A view into the core of α Cen A

Michaël Bazot; Jørgen Christensen-Dalsgaard; Othman Benomar; Laurent Gizon

doi:10.1051/epjconf/201716003006

A view into the core of α Cen A

Michaël Bazot, Jørgen Christensen-Dalsgaard, Othman Benomar, Laurent Gizon

Center for Space Science

Research output: Contribution to journal › Conference article › peer-review

Abstract

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.

Original language	English (US)
Article number	03006
Journal	EPJ Web of Conferences
Volume	160
DOIs	https://doi.org/10.1051/epjconf/201716003006
State	Published - Oct 27 2017
Event	Seismology of the Sun and the Distant Stars 2016 - Using Today's Successes to Prepare the Future - TASC2 and KASC9 Workshop - SPACEINN and HELAS8 Conference - Terceira, Acores Islands, Portugal Duration: Jul 11 2016 → Jul 25 2016

ASJC Scopus subject areas

General Physics and Astronomy

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title = "A view into the core of α Cen A",

abstract = "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.",

author = "Micha{\"e}l Bazot and J{\o}rgen Christensen-Dalsgaard and Othman Benomar and Laurent Gizon",

note = "Publisher Copyright: {\textcopyright} Owned by the authors, published by EDP Sciences, 2017.; Seismology of the Sun and the Distant Stars 2016 - Using Today's Successes to Prepare the Future - TASC2 and KASC9 Workshop - SPACEINN and HELAS8 Conference ; Conference date: 11-07-2016 Through 25-07-2016",

year = "2017",

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doi = "10.1051/epjconf/201716003006",

language = "English (US)",

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TY - JOUR

T1 - A view into the core of α Cen A

AU - Bazot, Michaël

AU - Christensen-Dalsgaard, Jørgen

AU - Benomar, Othman

AU - Gizon, Laurent

N1 - Publisher Copyright: © Owned by the authors, published by EDP Sciences, 2017.

PY - 2017/10/27

Y1 - 2017/10/27

N2 - 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.

AB - 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.

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DO - 10.1051/epjconf/201716003006

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JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

M1 - 03006

T2 - Seismology of the Sun and the Distant Stars 2016 - Using Today's Successes to Prepare the Future - TASC2 and KASC9 Workshop - SPACEINN and HELAS8 Conference

Y2 - 11 July 2016 through 25 July 2016

ER -

A view into the core of α Cen A

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