Observation of the Molecular Zeeman Effect in the G band

Details Observation of the Molecular Zeeman Effect in the G band Observation of the Molecular Zeeman Effect in the G band

2004-07-16

arxiv.org/abs/astro-ph/0407332v1

Astrophys.J. 611 (2004) L61-L64

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/423617

Here we report on the first observational investigation of the Zeeman effect in the G band around 4305 A. Our spectropolarimetric observations of sunspots with the Zurich Imaging Polarimeter at the IRSOL facility confirm our previous theoretical prediction that the molecular Zeeman effect produces measurable circular polarization signatures in several CH lines that are not overlapped with atomic transitions. We also find both circular and linear polarization signals produced by atomic lines whose wavelengths lie in the G band spectral region. Together, such molecular and atomic lines are potentially important for empirical investigations on solar and stellar magnetism. For instance, a comparison between observed and calculated Stokes profiles suggests that the thermodynamical and/or magnetic properties of the photospheric regions of sunspot umbrae are horizontally structured with a component that might be associated with umbral dots.

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