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Inferring properties of small convective cores in main-sequence solar-like pulsators

Published online by Cambridge University Press:  19 December 2013

I.M. Brandão ,
M.S. Cunha  and
J. Christensen-Dalsgaard
I.M. Brandão
Affiliation:
Centro de Astrofísica and Faculdade de Ciências, Universidade do Porto, Portugal, Rua das Estrelas, 4150-762 Porto, Portugal
M.S. Cunha
Affiliation:
Centro de Astrofísica and Faculdade de Ciências, Universidade do Porto, Portugal, Rua das Estrelas, 4150-762 Porto, Portugal
J. Christensen-Dalsgaard
Affiliation:
Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Abstract

This work concerns the study of the properties of convective cores in main-sequence models of solar-like pulsators and what information they may hold about stellar ages. We verified that the maximum absolute frequency derivative of particular combinations of frequencies, which we name “the slopes”, provides information on the relative size of the discontinuity in the sound-speed profile at the border of the convectively mixed region. Since the latter is related to the evolutionary state of stars, we show that for models with masses above 1.3M⊙, it may be possible to estimate the fraction of stellar main-sequence evolution from the slopes. Moreover, for models with masses below 1.2M⊙ we verified that it may be possible to use the slopes to discriminate against models with small amounts of core overshoot.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 115 - 121
Copyright
© EAS, EDP Sciences, 2013

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References

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