Relative evolution of eclipsing binaries: A tool for measuring globular cluster ages and He abundances

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dc.article.numberA166
dc.catalogadorgjm
dc.contributor.authorCristi Cambiaso, Nicolas Eduardo
dc.contributor.authorCatelan, Márcio
dc.contributor.authorValcarce, Aldo
dc.contributor.authorPapageorgiou, Athanasios
dc.date.accessioned2025-03-19T14:35:10Z
dc.date.available2025-03-19T14:35:10Z
dc.date.issued2024
dc.description.abstractContext. Globular clusters (GCs) are among the oldest objects in the Universe for which an age can be directly measured; they thus play an important cosmological role. This age depends sensitively on the He abundance, however, which cannot be reliably measured from spectroscopy in GC stars. Detached eclipsing binaries (DEBs) near the turnoff (TO) point may play an important role in this regard. Aims. The aim of this study is to explore the possibility that, by working with differential measurements of stars that comprise a TO binary system and by assuming the two stars have the same age and He abundance, one can achieve tighter, more robust, and less model-dependent constraints on the ages and He abundances than otherwise possible by working with the absolute parameters of the stars. Methods. We compared both the absolute and differential parameters of the stars in V69, a TO DEB pair in the GC 47 Tuc, with two different sets of stellar evolutionary tracks, making use of a Monte Carlo technique to estimate the GC's He abundance and age, along with their uncertainties. Results. We find that the relative approach can produce age and He abundance estimates that are in good agreement with those from the literature. We show that our estimates are also less model-dependent, less sensitive to [Fe/H], and more robust to inherent model systematics than those obtained with an absolute approach. On the other hand, the relative analysis results in larger statistical uncertainties than its absolute counterpart, at least in the case of V69, where the two stars have very similar properties. For binary pairs in which one of the components is less evolved than the other, the statistical uncertainty can be reduced. Conclusions. Our results suggest that the method proposed in this work can be used to robustly constrain the He abundance and ages of GCs.
dc.fechaingreso.objetodigital2025-03-19
dc.format.extent13 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202450427
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202450427
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/102808
dc.identifier.wosidWOS:001351092800023
dc.information.autorucInstituto de Astrofísica; Cristi Cambiaso, Nicolas Eduardo; S/I; 1064513
dc.information.autorucInstituto de Astrofísica; Catelan, Márcio; 0000-0001-6003-8877; 1001556
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaASTRONOMY & ASTROPHYSICS
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0 Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectstars: abundances
dc.subjectbinaries: eclipsing
dc.subjectstars: evolution
dc.subjectstars: individual: V69-47 Tuc
dc.subjectglobular clusters: individual: 47 Tuc
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleRelative evolution of eclipsing binaries: A tool for measuring globular cluster ages and He abundances
dc.typeartículo
dc.volumen691
sipa.codpersvinculados1064513
sipa.codpersvinculados1001556
sipa.trazabilidadWOS;2024-12-14
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