CAOSP abstracts, Volume: 38, No.: 2, year: 2008

Author(s): Stift, M.J.; Leone, F.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2, p. 185-190.
Date: 4/2008
Title: Paschen is partially Back
Keyword(s): atomic processes, magnetic fields, line : profiles, stars : chemically peculiar, stars : magnetic fields
Pages: 185 -- 190

Abstract: We present a discussion of the partial Paschen-Back (PB) effect in magnetic Ap stars. An overview of the theory is illustrated with examples of how splittings deviate non-linearly from the simple Zeeman picture; normally forbidden "ghost lines" appear in strong fields. Resulting asymmetric stellar Stokes profiles for a dipolar magnetic geometry are shown for the Fe I λ 6149 line and it is established that PB lines may be subject to wavelength shifts. Modelling of Stokes profiles in the PB regime opens exciting new diagnostics.

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