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Accretion onto Stars with Octupole Magnetic Fields Matter Flow, Hot Spots and Phase Shifts


, : Accretion onto Stars with Octupole Magnetic Fields Matter Flow, Hot Spots and Phase Shifts. New Astronomy 17(2): 232-245

Recent measurements of the surface magnetic fields of classical T Tauri stars (CSs) and magnetic cataclysmic variables show that their magnetic fields have a complex structure. Investigation of accretion onto such stars requires global three-dimensional (3D) magnetohydrodynamic (MHD) simulations, where the complexity of simulations strongly increases with each higher-order multipole. Previously, we were able to model disc accretion onto stars with magnetic fields described by a superposition of dipole and quadrupole moments. However, in some stars, like CS V2129 Oph and BP Tau, the octupolar component is significant and it was necessary to include the next octupolar component. Here, we. Highlights: Accretion onto stars with complex magnetic fields has been investigated in global three-dimensional simulations. The field is taken as a superposition of the dipole and octupole moments. Cases of different relative strengths of the octupole and dipole fields were investigated. New models of phase shifts based on the complexity of the field were proposed.

US$19.90

DOI: 10.1016/j.newast.2011.08.001


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