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Pulsations in hot subdwarf stars: recent advances and prospects for testing stellar physics

Published online by Cambridge University Press:  27 October 2016

Stéphane Charpinet ,
V. Van Grootel ,
G. Fontaine ,
P. Brassard ,
S.K. Randall  and
E. M. Green
Stéphane Charpinet
Affiliation:
CNRS, UPS-OMP, Université de Toulouse, Toulouse, France email: stephane.charpinet@irap.omp.eu
V. Van Grootel
Affiliation:
Institut d'Astrophysique et de Géophysique, Université de Liège, Liège, Belgium
G. Fontaine
Affiliation:
Département de Physique, Université de Montréal, Montréal, Canada
P. Brassard
Affiliation:
Département de Physique, Université de Montréal, Montréal, Canada
S.K. Randall
Affiliation:
ESO, Garching bei München, Germany
E. M. Green
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ, USA
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Abstract

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The evolved, core helium burning, extreme horizontal branch stars (also known as hot B subdwarfs) host several classes of pulsators showing either p- or g-modes, or both. They offer particularly favorable conditions for probing with asteroseismology their internal structure, thus constituting arguably the most interesting seismic window for this intermediate stage of stellar evolution. G-modes in particular have the power to probe deep inside these stars, down to the convective He-burning core boundary where uncertain physics (convection, overshooting, semi-convection) is at work. Space data recently obtained with CoRoT and Kepler are offering us the possibility to probe these regions in detail and possibly shed new light on how these processes shape the core structure. In this short paper, we present the most recent advances that have taken place in this field and we provide hints of the foreseen future achievements of hot subdwarf asteroseismology.

Keywords

stars : oscillationssubdwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 581 - 588
Copyright
Copyright © International Astronomical Union 2016 

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