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2010MNRAS.407.2269M - Mon. Not. R. Astron. Soc., 407, 2269-2286 (2010/October-1)
Large-scale magnetic topologies of late M dwarfs.
MORIN J., DONATI J.-F., PETIT P., DELFOSSE X., FORVEILLE T. and JARDINE M.M.
Abstract (from CDS):
We find two distinct categories of magnetic topologies: on the one hand strong axisymmetric dipolar fields (similar to mid M dwarfs), and on the other hand weak fields generally featuring a significant non-axisymmetric component, and sometimes a significant toroidal one. Comparison with unsigned magnetic fluxes demonstrates that the second category of magnetic fields shows less organization (less energy in the large scales), similarly to partly convective early M dwarfs. Stars in both categories have similar stellar parameters, our data do not evidence a separation between these two categories in the mass-rotation plane.
We also report marginal detection of a large-scale magnetic field on the M8 star VB10 featuring a significant toroidal axisymmetric component, whereas no field is detectable on VB8 (M7).
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): techniques: polarimetric - stars: low-mass - stars: magnetic field - stars: rotation
VizieR on-line data: <Available at CDS (J/MNRAS/407/2269): stars.dat table1.dat tables.dat>
Simbad objects: 26
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