Can we predict the magnetic properties of PMS stars from their H-R diagram location?

S. G. Gregory (1) , J. -F. Donati (2) , Julien Morin (3, 4) , G. A. J. Hussain (5) , N. J. Mayne (6) , L. A. Hillenbrand (7) , M. Jardine (1)

1 University of St Andrews [Scotland]
2 IRAP - Institut de recherche en astrophysique et planétologie
3 LUPM - Laboratoire Univers et Particules de Montpellier
4 Institut für Astrophysik [Göttingen]
5 ESO Garching
6 University of Exeter
7 CALTECH - California Institute of Technology

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.

Domaines: Astrophysique stellaire et solaire [astro-ph.SR]

S. G. Gregory, J. -F. Donati, Julien Morin, G. A. J. Hussain, N. J. Mayne, et al.. Can we predict the magnetic properties of PMS stars from their H-R diagram location?. IAUS 302: Magnetic Fields throughout Stellar Evolution, Aug 2013, Biarritz, France. pp.40, ⟨10.1017/S1743921314001677⟩. ⟨hal-01770047⟩