In section 8. Stellar atmospheres
The magnetic field topology of the weak-lined T Tauri star V410 Tauri. New strategies for Zeeman-Doppler imaging
The authors use a new line profile reconstruction technique based on a singular value decomposition and their Zeeman-Doppler imaging code to study the magnetic field of the weak-lined T Tauri star V410 Tau. The derived magnetic field structure is well correlated with the surface temperature and is dominated by a strong field (almost 2 kG) within the cool polar spot and smaller fields down to lower latitudes. The Zeeman-Doppler maps exhibit a large-scale organization of both polarities around the polar cap in the form of a twisted bipolar structure. The nonaxisymmetric field structure and the lack of differential rotation for V410 Tau support the idea of an underlying alpha^2-type dynamo, which is predicted for weak-lined T Tauri stars.