Force-free stellar magnetospheres

Astronomy and Astrophysics – Astronomy

Scientific paper

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A Stars, Force-Free Magnetic Fields, Stellar Atmospheres, Stellar Magnetospheres, Atmospheric Models, Dipole Moments, Magnetohydrodynamic Stability, Power Spectra, Stream Functions (Fluids), Toroidal Plasmas

Scientific paper

A series of force-free axially-symmetric magnetospheric models is constructed using a power law to represent the relation between the toroidal magnetic field and the poloidal magnetic 'stream function'. It is found that when the toroidal field exceeds a certain critical intensity (depending on the power index) no continuous, physically plausible models exist. Reasons are given why the existence of a toroidal field in the magnetosphere may help to prevent the accretion of interstellar matter and thus assist the formation of 'peculiar' spectral lines.

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