A search for magnetic fields in the T Tauri stars GW Ori, CoD-34 7151, and RU Lup

Astronomy and Astrophysics – Astronomy

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Polarimetry, Stellar Magnetic Fields, Stellar Spectrophotometry, T Tauri Stars, High Resolution, Magnetic Flux, Magnetohydrodynamic Waves, Spectral Resolution, Spectrum Analysis, Statistical Analysis, Stellar Winds, Zeeman Effect

Scientific paper

The authors present new high resolution circular spectropolarimetry, taken with the RGO Spectrograph and Pockel's Cell Polarimeter at the AAT, of the T Tauri stars GW Ori, CoD -34°7151, and RU Lupi. These spectra have been subjected to a statistical Zeeman analysis and a 2.3 sigma result for an effective longitudinal magnetic field of -548 Gauss is found in RU Lupi. This field strength is close to that predicted from a model of the wind driving mechanism for this star developed by Lago in which momentum is imparted to the wind by Alfvén waves propagating through a large-scale magnetic field. Three sigma upper limits of 1110 G and 2022 G are set for the strength of the effective longitudinal magnetic field in the stars GW Ori and CoD -34°7151 respectively.

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