deletions | additions       diff --git a/Abstract.tex b/Abstract.tex  index b943086..31a66ab 100644  --- a/Abstract.tex  +++ b/Abstract.tex 
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%Internal stellar magnetic fields are inaccessible to direct observations and little is known about their amplitude, geometry and evolution. Here, we demonstrate that strong magnetic fields in the cores of red giant stars can suppress dipole oscillation modes. The suppression arises from a magnetic greenhouse effect causing oscillation mode energy to be trapped within the core. Suppressed dipole modes are indeed observed in roughly $20 \%$ of young red giants, and we interpret these as stars with magnetized cores. We place lower limits on the core field strengths, which indicate these stars have retained fossil fields or hosted a core dynamo during the main sequence. The novel technique reported here allows for constraints on magnetic fields in the deep interiors of large populations of stars.  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 suppress dipole oscillation modes. The suppression arises from a magnetic greenhouse effect causing oscillation mode energy to be trapped within the core. Suppressed dipole modes are indeed observed in a substantial fraction of \textit{Kepler} young red giants, and we interpret these as stars with magnetized cores. We place lower limits on and in one case measure the value of  the core field strengths, which indicate these stars have retained fossil fields or hosted a core dynamo during the main sequence.We measure the internal magnetic field for the subgiant star KIC8561221.  This technique allows to constrains put constraints on  internal magnetic fields in large populations of stars.