The consistency of chemical clocks among coeval stars

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dc.contributor.advisorChanamé, Julio
dc.contributor.authorEspinoza Rojas, Francisca
dc.contributor.otherPontificia Universidad Católica de Chile. Instituto de Astrofísica
dc.date.accessioned2021-11-04T16:51:45Z
dc.date.available2021-11-04T16:51:45Z
dc.date.issued2021
dc.date.updated2021-10-22T04:10:05Z
dc.descriptionTesis (Master in Astrophysics)--Pontificia Universidad Católica de Chile, 2021
dc.description.abstractThe abundance ratios of some chemical species have been found to correlate with stellar age, leading to the possibility of using measurements of abundances in stellar atmospheres as age indicators thanks to the Galactic chemical evolution. These chemical clocks have been calibrated with solar-twins, open clusters and red giants, however, how effective they are in identifying coeval systems has not been tested for populations that sample a broader parameter space. In that sense, wide binary systems are the perfect objects to assess the applications of chemical clocks, because their components have a common origin and are separated by great distances, so they should not interact with each other, and their abundances and ages are expected to be consistent. In this thesis, I determined the abundances of a sample of 5 wide binaries and collected data for other 31 systems from the literature in order to test the applicability of chemical clocks. I found that wide binaries have more consistent abundances than random pairs. I also found that chemical clocks are even more consistent among the components of wide binaries than their [X/Fe] ratios. Not only that, but the special case of the pair HIP 34426/HIP 34407 would indicate that chemical clocks are consistent for coeval stars even when their abundances are not. Finally, given the evidence that chemical clocks trace information about stellar birthplaces and chemical evolution, I briefly studied their benefits for chemical tagging by using them to reconstruct a sample of 3 open clusters, and found that chemical clocks do not improve the identification of the cluster’s members, but could be used for decontamination. Despite this, the results are limited by the age range of the sample, and there is still much work that could be done to better evaluate this idea and find more applications for chemical clocks.
dc.format.extentv, 71 páginas
dc.fuente.origenAutoarchivo
dc.identifier.doi10.7764/tesisUC/AST/62919
dc.identifier.urihttps://doi.org/10.7764/tesisUC/AST/62919
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/62919
dc.information.autorucInstituto de Astrofísica ; Chanamé, Julio ; 0000-0003-2481-4546 ; 104380
dc.information.autorucInstituto de Astrofísica ; Espinoza Rojas, Francisca ; S/I ; 245267
dc.language.isoen
dc.nota.accesoContenido completo
dc.rightsacceso abierto
dc.subject.ddc523.88
dc.subject.deweyAstronomíaes_ES
dc.subject.otherEstrellas - Formaciónes_ES
dc.subject.otherEstrellas - Evoluciónes_ES
dc.titleThe consistency of chemical clocks among coeval starses_ES
dc.typetesis de maestría
sipa.codpersvinculados104380
sipa.codpersvinculados245267
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