 6441 GLB 7004434 * 17 50 09.8 -37 05 06     16.142   13.975 ~ 2 0
11 Cl* NGC 6441 GLB 7004050 * 17 50 10.25 -37 04 45.8     16.062   13.894 ~ 2 0
12 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 830 0
13 Cl* NGC 6441 GLB 7004329 * 17 50 19.4513433024 -37 09 41.016318732     16.120   14.123 ~ 1 0
14 Cl* NGC 6441 GLB 7003717 * 17 50 22.3150926384 -36 59 55.260055140     15.989   13.876 ~ 1 0
15 Cl* NGC 6441 GLB 8002961 * 17 50 40.7584762680 -37 04 20.900297136     15.798   13.613 ~ 1 0
16 Cl* NGC 6441 GLB 8003092 * 17 51 00.8136038904 -37 03 43.848755460     15.832   13.629 ~ 1 0
17 NAME Baade Window reg 18 03.5 -30 01           ~ 576 3
18 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 500 0
19 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 574 0
20 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1970 2
21 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 401 0

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2022.08.10-06:55:55

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