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Model physics in low-mass solar-type stars: atomic diffusion and metallicity mixture

B. Nsamba, T. L. Campante, M. J. P. F. G. Monteiro, M. S. Cunha, B. M. Rendle, D. R. Reese, K. Verma

Abstract
Using asteroseismic data from the Kepler satellite, we explore the systematic uncertainties arising from changes in the input physics used when constructing evolution models of solar-type stars. We assess the impact of including atomic diffusion and of varying the metallicity mixture on the determination of global stellar parameters (i.e., radius, mass, and age). We find significant systematic uncertainties on global stellar parameters when diffusion is included in stellar grids. Furthermore, we find the systematic uncertainties on the global stellar parameters to be comparable to the statistical uncertainties when a different metallicity mixture is employed in stellar grids.

Keywords
Astrophysics - Solar and Stellar Astrophysics

PHOST “Physics of Oscillating Stars” – a conference in honour of Prof. H. Shibahashi
J. Ballot, S. Vauclair, G. Vauclair

Zenodo
2018 October

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