Mixing-length parameter for a sample of KIC stars Virtual Observatory Resource

Authors
  1. Viani L.S.
  2. Basu S.
  3. J.O. J M
  4. Bonaca A.
  5. Chaplin W.J.
  6. Published by
    CDS
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, {alpha}, used is the solar-calibrated value, many studies have shown that other values of {alpha} 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 {alpha} required and the properties of the star is then investigated. For Eddington atmosphere, non-diffusion models, we find that the value of {alpha} can be approximated by a linear model, in the form of {alpha}/{alpha}_{sun}_=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.

Keywords
  1. metallicity
  2. astronomical-models
Bibliographic source Bibcode
2018ApJ...858...28V
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/858/28
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/858/28
Document Object Identifer DOI
doi:10.26093/cds/vizier.18580028

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/858/28
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/858/28
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/858/28
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https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/858/28/table3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/858/28/table3?

History

2019-04-25T14:17:11Z
Resource record created
2019-04-25T14:17:11Z
Created
2019-05-06T15:49:03Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr