Sulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5, and Trumpler 20

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dc.contributor.authorLucertini, F.
dc.contributor.authorMonaco, L.
dc.contributor.authorCaffau, E.
dc.contributor.authorMucciarelli, A.
dc.contributor.authorVillanova, S.
dc.contributor.authorBonifacio, P.
dc.contributor.authorSbordone, L.
dc.date.accessioned2023-07-26T16:46:41Z
dc.date.available2023-07-26T16:46:41Z
dc.date.issued2023-03-01
dc.descriptionIndexación Scopuses
dc.description.abstractContext. Sulfur (S) is one of the lesser-studied α-elements. Published investigations of its behavior have so far focused on local stars, and only a few clusters of the Milky Way have been considered to study this topic. We aim to study the S content of the globular cluster Ruprecht 106 which has never before been studied for this purpose, but is known to present low levels of the [α/Fe] abundance ratio and the open cluster Trumpler 5. The only star studied so far in Trumpler 5 shows an unexpectedly low abundance of S. Aims. With this work, we aim to provide the first S abundance in Ruprecht 106 and to investigate the S content of Trumpler 5 with a larger sample of stars. The open cluster Trumpler 20 is considered as a reference object. Methods. We performed a standard abundance analysis based on 1D model atmospheres in local thermodynamical equilibrium (LTE) and on high-resolution and high-signal-to-noise-ratio UVES-slit and UVES/FLAMES spectra. We also applied corrections for nonLTE. The metallicities of the targets were obtained by studying equivalent widths. Sulfur abundances were derived from multiplets 1, 6, and 8 by spectrosynthesis. Results. We find that the metallicities of Ruprecht 106 and Trumpler 5 are [Fe/H] = 1.37±0.11 and [Fe/H] = 0.49±0.14, respectively. Ruprecht 106 is less S-rich than the other Galactic clusters at similar metallicity. The low S content of Ruprecht 106, [S/Fe]NLTE = 0.52±0.13, is consistent with its shortage of α-elements. This supports an extra-galactic origin of this cluster. We obtained a new and more robust S content value of Trumpler 5 of about [S/Fe]NLTE = 0.05±0.20. According to our results, Trumpler 5 follows the trend of the Galactic disk in the [S/Fe]LTE versus [Fe/H] diagram. Our results for Trumpler 20, of namely [Fe/H]= 0.06±0.15 and [S/Fe]NLTE = 0.28±0.21, are in agreement with those in the literature.es
dc.identifier.citationAstronomy and Astrophysics Volume 67 11 March 2023 Article number A137es
dc.identifier.doi10.1051/0004-6361/202244646en
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/52012
dc.language.isoenes
dc.publisherAstronomy and Astrophysicses
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.esen
dc.subjectstars: abundanceses
dc.subjectglobular clusters: individual: Rup106es
dc.subjectopen clusters and associations: individual: Tr5es
dc.subjectopen clusters and associations: individual: Tr20es
dc.titleSulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5, and Trumpler 20es
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