2004A&A...414.1071J

Query : 2004A&A...414.1071J

2004A&A...414.1071J - Astronomy and Astrophysics, volume 414, 1071-1079 (2004/2-2)

Heavy elements abundances in turn-off stars and early subgiants in NGC 6752.

JAMES G., FRANCOIS P., BONIFACIO P., BRAGAGLIA A., CARRETTA E., CENTURION M., CLEMENTINI G., DESIDERA S., GRATTON R.G., GRUNDAHL F., LUCATELLO S., MOLARO P., PASQUINI L., SNEDEN C. and SPITE F.

Abstract (from CDS):

High resolution spectra (R≥40000) for 9 main sequence turn-off stars and 9 subgiants in the globular cluster NGC 6752 were acquired with UVES on the VLT-Kueyen (UT2). These data have been used to determine the abundances of some heavy elements (strontium, yttrium, barium and europium). This paper presents for the first time accurate results for heavy elements in this globular cluster. We did not find any systematic effect between the abundances found in turn-off stars, subgiants, and giants. We obtain the following mean abundances for these elements in our sample (turn-off stars and subgiants): [Sr/Fe]=0.06±0.16, [Y/Fe]=-0.01±0.12, [Ba/Fe]=0.18±0.11, and [Eu/Fe]=0.41±0.09. The dispersion in the abundance ratios of the different elements is low and can be totally explained by uncertainties in their derivation. These ratios are in agreement with the values found in field halo stars with the same metallicity. We did not observe any correlation between the [n-capture/Fe] ratios and the star-to-star variations of the O and Na abundances. The [Ba/Eu] and [Sr/Ba] ratios show clearly that this globular cluster has also been uniformly enriched by r- and s-process synthesis.

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Journal keyword(s): stars: abundances - Galaxy: globular clusters: individual: NGC 6752

CDS comments: Table 1 : Sources Grundahl = Cl* NGC 6752 GVS NNNNNN, from an unpublished list of Grundahl+. See 'The Galactic Halo: from Globular Clusters to field Stars', Proceedings of the 35th Liege International Astrophysics Colloquium, ed. A. Noels, P. Magain, & D. Caro, Institut d'Astrophysique et de Geophysique, Liege, 503.

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3914 0
2 BD-16 251 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 291 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3425 0
4 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1975 0
5 Cl* NGC 6752 GVS 1481 * 19 10 19.68 -60 01 27.8     15.95     ~ 6 0
6 Cl* NGC 6752 GVS 4661 * 19 10 20.98 -60 01 47.6     17.216     ~ 7 0
7 Cl* NGC 6752 GVS 1406 * 19 10 22.32 -60 03 19.7     15.90     ~ 6 0
8 Cl* NGC 6752 GVS 1460 * 19 10 23.82 -59 59 07.1     15.94     ~ 5 0
9 Cl* NGC 6752 GVS 4341 * 19 10 29.79 -59 57 52.7     17.149     ~ 6 0
10 Cl* NGC 6752 GVS 1400 * 19 10 31.6223599560 -59 59 34.640838168     15.89     ~ 5 0
11 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
12 Cl* NGC 6752 GVS 202316 * 19 10 59.54 -59 54 00.4           ~ 6 0
13 Cl* NGC 6752 GVS 4428 * 19 10 59.8758025704 -60 02 17.122587576     17.142     ~ 11 0
14 Cl* NGC 6752 GVS 1665 * 19 11 05.0159482728 -59 55 27.384044556     16.08     ~ 8 0
15 Cl* NGC 6752 GVS 1461 * 19 11 05.18 -60 01 51.2     15.95     ~ 6 0
16 Cl* NGC 6752 GVS 1445 * 19 11 05.44 -60 01 45.9     15.89     ~ 5 0
17 Cl* NGC 6752 GVS 202063 * 19 11 05.49 -59 54 28.7           ~ 4 0
18 Cl* NGC 6752 GVS 4383 * 19 11 13.20 -60 02 24.2     17.112     ~ 6 0
19 Cl* NGC 6752 GVS 5048 * 19 11 19.9682198820 -59 59 50.467908818     16.10     ~ 9 0
20 Cl* NGC 6752 GVS 1563 * 19 11 21.3659942016 -59 59 51.012031020     16.06     ~ 6 0
21 Cl* NGC 6752 GVS 4907 * 19 11 22.87 -60 03 57.6     17.199     ~ 8 0
22 Cl* NGC 6752 GVS 4458 * 19 11 26.26 -60 00 48.7     17.155     ~ 6 0
23 Cl* NGC 6752 GVS 200613 * 19 11 35.7511814976 -59 58 02.021234016           ~ 11 0
24 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 448 0

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