In search for buried magnetic fields inside intermediate-mass stars along their evolution.

From the flat rotation profile inside main-sequence stars to the unexpected low rotation rate of the core of evolved red-giant stars, the extraction of stellar angular momentum is poorly understood inside intermediate-mass stars throughout their evolution. In addition, the recent discovery of red giants more massive than 1.3 solar masses that present a surprisingly low amplitude oscillation modes could be the signature of a strong magnetic field trapped inside the radiative interior of intermediate mass stars. Such strong internal magnetism might be the key mechanism for the understanding of angular momentum transport inside stars along their evolution. The only window to look for it is asteroseismology. In this FWO project, we theoretically investigate the effect of realistic stable and unstable magnetic-field configurations on the oscillation frequencies of intermediate-mass stars along their evolution, in order to predict the expected signature of such fields on asteroseismic data. We will use this newly constructed library for the first well-constrained and optimised search of internal magnetic fields inside intermediate-mass stars from the main-sequence and to the red giant stage. The measurement of internal magnetic-field amplitudes will be ground breaking for the understanding of stellar internal dynamics all along the evolution.