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Matteo Cantiello edited Abstract.tex
over 8 years ago
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Internal stellar magnetic fields are inaccessible to direct observations
and little is known about their amplitude, geometry and evolution. We
demonstrate that strong magnetic fields in the cores of red giant stars
can be identified with asteroseismology.
{\bf The fields can
manifest themselves via depressed dipole stellar oscillation modes,
which arises from a magnetic greenhouse effect that scatters and traps
oscillation mode energy within the core of the
star.} star. The \emph{Kepler}
satellite has observed
{\bf a few
dozen} dozen red giants with
{\bf depressed} depressed dipole modes which we interpret as stars with
strongly magnetized cores. We find field strengths larger than
$\sim \! $\sim\! 10^5 \,{\rm G}$
{\bf may
produce} produce the observed
depression, and in one case
{\bf we infer a minimum core field
strength of $\approx \! \! 10^7 \,{\rm
G}$}. G}$.