2009A&A...507..405B


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.28CEST03:12:25

2009A&A...507..405B - Astronomy and Astrophysics, volume 507, 405-415 (2009/11-3)

VLT-FLAMES analysis of 8 giants in the bulge metal-poor globular cluster NGC 6522: oldest cluster in the Galaxy? Analysis of 8 giants in NGC 6522.

BARBUY B., ZOCCALI M., ORTOLANI S., HILL V., MINNITI D., BICA E., RENZINI A. and GOMEZ A.

Abstract (from CDS):

NGC 6522 has been the first metal-poor globular cluster identified in the bulge by Baade. Despite its importance, very few high-resolution abundance analyses of stars in this cluster are available. The bulge metal-poor clusters may be important tracers of the early chemical enrichment of the Galaxy. The main purpose of this study is to determine metallicity and elemental ratios in individual stars of NGC 6522. High-resolution spectra of 8 giants of the bulge's globular cluster NGC 6522 were obtained at the 8m VLT UT2-Kueyen telescope with the FLAMES+GIRAFFE spectrograph. Multiband V,I,J,Ks photometry was used to derive effective temperatures as reference values. Spectroscopic parameters were derived from FeI and FeII lines, and adopted for the derivation of abundance ratios. The present analysis provides a metallicity [Fe/H]=-1.0±0.2. The α-elements oxygen, magnesium and silicon show [O/Fe]=+0.4±0.3, [Mg/Fe]=[Si/Fe]=+0.25±0.15, whereas calcium and titanium show shallower ratios of [Ca/Fe]=[Ti/Fe]=+0.15±0.15. The neutron-capture r-process element europium appears to be overabundant by [Eu/Fe]=+0.4±0.4. The neutron-capture s-elements lanthanum and barium are enhanced by [La/Fe]=+0.35±0.2 and [Ba/Fe]=+0.5±0.5. The large internal errors, indicating the large star-to-star variation in the barium and europium abundances, are also discussed. The moderate metallicity combined to a blue horizontal branch (BHB), are characteristics similar to those of HP 1 and NGC 6558, pointing to a population of very old globular clusters in the Galactic bulge. Also, the abundance ratios in NGC 6522 resemble those in HP 1 and NGC 6558. The ultimate conclusion is that the bulge is old, and went through an early prompt chemical enrichment.

Abstract Copyright:

Journal keyword(s): stars: abundances - galaxy: bulge - galaxy: globular clusters: individual: NGC 6522

Nomenclature: Tables 2-4: [BZO2009] A-NNN N=9.

Simbad objects: 47

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Number of rows : 47

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3569 0
2 Cl Pal 1 GlC 03 33 20.04 +79 34 51.8   17.2       ~ 200 1
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3020 0
4 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1781 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1683 0
6 NGC 6325 GlC 17 17 59.27 -23 45 57.7   11.49       ~ 140 0
7 NGC 6355 GlC 17 23 58.65 -26 21 12.3   12.46 11.05     ~ 126 0
8 ESO 454-29 GlC 17 27 33.24 -30 48 07.8           ~ 211 0
9 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 262 0
10 GCl 66.1 GlC 17 30 38.90 -31 35 44.0           ~ 97 0
11 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 131 0
12 C 1730-333 GlC 17 33 24.50 -33 23 20.0           ~ 208 2
13 ESO 455-23 GlC 17 35 47.80 -30 28 11.0           ~ 200 0
14 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 809 1
15 ESO 520-21 GlC 17 43 42.20 -26 13 21.0           ~ 144 0
16 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11692 0
17 NAME cl Djorgovski 1 GlC 17 47 28.30 -33 03 56.0           ~ 57 0
18 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 699 1
19 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 771 0
20 ESO 455-49 GlC 17 50 46.40 -31 16 31.0           ~ 153 0
21 NGC 6453 GlC 17 50 51.77 -34 35 55.1   10.49       ~ 130 0
22 NAME UKS 1 GlC 17 54 27.20 -24 08 43.0           ~ 66 0
23 GCl 80.1 GlC 18 01 38.80 -26 50 23.0           ~ 86 0
24 ESO 456-38 GlC 18 01 49.10 -27 49 33.0           ~ 57 0
25 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 73 0
26 NAME Baade Window reg 18 03.5 -30 01           ~ 535 3
27 [BZO2009] B-122 * 18 03 33.3582320567 -30 01 58.747401711     16.00   14.280 ~ 8 0
28 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 455 1
29 [BZO2009] B-108 * 18 03 35.2053339476 -30 02 05.628963315     16.29   14.403 ~ 4 0
30 UCAC3 120-361848 mul 18 03 36.408 -30 02 22.14     16.40 15.11 14.69 ~ 3 0
31 UCAC3 120-361873 * 18 03 36.5963155073 -30 02 16.463106350     15.98 15.56 15.40 ~ 12 0
32 Cl* NGC 6522 ARP 2091 * 18 03 41.0126109802 -30 03 03.411884262     16.302   14.642 ~ 9 0
33 Cl* NGC 6522 ARP 2006 * 18 03 41.1796782899 -30 02 21.965643519   16.76 16.039 15.52 14.30 ~ 4 0
34 Cl* NGC 6522 ARP 2187 * 18 03 42.2568842794 -30 03 40.445890443   17.39 16.014 15.70 14.36 ~ 13 0
35 Cl* NGC 6522 ARP 2008 * 18 03 44.6345452534 -30 02 10.845200999     16.260 16.06 14.35 ~ 9 0
36 Cl* NGC 6522 ARP 1216 * 18 03 46.0530942299 -30 00 51.307192985     15.994   14.19 ~ 8 0
37 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 466 0
38 NGC 6540 GlC 18 06 08.60 -27 45 55.0           ~ 90 0
39 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 537 0
40 NGC 6558 GlC 18 10 18.38 -31 45 48.6   12.39 11.29     ~ 179 0
41 ESO 456-78 GlC 18 14 06.600 -28 38 06.00           ~ 34 0
42 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 665 0
43 NGC 6642 GlC 18 31 54.23 -23 28 34.1   11.30 10.24     ~ 162 0
44 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 362 0
45 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1028 0
46 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 451 0
47 NAME Galactic Bulge reg ~ ~           ~ 3436 0

    Equat.    Gal    SGal    Ecl

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2020.09.28-03:12:25

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