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 - Funding Information:
This material is based upon work supported by the NYU Abu Dhabi Institute under grant G1502. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant DNRF106).
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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U2 - 10.1051/epjconf/201716003006
DO - 10.1051/epjconf/201716003006
M3 - Conference article
AN - SCOPUS:85033476886
SN - 2101-6275
VL - 160
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 -