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Asteroseismology can provide information that is otherwise not easilyaccessible, like the stellar mass and the evolutionary stage. Strong magneticfields are usually accompanied by rapid rotation, which makes asteroseismologydifficult due to spectral line broadening. We have found what may turn out tobe the Rosetta Stone of the stars: A slowly rotating solar-like star with astrong magnetic field. We have recently detected solar-like oscillations inthis active sub-giant, but with amplitudes much lower than expected. We suggestthat the large-scale magnetic field alters the pulsations, which becomemagneto-acoustic in nature. Here we present our results and discuss possibleimplications and how this may open up a new frontier in the studies of magneticfields and stellar evolution.

Oscillations and magnetic fields in the G8 star EK Eridani