EDP Sciences

Vol. 548
In section 8. Stellar atmospheres

The magnetic field topology of the weak-lined T Tauri star V410 Tauri. New strategies for Zeeman-Doppler imaging

by T.A. Carroll, K.G. Strassmeier, J.B. Rice, and A. Kuenstler, A&A 548, A95

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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.