Intrinsic polarization changes and the H-alpha and CA II emission features in T-Tauri stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Calcium, Emission Spectra, H Alpha Line, Polarization Characteristics, Taurus Constellation, Variable Stars, Flare Stars, Line Spectra, Magnetic Flux, Silicates, Stellar Magnetic Fields, Ultraviolet Spectra, X Ray Spectra

Scientific paper

On the basis of the correlation between polarization and emission features observed in certain T-Tauri stars, it is concluded that flaring effects associated with UV and/or X-ray irradiation and with increased magnetic field are responsible for the intrinsic polarization changes in T-Tauri stars. The correlation between emission Ca II lines and polarization degree both in Miras and T-Tau stars is thought to support the contention that the intrinsic polarization changes are due to the irradiation of silicate-like grains. In some T-Tau stars the increase in the magnetic field can be the principal agent causing the polarization increase due to the enhanced orientation of elongated grains.

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