Dennis edited SETTING_UP_FOR_THE_PRESENTATION__.tex  almost 9 years ago

Commit id: 3891b5120038c5ef027d193210ba8d895b16520c

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%[SETTING UP FOR THE PRESENTATION OF THE DATA OR MOVE REWORDED VERSION TO AFTER FIG1.]  However, %However,  a puzzling phenomenon arose from the observation of a few dozen %[44 ~22\%] stars %stars  showing little or no power in the dipole modes \citep{Mosser_2011,Garc_a_2014}. %[REF Mosser/Droopy]. %, [but providing   %only tentative conclusions that this phenomona probably concerns stars  %more massive than 1.3\msol for which strong coupling between envelope and  %core modes would increase the mode mass, reducing the observed amplitude.]   Recent %Recent  theoretical work has shown that the $\ell =1 $ modes suppression can be explained if waves entering the core are prevented from returning to the envelope. This occurs in the presence of strong magnetic fields, which give rise to a ``magnetic greenhouse'' effect, efficiently trapping the wave energy that tunnels into the stellar core (Fuller et al. 2015). %and provides a mechanism that can cause such an effect in the  %presence of a strong core magnetic field near the hydrogen-burning shell[ref  

%the right and the largest and most evolved stars are to the left.   For ``normal'' stars (top panels), the observed integrated power in the dipole  modes (red peaks) is typically about 50-60\% larger than for the radial  modes (black peaks) as usual in Kepler observations [ref  Ballot2011/Mosser2012LargeKepler]. \citep{Ballot_2011,Mosser_2011}.  However, at each stage of evolution we find stars with significantly suppressed dipole modes (bottom panels).  % a phenomena previously observerved in X red giants  % [refMosser2012LargeKepler] and a subgiant star [ref Droopy].   Stars with suppressed dipole modes was first observed in a few dozen stars \cite{Mosser_2011}, and we find 739 stars showing similar suppression. The cause of this suppression phenomenon has been puzzling until recent theoretical work, which shows that the suppression can be explained if waves entering the core are prevented from returning to the envelope, preventing the establishment of standing waves. This occurs in the presence of strong magnetic fields in the core, giving rise to a ``magnetic greenhouse'' effect that efficiently traps the wave energy that reach core (Fuller et al. 2015).