Hussain, G. A. J. and Collier Cameron, A. and Jardine, M. M. and Dunstone, N. and Ramirez Velez, J. and Stempels, H. C. and Donati, J.-F. and Semel, M. and Aulanier, G. and Harries, T. and Bouvier, J. and Dougados, C. and Ferreira, J. and Carter, B. D. ORCID: https://orcid.org/0000-0003-0035-8769 and Lawson, W. A.
(2009)
Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha.
Monthly Notices of the Royal Astronomical Society, 398 (1).
pp. 189-200.
ISSN 0035-8711
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Abstract
We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G- and K-type T Tauri stars in the Chamaeleon I star-forming cloud with ages of 3–5 Myr. Our magnetic field maps show evidence for strong, complex multipolar fields similar to those obtained for young rapidly rotating main-sequence stars. Brightness maps indicate the presence of dark polar caps and low-latitude spots – these brightness maps are very similar to those obtained for other pre-main-sequence and rapidly rotating main-sequence stars.
Only two other classical T Tauri stars have been studied using similar techniques so far: V2129 Oph and BP Tau. CV Cha and CR Cha show magnetic field patterns that are significantly more complex than those recovered for BP Tau, a fully convective T Tauri star.
We discuss possible reasons for this difference and suggest that the complexity of the stellar magnetic field is related to the convection zone; with more complex fields being found in T Tauri stars with radiative cores (V2129 Oph, CV Cha and CR Cha). However, it is clearly necessary to conduct magnetic field studies of T Tauri star systems, exploring a wide range of stellar parameters in order to establish how they affect magnetic field generation, and thus how these magnetic fields are likely to affect the evolution of T Tauri star systems as they approach the main sequence.
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