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  Bayesian inference of stellar parameters based on 1D stellar models coupled with 3D envelopes

Jørgensen, A. C. S., & Angelou, G. C. (2019). Bayesian inference of stellar parameters based on 1D stellar models coupled with 3D envelopes. Monthly Notices of the Royal Astronomical Society, 490(2), 2890-2904. doi:10.1093/mnras/stz2825.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-57D5-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-57D6-8
Genre: Journal Article

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Jørgensen, Andreas Christ Sølvsten1, Author              
Angelou, George C.2, Author              
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              
2Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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 Abstract: Stellar models utilizing 1D, heuristic theories of convection fail to adequately describe the energy transport in superadiabatic layers. The improper modelling leads to well-known discrepancies between observed and predicted oscillation frequencies for stars with convective envelopes. Recently, 3D hydrodynamic simulations of stellar envelopes have been shown to facilitate a realistic depiction of superadiabatic convection in 1D stellar models. The resulting structural changes of the boundary layers have been demonstrated to impact not only the predicted oscillation spectra but evolution tracks as well. In this paper, we quantify the consequences that the change in boundary conditions has for stellar parameter estimates of main-sequence stars. For this purpose, we investigate two benchmark stars, Alpha Centauri A and B, using Bayesian inference. We show that the improved treatment of turbulent convection makes the obtained 1D stellar structures nearly insensitive to the mixing length parameter. By using 3D simulations in 1D stellar models, we hence overcome the degeneracy between the mixing length parameter and other stellar parameters. By lifting this degeneracy, the inclusion of 3D simulations has the potential to yield more robust parameter estimates. In this way, a more realistic depiction of superadiabatic convection has important implications for any field that relies on stellar models, including the study of the chemical evolution of the Milky Way Galaxy and exoplanet research.

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 Dates: 2019-10-10
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2825
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 490 (2) Sequence Number: - Start / End Page: 2890 - 2904 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150