First polarimetric measurements and modeling of the Paschen-Back effect in CaH transitions

Details First polarimetric measurements and modeling of the Paschen-Back effect in CaH transitions First polarimetric measurements and modeling of the Paschen-Back effect in CaH transitions

2006-10-19

arxiv.org/abs/astro-ph/0610588v1

Astrophys.J.649:L49-L52,2006

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/508159

We report the first spectropolarimetric observations and modeling of CaH transitions in sunspots. We have detected strong polarization signals in many CaH lines from the A-X system, and we provide the first successful fit to the observed Stokes profiles using the previously developed theory of the Paschen-Back effect in arbitrary electronic states of diatomic molecules and polarized radiative transfer in molecular lines in stellar atmospheres. We analyze the CaH Stokes profiles together with quasi-simultaneous observations in TiO bands and conclude that CaH provides a valuable diagnostic of magnetic fields in sunspots, starspots, cool stars, and brown dwarfs.

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