CAOSP abstracts, Volume: 48, No.: 1, year: 2018

Abstract: The magnetic chemically peculiar (mCP) stars of the upper main sequence exhibit strong and globally organized magnetic fields that are inclined to the rotational axis and facilitate the development of surface abundance inhomogeneities resulting in photometric and spectroscopic variability. Photometric time series data are much easier to obtain than spectroscopic/polarimetric data or are available from large surveys, thus the number of known rotational periods increased significantly during the last years. Furthermore, Gaia data allow us to place an unprecedentedly large sample of mCP stars in the Hertzsprung-Russell diagram and to investigate evolutionary effects. In this paper we review the rotational properties of mCP stars and discuss open issues of stellar rotation in the presence of strong magnetic fields.