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Seminários de Astronomia: Chemical Abundances of giant and dwarf stars and hints on planetary formation — Letícia Ferreira (UERJ)
28 de junho de 2017:12:30 - 13:30
In several instances chemical abundances of main-sequence and giant stars are used simultaneously under the assumption that they share the same abundance scale. This assumption, if wrong, might have important implications in different astrophysical contexts. For instance, our understanding about planet formation may depend on our knowledge of the host stars. Although the metallicity seems to be strongly correlated with the presence of giant planets in FGK main sequence stars, there is some controversy for the giants stars hosting planets. In parallel, the behavior for the other elements is less clear. For example, whether the planet formation can affect the chemical composition of the host stars is not well established. It is therefore crucial to understand whether the metallicity or abundance differences among dwarfs and giants are real or are produced by systematic errors in the analysis. Open Clusters are ideal sites to address this topic because they are composed of stars that share the same overall chemical composition. In this talk I will present a methodology capable of producing a consistent metallicity scale for giants and dwarfs applied to the Hyades OC. I will also present an overview of our project which aims to explore stars with planets in such environments.