Molecular Lines as Diagnostics of Solar and Stellar Magnetic Fields
Svetlana Berdyugina & Sami Solanki

Institute: University of Oulu, Finland
Institute: MPI fu"r Aeronomie, Katlenburg-Lindau, Germany
Contact Email: Sveta.Berdyugina@oulu.fi

Abstract: Thanks to recent advances in theory (Berdyugina et al. 2000, 2001) we can now calculate molecular line profiles in the presence of magnetic fields with high accuracy (Zeeman and Paschen- Back effects). The synthetic Stokes profiles of various molecular species (e.g. TiO, OH, MgH, CN, FeH) have been compared with profiles observed in sunspots. The agreement between the theory and observations is remarkable. For example, the mutually opposite polarities of different OH lines are reproduced without invoking any free parameters. Introducing molecular lines into the inversion of sunspot spectra leads to significant improvements in the deduced magnetic field vector. Here we investigate how molecular lines can be used to deduce magnetic parameters of cool stars. We find that such lines are of great interest for measuring magnetic fields on cooler stars and in starspots.

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Manuscript submitted: 2001-Sep-7
"The Future of Cool-Star Astrophysics', 2003, Eds. A. Brown, G. M. Harper, & T. R. Ayres. Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems, & The Sun,
© 2003 University of Colorado.