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3D Modeling of the Structure and Dynamics of a Main-Sequence F-type Star

Published online by Cambridge University Press:  24 September 2020

Irina N. Kitiashvili Open the ORCID record for Irina N. Kitiashvili [Opens in a new window]  and
Alan A. Wray
Irina N. Kitiashvili
Affiliation:
NASA Ames Research Center Moffett Field, MS 258-6, Mountain View, USA email: irina.n.kitiashvili@nasa.gov
Alan A. Wray
Affiliation:
NASA Ames Research Center Moffett Field, MS 258-6, Mountain View, USA email: alan.a.wray@nasa.gov
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Abstract

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Current state-of-the-art computational modeling makes it possible to build realistic models of stellar convection zones and atmospheres that take into account chemical composition, radiative effects, ionization, and turbulence. The standard 1D mixing-length-based evolutionary models are not able to capture many physical processes of the stellar interior dynamics. Mixing-length models provide an initial approximation of stellar structure that can be used to initialize 3D radiative hydrodynamics simulations which include realistic modeling of turbulence, radiation, and other phenomena.

In this paper, we present 3D radiative hydrodynamic simulations of an F-type main-sequence star with 1.47 solar mass. The computational domain includes the upper layers of the radiation zone, the entire convection zone, and the photosphere. The effects of stellar rotation is modeled in the f-plane approximation. These simulations provide new insight into the properties of the convective overshoot region, the dynamics of the near-surface, highly turbulent layer, and the structure and dynamics of granulation. They reveal solar-type differential rotation and latitudinal dependence of the tachocline location.

Keywords

convectionhydrodynamicsmethods: numericalstars: generalhorizontal-branchinteriorsrotationfundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 86 - 93
Copyright
© International Astronomical Union 2020

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