CDS

2005A&A...438..875Y

Query : 2005A&A...438..875Y

2005A&A...438..875Y - Astronomy and Astrophysics, volume 438, 875-888 (2005/8-2)

Abundances in giant stars of the globular cluster NGC 6752.

YONG D., GRUNDAHL F., NISSEN P.E., JENSEN H.R. and LAMBERT D.L.

Abstract (from CDS):

Recent theoretical yields and chemical evolution models demonstrate that intermediate-mass AGB stars cannot reproduce the observed abundance distributions of O, Na, Mg, and Al. As a further observational test of this finding, we present elemental abundance ratios [X/Fe] for 20 elements in 38 bright giants of the globular cluster NGC 6752 based on high-resolution, high signal-to-noise spectra obtained with UVES on the VLT. This is the most complete spectroscopic analysis of this cluster in terms of the number of elements considered and the number of stars in the sample. The stars span more than 1000K in effective temperature and more than 3 visual magnitudes along the red giant branch. None of the abundance ratios [X/Fe] show a correlation with evolutionary status. For Si and heavier elements, the small scatter in [X/Fe] may be attributable to the measurement uncertainties. Our mean abundance ratios [X/Fe] are in good agreement with previous studies of this cluster and are also consistent with other globular clusters and field stars at the same metallicity. The mean abundance ratios [Ba/Eu] and [La/Eu] exhibit values, in agreement with field stars at the same metallicity, that lie approximately midway between the pure r-process and the solar (s-process + r-process) mix, indicating that AGB stars have played a role in the chemical evolution of the proto-cluster gas. For the first time, we find possible evidence for an abundance variation for elements heavier than Al in this cluster. We find a correlation between [Si/Fe] and [Al/Fe] which is consistent with the abundance anomalies being synthesized via proton captures at high temperatures. Leakage from the Mg-Al chain into 28Si may explain the Si excess in stars with the highest [Al/Fe]. We identify correlations between [Y/Fe] and [Al/Fe], [Zr/Fe] and [Al/Fe], and [Ba/Fe] and [Al/Fe] suggesting that Y, Zr, and Ba abundances may increase by about 0.1dex as Al increases by about 1.3dex. While the correlations are statistically significant, the amplitudes of the variations are small. If the small variations in Y, Zr, and Ba are indeed real, then the synthesis of the Al anomalies must have taken place within an unknown class of stars that also ran the s-process.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: general - globular clusters: individual: NGC 6752 - stars: abundances - stars: evolution - stars: fundamental parameters

Nomenclature: Table 1, col(2): Cl* NGC 6752 YGN NN N=21 among (Nos 0-30).

