Affiliation
Université de Toulouse; UPS-OMP; Toulouse, France and CNRS; IRAP; 14, av. Belin, F-31400 Toulouse
Main category
Natural Sciences (Astrophysics and Astrononmy)
Abstract
The spectrum of gravito-acoustic modes is depleted in dipolar modes
for a significant fraction of the giant stars observed by Kepler, a
feature that can be explained by the presence of magnetic fields in
the core of these stars (Fuller et al. 2015, Cantiello et al. 2016).
We further investigate this scenario by considering first the
oscillation spectrum of the core of a giant star modeled by a stably
stratified, self-gravitating fluid sphere pervaded by a uniform and/or
toroidal magnetic field. First results show a great sensitivity of the
g-mode spectrum to the strength of the magnetic field. This result leads
us to further investigate the possibility of using the observed spectra
to determine the dissipative properties of the core and the strength of
the magnetic field when modeled by a simple large-scale distribution
(i.e. uniform and/or toroidal). Results of these investigations will
be presented.
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