English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The light elements Li, O, Na, Al, and Mg are known to show star to starvariations in the globular clusters 47 Tuc and NGC 6752. Such variations areinterpreted as due to processing in a previous generation of stars. In thispaper we investigate the abundances of the alpha-element sulphur, for which noprevious measurements exist. In fact this element has not been investigated inany Galactic globular cluster so far. The only globular cluster for which suchmeasurements are available is Terzan 7, which belongs to the Sgr dSph. We usehigh resolution spectra of the S I Mult. 1, acquired with the UVES spectrographat the 8.2m VLT-Kueyen telescope, for turn-off and giant stars in the twoglobular clusters. The spectra are analyzed making use of ATLAS static planeparallel model atmospheres and SYNTHE spectrum synthesis. We also compute 3Dcorrections from CO5BOLD hydrodynamic models and apply corrections due to NLTEeffects taken from the literature. In the cluster NGC 6752 sulphur has beenmeasured only in four subgiant stars. We find no significant star to starscatter and a mean <[S/Fe]> = +0.49 +- 0.15, consistent with what observed infield stars of the same metallicity. In the cluster 47 Tuc we measured S in 4turn-off and 5 subgiant stars with a mean <[S/Fe]> = +0.18 +- 0.14. While thisresult is compatible with no star to star scatter we notice a statisticallysignificant correlation of the sulphur abundance with the sodium abundance anda tentative correlation with the silicon abundance.

Sulphur in the Globular Clusters 47 Tucanae and NGC 6752