Volume 385, Number 2, April II 2002
|Page(s)||701 - 715|
|Published online||15 April 2002|
The molecular Zeeman effect and diagnostics of solar and stellar magnetic fields
I. Theoretical spectral patterns in the Zeeman regime
Astronomy Division, University of Oulu, PO Box 3000, 90401 Oulu, Finland
2 Max-Planck-Institut für Aeronomie, 37191 Katlenburg-Lindau, Germany
Corresponding author: S. V. Berdyugina, Sveta.Berdyugina@oulu.fi
Accepted: 21 January 2002
An overview of the theory of the Zeeman effect in diatomic molecules for the limiting Hund's cases (a) and (b) is given and a numerical approach for the intermediate coupling case (a–b) is developed. In contrast to earlier derivations, which were limited to doublets, this approach is valid for terms of any multiplicity. General properties of the Zeeman effect for the various cases are deduced. Finally, calculated Landé factors for prominent molecular bands in sunspot and cool-star spectra are employed to predict the general behaviour of these bands in the presence of a magnetic field below the Paschen-Back limit. The limiting field strength is calculated and listed.
Key words: molecular processes / Sun: magnetic fields / stars: magnetic fields / techniques: polarimetric
© ESO, 2002
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