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We present the first short time scale observations of the roAp star gamma Equin linear polarized light obtained with the PEPSI polarimeter installed at theLBT. These observations are used to search for pulsation variability in StokesQ and U line profiles belonging to different elements. The atmospheres of roApstars are significantly stratified with spectral lines of different elementsprobing different atmospheric depths. roAp stars with strong magnetic fields,such as gamma Equ with a magnetic field modulus of 4kG and a pulsation periodof 12.21min, are of special interest because the effect of the magnetic fieldon the structure of their atmospheres can be studied with greatest detail andaccuracy. Our results show that we may detect changes in the transversal fieldcomponent in Fe I and rare-earth lines possessing large second-order Landefactors. Such variability can be due to the impact of pulsation on thetransverse magnetic field, causing changes in the obliquity angles of themagnetic force lines. Further studies of roAp stars in linear polarized lightand subsequent detailed modelling are necessary to improve our understanding ofthe involved physics.

The rapidly oscillating Ap star gamma Equ: linear polarization as an enhanced pulsation diagnostic?