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24 April 2024 |
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Article overview
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Zeeman tomography of magnetic white dwarfs: General method and application to EF Eridani | | F. Euchner
; K. Beuermann
; K. Reinsch
; S. Jordan
; F. V. Hessman
; B. T. Gaensicke
; | | Date: |
14 Mar 2003 | | Subject: | astro-ph | | Affiliation: | 1 and 2), F. V. Hessman , B. T. Gaensicke ( University Observatory, Goettingen, Germany, Institut fuer Astronomie u. Astrophysik, Tuebingen, Germany, Dept. of Physics and Astronomy, Univ. of Southampton, UK | | Abstract: | 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. | | Source: | arXiv, astro-ph/0303336 | | Services: | Forum | Review | PDF | Favorites | |
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