Zeeman tomography of magnetic white dwarfs: General method and application to EF Eridani

Details Zeeman tomography of magnetic white dwarfs: General method and application to EF Eridani Zeeman tomography of magnetic white dwarfs: General method and application to EF Eridani

2003-03-14

arxiv.org/abs/astro-ph/0303336v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to appear in 'White Dwarfs', proceedings of the 13th European workshop on White Dwarfs, eds. D. de Martino

Scientific paper

We have developed a new method to derive the magnetic field distribution on the surfaces of rotating magnetic white dwarfs from phase-resolved flux and circular polarization spectra. An optimization code based on an evolutionary strategy is used to fit synthetic Zeeman spectra for a variety of model geometries described in the framework of a truncated multipole expansion. We demonstrate that the code allows the reconstruction of relatively complex fields using noise-added synthetic input spectra. As a first application, we analyze flux and circular polarization spectra of the polar EF Eri in a low state of accretion taken with FORS1 at the ESO VLT.

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