Spectropolarimetric observations combined with tomographic imaging techniques have revealed that all pre-main sequence (PMS) stars host multipolar magnetic fields, ranging from strong and globally axisymmetric with >~kilo-Gauss dipole components, to complex and non-axisymmetric with weak dipole components (<~0.1 kG). Many host dominantly octupolar large-scale fields. We argue that the large-scale magnetic properties of a PMS star are related to its location in the Hertzsprung-Russell diagram. This conference paper is a synopsis of Gregory et al. (2012), updated to include the latest results from magnetic mapping studies of PMS stars....
|Title of host publication||Proceedings of the International Astronomical Union|
|Subtitle of host publication||Magnetic Fields throughout Stellar Evolution|
|Editors||Pascal Petit, Moira Jardine, Hendrik Spruit|
|Publisher||Cambridge University Press|
|Publication status||Published - Aug 2014|