Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312402b&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #124.02; Bulletin of the American Astronomical Society, Vol. 31, p.668
Astronomy and Astrophysics
Astronomy
Scientific paper
The study of hydrogen lines in polarized light is a powerful tool for the detection and the study of stellar magnetic fields. In the case of fast rotating stars it is even the only method (Landstreet, 1982, ApJ, 258, 639). However, some discrepancies are observed between the values of the field deduced from such observations and those obtained from the observation of the polarization in metal lintes (Mathys, 1989, Fundam. Cosmic. Phys., 13, 143). In order to explain these discrepancies, we used the formalism for the formation of hydrogen lines in magnetized plasmas we had developed (Brillant et al., 1998, A&A, 339, 286), to compute synthetic line profiles in all the four Stokes parameters for a typical magnetic Ap star model. We present here the preliminary conclusions of the application of this method for the diagnosis of stellar magnetic fields.
Brillant Stéphane
Lanz Thierry
Mathys Gautier
Stehl S.
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