Stellar magnetism - Some observable, expected and suggested effects of magnetic field in eruptive variables

Astronomy and Astrophysics – Astronomy

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Flare Stars, Magnetic Stars, Stellar Evolution, Stellar Magnetic Fields, T Tauri Stars, Variable Stars, Magnetohydrodynamic Stability, Main Sequence Stars, Photosphere, Statistical Correlation, Ultraviolet Radiation

Scientific paper

Probable manifestations of magnetism in UV Ceti flare stars and T Tauri stars are considered. A hydromagnetic model of variability is proposed for interpreting the main features of T Tauri stars. It is concluded that: (1) T Tauri stars of spectral types F through M have strong large-scale magnetic fields and are the predecessors of main-sequence stars of spectral types A through G; (2) T Tauri activity is a manifestation of instability in magnetic inhibition of stellar brightness; and (3) UV Ceti-type flare activity is a manifestation of instability in local magnetic fields on generally stable stars and is energized, directly or indirectly, by magnetic fields.

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