Simbad objects: 54

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Number of rows : 54
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3839 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1025 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1056 0
4 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 853 0
5 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2449 0
6 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1945 0
7 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1817 0
8 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2168 0
9 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 770 0
10 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2072 0
11 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1940 0
12 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2118 2
13 Cl* NGC 6752 BUON 4446 RG* 19 10 14.9559748296 -59 59 13.414731468   14.59 13.78     ~ 13 0
14 Cl* NGC 6752 YGN 29 RG* 19 10 16.6112031624 -60 00 59.767765308     14.18     ~ 8 0
15 Cl* NGC 6752 BUON 4216 RG* 19 10 19.5305698584 -60 00 30.156575040   14.520 13.698     ~ 13 0
16 NGC 6752 67 RG* 19 10 25.9459355640 -59 59 05.050889808   14.38 13.59     ~ 14 0
17 NGC 6752 68 Pe* 19 10 27.8253318048 -59 59 49.277291352   13.08 12.01     ~ 11 0
18 NGC 6752 59 RG* 19 10 32.2389415152 -59 57 07.286053500   12.58 10.887     M 34 0
19 Cl* NGC 6752 YGN 6 * 19 10 34.3616645352 -59 59 55.028925744   14.43 13.40     ~ 7 0
20 NGC 6752 57 RG* 19 10 36.4928689368 -59 56 07.703392560   14.62 14.00     ~ 14 0
21 Cl* NGC 6752 CS 3 * 19 10 38.3083769568 -60 04 14.036835684   12.75 11.49     ~ 24 0
22 Cl* NGC 6752 YGN 30 Pe* 19 10 38.8613425608 -59 59 47.296470264     14.19     ~ 9 0
23 Cl* NGC 6752 MG 9 * 19 10 40 -59 58.2     11.52     ~ 6 0
24 Cl* NGC 6752 MG 4 RG* 19 10 42.4523924616 -59 59 54.774894048     11.02 10.72   ~ 6 0
25 Cl* NGC 6752 CBG 14537 RG* 19 10 43.802 -59 59 41.65   14.913 14.135     ~ 13 0
26 Cl* NGC 6752 BUON 3103 * 19 10 45 -59 58.3     13.56     ~ 7 0
27 NGC 6752 55 RG* 19 10 46.1704717344 -59 56 26.704204764   13.40 12.24     ~ 15 0
28 Cl* NGC 6752 YGN 1 * 19 10 47 -60 00.7     13.27     ~ 6 0
29 NGC 6752 5 RG* 19 10 48.6380923344 -60 01 55.414478928   14.402 13.743 13.633   ~ 14 0
30 Cl* NGC 6752 MG 5 * 19 10 48.7907969856 -59 59 38.163522408     11.03     ~ 4 0
31 Cl* NGC 6752 BUON 2728 RG* 19 10 49.9412104080 -60 02 25.640269368   14.528 13.697     ~ 11 0
32 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1964 0
33 NGC 6752 45 * 19 10 53.2459770888 -59 57 15.307148160   12.78 11.54     ~ 15 0
34 2MASS J19105326-6002037 RG* 19 10 53.2773937224 -60 02 03.672736152   13.06 12.060     ~ 25 0
35 Cl* NGC 6752 YGN 7 * 19 10 56.6307863736 -60 00 41.575798368   14.30 13.46     ~ 5 0
36 Cl* NGC 6752 MG 0 RG* 19 10 57.3561547752 -59 58 05.671541964   12.29 10.70 10.477 9.40 ~ 12 0
37 NGC 6752 44 * 19 10 57.3799842984 -59 57 03.652270020   12.94 11.60     ~ 8 0
38 Cl* NGC 6752 YGN 3 RG* 19 10 59.6123988384 -59 56 40.510533516   14.27 13.35     ~ 9 0
39 2MASS J19110109-5957226 RG* 19 11 01.1111967360 -59 57 22.632070284   12.88 11.68     ~ 14 0
40 Cl* NGC 6752 YGN 0 * 19 11 03 -59 59.5     13.03     ~ 4 0
41 NGC 6752 12 RG* 19 11 03.0386317824 -60 01 48.903366252   12.60 11.245     K 29 0
42 NGC 6752 28 RG* 19 11 11.1684637896 -60 00 16.942232952   14.07 13.33     ~ 15 0
43 Cl* NGC 6752 GA 31 LP? 19 11 11.2981038888 -59 59 55.426567308   12.52 10.833     M 35 0
44 NGC 6752 37 RG* 19 11 11.6425951848 -59 58 28.749173376   14.89 14.08     ~ 16 0
45 NGC 6752 17 RG* 19 11 13.4059513224 -60 02 30.244768548   14.85 14.06     ~ 16 0
46 NGC 6752 29 RG* 19 11 14.3927402376 -60 00 32.223800196   13.006 11.867     ~ 31 0
47 NGC 6752 18 Pe* 19 11 16.8665683920 -60 03 10.615523796   12.32 10.99     ~ 10 0
48 NGC 6752 32 RG* 19 11 18.5097639600 -59 59 41.691616980   14.58 13.63     ~ 13 0
49 NGC 6752 30 RG* 19 11 19.4663098272 -60 00 34.729621596   13.27 12.195     ~ 25 0
50 Cl* NGC 6752 BUON 1113 RG* 19 11 23.1147114120 -59 59 39.720399864   14.815 14.002     ~ 15 0
51 Cl* NGC 6752 YGN 4 RG* 19 11 32.6634739224 -60 00 02.105715024   14.322 13.491     ~ 14 0
52 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1107 0
53 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3102 0
54 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 510 0

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2023.09.23-15:51:59

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