VizieR Online Data Catalog: Mixing-length parameter for a sample of KIC stars (Viani+, 2018)
Abstract
Stellar models typically use the mixing-length approximation as a way to implement convection in a simplified manner. While conventionally the value of the mixing-length parameter, α, used is the solar-calibrated value, many studies have shown that other values of α are needed to properly model stars. This uncertainty in the value of the mixing-length parameter is a major source of error in stellar models and isochrones. Using asteroseismic data, we determine the value of the mixing-length parameter required to properly model a set of about 450 stars ranging in logg, Teff, and [Fe/H]. The relationship between the value of α required and the properties of the star is then investigated. For Eddington atmosphere, non-diffusion models, we find that the value of α can be approximated by a linear model, in the form of α/αȯ=5.426-0.101, log(g)-1.071, log(Teff)+0.437([Fe/H]). This process is repeated using a variety of model physics, as well as compared with previous studies and results from 3D convective simulations.
(1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- March 2019
- DOI:
- 10.26093/cds/vizier.18580028
- Bibcode:
- 2019yCat..18580028V
- Keywords:
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- Abundances: [Fe/H];
- Models