Probing the parameter space of HD 49933: a comparison between global and local methods
Abstract
We present two independent methods for studying the global stellar parameter space (mass M, age, initial chemical composition X0, Z0) of HD 49933 with seismic data. Using a local minimization and an MCMC algorithm, we obtain consistent results for the determination of the stellar properties: M = 1.1 - 1.2 Msolar, Age ~ 3.0 Gyr, Z0 ~ 0.008. A description of the error ellipses can be defined using Singular Value Decomposition techniques, and this is validated by comparing the errors with those from the MCMC method.
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