A view into the core of α Cen A

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

Research output: Contribution to journalConference article

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 languageEnglish (US)
Article number03006
JournalEPJ Web of Conferences
Volume160
DOIs
StatePublished - Oct 27 2017
EventSeismology 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 2016Jul 25 2016

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stars
nuclear energy
estimates

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

A view into the core of α Cen A. / Bazot, Michael; Christensen-Dalsgaard, Jørgen; Benomar, Othman; Gizon, Laurent.

In: EPJ Web of Conferences, Vol. 160, 03006, 27.10.2017.

Research output: Contribution to journalConference article

Bazot, Michael ; Christensen-Dalsgaard, Jørgen ; Benomar, Othman ; Gizon, Laurent. / A view into the core of α Cen A. In: EPJ Web of Conferences. 2017 ; Vol. 160.
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