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| Paper: |
Multi-Line Spectro-Polarimetry of Stellar Magnetic Fields Using Principal Components Analysis |
| Volume: |
358, Solar Polarization 4 |
| Page: |
355 |
| Authors: |
Semel, M.; Rees, D.E.; Ramirez Velez, J.C.; Stift, M.J.; Leone, F. |
| Abstract: |
Zeeman-Doppler-Imaging (ZDI) is a technique for the diagnosis of stellar magnetic fields from observations of circularly polarized light, based on the weak-field approximation. This approach has proved adequate in numerous studies of the magnetic fields of solar-type stars. To improve the signal-tonoise ratio, one can add the contributions of different lines to the polarization signature. However, this multi-line extension has been limited by a number of assumptions (e.g., the weak-field approximation). Here we present a novel approach. We created a database of synthetic polarized spectra for different combinations of magnetic-field intensities and orientations. Principal Components Analysis was used to compress the database, so that only few Principal Components are needed to represent all the calculated spectra. |
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