Abstract Title: * Magnetic field variability in RZ Ari - an evolved M giant Authors: * R. Konstantinova-Antova, A.Lebre, M. Auriere, S.Tsvetkova, R.Bogdanovski, A. Borisova, P. Mathias, B. Thessore Institution: * Institute of Astronomy and NAO, Bulgarian Academy of Sciences Preferred format: * Oral Abstract Text: * RZ Ari is a fast rotating apparently single M giant of 2.2 Msun. It is fairly evolved to tip RGB or early AGB stage. We have studied its longitudinal magnetic field variability using data obtained with the spectropolarimeter Narval at TBL, France in the period 2008-2018. A period of 1230 d was revealed. The reason for this periodicity is discussed in the context of rotational modulation or stellar pulsations.