The chemical composition of red giants in 47 Tucanae II. Magnesium isotopes and pollution scenarios

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dc.contributor.authorThygesen, A. O.
dc.contributor.authorSbordone, L.
dc.contributor.authorLudwig, H. G.
dc.contributor.authorVentura, P.
dc.contributor.authorYong, D.
dc.contributor.authorCollet, R.
dc.contributor.authorChristlieb, N.
dc.contributor.authorMelendez, J.
dc.contributor.authorZaggia, S.
dc.date.accessioned2024-01-10T14:21:55Z
dc.date.available2024-01-10T14:21:55Z
dc.date.issued2016
dc.description.abstractContext. The phenomenon of multiple populations in globular clusters is still far from understood, with several proposed mechanisms to explain the observed behaviour. The study of elemental and isotopic abundance patterns are crucial for investigating the differences among candidate pollution mechanisms.
dc.description.abstractAims. We derive magnesium isotopic ratios for 13 stars in the globular cluster 47 Tucanae (NGC 104) to provide new, detailed information about the nucleosynthesis that has occurred within the cluster. For the first time, the impact of 3D model stellar atmospheres on the derived Mg isotopic ratios is investigated.
dc.description.abstractMethods. Using both tailored 1D atmospheric models and 3D hydrodynamical models, we derive magnesium isotopic ratios from four features of MgH near 5135 angstrom in 13 giants near the tip of the red giant branch, using high signal-to-noise, high-resolution spectra.
dc.description.abstractResults. We derive the magnesium isotopic ratios for all stars and find no significant off set of the isotopic distribution between the pristine and the polluted populations. Furthermore, we do not detect any statistically significant differences in the spread in the Mg isotopes in either population. No trends were found between the Mg isotopes and [Al/Fe]. The inclusion of 3D atmospheres has a significant impact on the derived Mg-25/Mg-24 ratio, increasing it by a factor of up to 2.5, compared to 1D. The Mg-26/Mg-24 ratio, on the other hand, essentially remains unchanged.
dc.description.abstractConclusions. We confirm the results seen from other globular clusters, where no strong variation in the isotopic ratios is observed between stellar populations, for observed ranges in [Al/Fe]. We see no evidence for any significant activation of the Mg-Al burning chain. The use of 3D atmospheres causes an increase of a factor of up to 2.5 in the fraction of Mg-25, resolving part of the discrepancy between the observed isotopic fraction and the predictions from pollution models.
dc.description.funderGerman Research Foundation (DFG)
dc.description.funderChile's Ministry of Economy, Development, and Tourism's Millennium Science Initiative
dc.description.funderAustralian Research Council Future Fellowship
dc.description.funderDECRA grant from Australian Research Council
dc.fechaingreso.objetodigital2024-05-02
dc.format.extent22 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/201526643
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201526643
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79816
dc.identifier.wosidWOS:000373207800078
dc.information.autorucAstrofísica;Sbordone L;S/I;243032
dc.language.isoen
dc.nota.accesocontenido parcial
dc.publisherEDP SCIENCES S A
dc.revistaASTRONOMY & ASTROPHYSICS
dc.rightsacceso restringido
dc.subjectstars: abundances
dc.subjecttechniques: spectroscopic
dc.subjectmethods: observational
dc.subjectglobular clusters: individual: 47 Tucanae
dc.subjectB-2-SIGMA(+)-X-2-SIGMA(+) VIOLET SYSTEMS
dc.subjectSELF-ENRICHMENT SCENARIO
dc.subjectGLOBULAR-CLUSTERS
dc.subjectMULTIPLE POPULATIONS
dc.subjectABUNDANCE VARIATIONS
dc.subjectA(2)PI-X-2-SIGMA(+) RED
dc.subjectFUNDAMENTAL PARAMETERS
dc.subjectHORIZONTAL-BRANCH
dc.subjectREACTION-RATES
dc.subjectMASSIVE STARS
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleThe chemical composition of red giants in 47 Tucanae II. Magnesium isotopes and pollution scenarios
dc.typeartículo
dc.volumen588
sipa.codpersvinculados243032
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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