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Magnetic, chemically peculiar stars are known for exhibiting surfaceabundance inhomogeneities (chemical spots) that lead to photometric andspectroscopic variability with the rotation period. It is commonly assumed thatthe surface structures are causally connected with the global magnetic fieldthat dominates the photospheric and subphotospheric layers of these stars. As arule, the observed magnetic fields show a simple dipole-like geometry, with themagnetic axis being noncollinear to the rotational one. The present study aimsat detecting underlying patterns in the distribution of photometric spots in asample of 650 magnetic, chemically peculiar stars and examines their link tothe magnetic field topology. Photometric time-series observations from theASAS-3 archive were employed to inspect the light-curve morphology of oursample stars and divide them into representative classes described using aprincipal component analysis. Theoretical light curves were derived fromnumerous simulations assuming different spot parameters and following thesymmetry of a simple dipole magnetic field. These were subsequently comparedwith the observed light curves. The results from our simulations are incontradiction with the observations and predict a much higher percentage ofdoublewave light curves than is actually observed. We thereby conclude that thedistribution of the chemical spots does not follow the magnetic field topology,which indicates that the role of the magnetic field in the creation andmaintenance of the surface structures may be more subsidiary than what ispredicted by theoretical studies.

astronomy and astrophysics

Global properties of the light curves of magnetic, chemically peculiar  stars as a testbed for the existence of dipole-like symmetry in surface  structures