A view into the core of α Cen A

A view into the core of α Cen A

We present results of modelling of α Cen A. In order to estimate the physical parameters of this star, we modelled spectroscopic, interferometric, astrometric and asteroseismic data. To that effect we chose to use a Bayesian approach to parameter estimation, which allowed us, in particular, to defin...

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Main Authors: Bazot Michaël, Christensen-Dalsgaard Jørgen, Benomar Othman, Gizon Laurent
Format: Article
Language:English
Published: EDP Sciences 2017-01-01
Series:EPJ Web of Conferences
Online Access:https://doi.org/10.1051/epjconf/201716003006
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spelling doaj-ded037056b5d4a5e88d3dba94057aa7d2021-08-02T09:43:40ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011600300610.1051/epjconf/201716003006epjconf_azores2017_03006A view into the core of α Cen ABazot MichaëlChristensen-Dalsgaard JørgenBenomar OthmanGizon LaurentWe present results of modelling of α Cen A. In order to estimate the physical parameters of this star, we modelled spectroscopic, interferometric, astrometric and asteroseismic data. To that effect we chose to use a Bayesian approach to parameter estimation, which allowed us, in particular, to define our prior knowledge on the parameters. An important question we wanted to address was to assess whether or not α Cen A has a convective core. We found that the data we used give indecisive results on this issue. If the star has a convective core, and provided that overshooting is taken into account, there is a possibility for the star to be in the peculiar state in which the ppII chain is the main driver of nuclear energy generation. We also found a non-negligible probability for α Cen A to be a very early subgiant.https://doi.org/10.1051/epjconf/201716003006
collection DOAJ
language English
format Article
sources DOAJ
author Bazot Michaël
Christensen-Dalsgaard Jørgen
Benomar Othman
Gizon Laurent
spellingShingle Bazot Michaël
Christensen-Dalsgaard Jørgen
Benomar Othman
Gizon Laurent
A view into the core of α Cen A
EPJ Web of Conferences
author_facet Bazot Michaël
Christensen-Dalsgaard Jørgen
Benomar Othman
Gizon Laurent
author_sort Bazot Michaël
title A view into the core of α Cen A
title_short A view into the core of α Cen A
title_full A view into the core of α Cen A
title_fullStr A view into the core of α Cen A
title_full_unstemmed A view into the core of α Cen A
title_sort view into the core of α cen a
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2017-01-01
description We present results of modelling of α Cen A. In order to estimate the physical parameters of this star, we modelled spectroscopic, interferometric, astrometric and asteroseismic data. To that effect we chose to use a Bayesian approach to parameter estimation, which allowed us, in particular, to define our prior knowledge on the parameters. An important question we wanted to address was to assess whether or not α Cen A has a convective core. We found that the data we used give indecisive results on this issue. If the star has a convective core, and provided that overshooting is taken into account, there is a possibility for the star to be in the peculiar state in which the ppII chain is the main driver of nuclear energy generation. We also found a non-negligible probability for α Cen A to be a very early subgiant.
url https://doi.org/10.1051/epjconf/201716003006
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AT gizonlaurent aviewintothecoreofacena
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AT christensendalsgaardjørgen viewintothecoreofacena
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