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Magnetism and Activity of the Sun and Stars
J. Arnaud and N. Meunier (eds)
EAS Publications Series, Vol. 9, 2003

DOI: 10.1051/eas:2003092

Measuring transverse magnetic fields: the influence of a polarized continuum

J.-L. Leroy

Observatoire Midi-Pyrénées, 14 Av. Belin, 31400 Toulouse, France


Abstract
The diagnosis of stellar magnetic fields must include the determination of the transverse field component, thus the measurement of linear polarization across spectral lines. While the neighbouring continuum is often considered as a zero reference level, it can be polarized by various scattering mechanisms. I discuss some consequences of such a superposition.



© EAS, EDP Sciences 2003