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\section{Introduction}  %A fraction of main-sequence A stars shows strong surface magnetic fields (Ap stars).  %Ap stars have large scale, predominantly dipolar magnetic fields that show little or no time evolution and %amplitudes in the range 0.3-30kG.   Surface Stellar  magnetic fields are routinely measured in stars. However observed through  their internal magnetic properties are inaccessible to direct observations; as a consequence very little is known about Zeeman spectroscopic signature.  Magnetic flux can be inherited from  the amplitude, geometry and evolution of internal stellar B-fields.  %A gas cloud from which the star is formed or can be generated by a dynamo.  A  fraction of main-sequence about 5-10\% of main sequence  A stars showsstrong surface magnetic fields (Ap stars).  %Ap stars have  large scale, predominantly dipolar magnetic fields that show little or no time evolution and %amplitudes amplitudes  in the range 0.3-30kG. Here we demonstrate that a strong Whether the observed  magnetic field in is inherited from  the core of RGB stars can suppress the amplitude formation process or generated by a contemporary dynamo,  A fraction  of dipolar oscillation modes. Suppressed dipolar modes Stars  are indeed observed in about 10\% spheres  of ascending RGB stars, and we identify these as stars with strongly magnetized cores. hot plasma.  The observed fraction and mass distribution of these stars suggests that they could be Observations have revealed  the descendants presence  of surface  magnetic Ap stars. The novel asteroseismic technique described here allows to constrain for fields through their Zeeman spectroscopic signature.  From  the first time moment of formation to their death, stars undergo turbulent phenomena that can stir their ionized gas and turn kinetic energy into magnetic energy. Such process is call a dynamo and  the magnetic field is said to be dynamo-generated.  by turbulent phenomena,  in particular convection and differential rotation.   magnetized spheres of plasma  The study of stellar magnetism is limited to surface measurements, with  the deep interiors of a large population of stars. stars  tellar magnetism is   Magnetic fields unobserved in the interiors. Red giant asteroseismology. Depressed dipoles mistery.  \begin{itemize}