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Optimization methods in Stellar Astrophysics: The derivation of stellar parameters

Sérgio F. A. Batista

Spectroscopy provides a powerful technique to derive stellar parameters for FGK-type stars. These derivations are done by measuring the equivalent widths of weak FeI and FeII absorption lines and then compute the measured abundances assuming LTE conditions. The solution found must satisfy the ionization and excitation equilibrium conditions as well as the independence between the metallicity and the measured equivalent widths. The standard method compares theoretical models with the observations. The latter is done through an iterative process until the best model, which fits the observations, is found.
In this talk, I will present some optimization methods that can be applied to the described problem and I will discuss their implementation. I will also stress out some of the obtained results.

2013 November 27, 13:30

Centro de Astrofísica da Universidade do Porto (Classroom)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia