2005A&A...441..549P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST00:22:29

2005A&A...441..549P - Astronomy and Astrophysics, volume 441, 549-553 (2005/10-2)

Li in NGC 6752 and the formation of globular clusters.

PASQUINI L., BONIFACIO P., MOLARO P., FRANCOIS P., SPITE F., GRATTON R.G., CARRETTA E. and WOLFF B.

Abstract (from CDS):

Li abundances for 9 Turn-off (TO) stars of the intermediate metallicity cluster ([Fe/H]=-1.4) NGC 6752 are presented. The cluster is known to show abundance anomalies and anticorrelations observed in both evolved and main sequence stars. We find that Li abundance anticorrelates with Na (and N) and correlates with O in these Turn-Off stars. For the first time we observe Pop II hot dwarfs systematically departing from the Spite plateau. The observed anticorrelations are in qualitative agreement with what is expected if the original gas were contaminated by Intermediate Mass AGB - processed material. However, a quantitative comparison shows that none of the existing models can reproduce all the observations at once. The very large amount of processed gas present in the cluster does not imply a ``pollution'', but rather that the whole protocluster cloud was enriched by a previous generation of stars. We finally note that the different abundance patterns in NGC 6397 and NGC 6752 imply different composition of the pre-enrichment ejecta for the two clusters.

Abstract Copyright:

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

Simbad objects: 12

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Number of rows : 12

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 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
2 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1799 1
3 Cl* NGC 6752 GVS 4661 * 19 10 20.98 -60 01 47.6     17.216     ~ 7 0
4 Cl* NGC 6752 GVS 4341 * 19 10 29.79 -59 57 52.7     17.149     ~ 6 0
5 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1807 0
6 Cl* NGC 6752 GVS 202316 * 19 10 59.54 -59 54 00.4           ~ 6 0
7 Cl* NGC 6752 GVS 4428 * 19 10 59.8759168194 -60 02 17.125654492     17.142     ~ 9 0
8 Cl* NGC 6752 GVS 4383 * 19 11 13.20 -60 02 24.2     17.112     ~ 6 0
9 Cl* NGC 6752 GVS 5048 * 19 11 19.958 -59 59 50.52     16.10     ~ 8 0
10 Cl* NGC 6752 GVS 4907 * 19 11 22.87 -60 03 57.6     17.199     ~ 8 0
11 Cl* NGC 6752 GVS 4458 * 19 11 26.26 -60 00 48.7     17.155     ~ 6 0
12 Cl* NGC 6752 GVS 200613 * 19 11 35.7505905495 -59 58 02.022078398           ~ 10 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-00:22:29

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