2009A&A...503..121S


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST12:18:23

2009A&A...503..121S - Astronomy and Astrophysics, volume 503, 121-127 (2009/8-3)

Sulfur in the globular clusters 47 Tucanae and NGC 6752.

SBORDONE L., LIMONGI M., CHIEFFI A., CAFFAU E., LUDWIG H.-G. and BONIFACIO P.

Abstract (from CDS):

The light elements Li, O, Na, Al, and Mg are known to show star-to-star variations in the globular clusters 47 Tuc and NGC 6752. Such variations are interpreted as coming from processing in a previous generation of stars. In this paper we investigate the abundances of the α-element sulfur, for which no previous measurements exist. In fact this element has not been investigated in any Galactic globular cluster so far. The only globular cluster for which such measurements are available is Terzan 7, which belongs to the Sgr dSph. We use high-resolution spectra of the SI Mult. 1, acquired with the UVES spectrograph at the 8.2m VLT-Kueyen telescope, for turn-off and giant stars in the two globular clusters. The spectra were analysed making use of ATLAS static plane parallel model atmospheres and SYNTHE spectrum synthesis. We also compute 3D corrections from CO5BOLD hydrodynamic models and apply corrections due to NLTE effects taken from the literature. In the cluster NGC 6752 sulfur has been measured only in four subgiant stars. We find no significant star-to-star scatter and a mean <[S/Fe]≥+0.49±0.15, consistent with what is observed in field stars of the same metallicity. In the cluster 47 Tuc we measured S in 4 turn-off and 5 subgiant stars with a mean <[S/Fe]≥+0.18±0.14. While this result is compatible with no star-to-star scatter we notice a statistically significant correlation of the sulfur abundance with the sodium abundance and a tentative correlation with the silicon abundance. The sulfur-sodium correlation is not easily explained in terms of nucleosynthesis. An origin due to atomic diffusion can be easily dismissed. The correlation cannot be easily dismissed either, in view of its statistical significance, until better data for more stars is available.

Abstract Copyright:

Journal keyword(s): stars: abundances - Galaxy: globular clusters: individual: NGC 104 - Galaxy: globular clusters: individual: NGC 6752

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 Cl* NGC 104 GVS 206415 * 00 19 36.40 -71 58 57.0           ~ 4 0
2 Cl* NGC 104 GVS 429 * 00 20 18.9980927880 -72 01 11.188448877   16.699 19.022     ~ 4 0
3 Cl* NGC 104 GVS 975 * 00 20 52.30 -71 58 01.8   17.919 17.322     ~ 6 0
4 Cl* NGC 104 GVS 1081 * 00 21 03.82 -72 06 57.7   17.962 17.375     ~ 6 0
5 Cl* NGC 104 GVS 482 * 00 21 10.88 -72 04 15.2   17.352 18.097     ~ 4 0
6 Cl* NGC 104 GVS 1012 * 00 21 26.5743753535 -72 00 37.148937241   17.942 17.361     ~ 6 0
7 Cl* NGC 104 GVS 952 * 00 21 39.140 -72 02 53.73   17.917 17.36     ~ 2 0
8 Cl* NGC 104 GVS 433 * 00 21 49.24 -72 02 54.1   17.502 16.723     ~ 4 0
9 Cl* NGC 104 GVS 201075 * 00 22 00.40 -72 05 59.4           ~ 5 0
10 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3463 0
11 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1751 1
12 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1641 2
13 Cl* NGC 6752 GVS 1481 * 19 10 19.68 -60 01 27.8     15.95     ~ 6 0
14 Cl* NGC 6752 GVS 4661 * 19 10 20.98 -60 01 47.6     17.216     ~ 7 0
15 Cl* NGC 6752 GVS 1406 * 19 10 22.32 -60 03 19.7     15.90     ~ 6 0
16 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1764 0
17 Cl* NGC 6752 GVS 1665 * 19 11 05.0162182946 -59 55 27.386111879     16.08     ~ 7 0
18 Cl* NGC 6752 GVS 1461 * 19 11 05.18 -60 01 51.2     15.95     ~ 6 0
19 Cl* NGC 6752 GVS 5048 * 19 11 19.958 -59 59 50.52     16.10     ~ 8 0
20 Cl* NGC 6752 GVS 4907 * 19 11 22.87 -60 03 57.6     17.199     ~ 8 0
21 Cl* NGC 6752 GVS 200613 * 19 11 35.7505905495 -59 58 02.022078398           ~ 10 0
22 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 341 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-12:18:23

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