Volume 388, Number 3, June IV 2002
|Page(s)||868 - 888|
|Section||Interstellar and circumstellar matter|
|Published online||10 June 2002|
Doppler Imaging of stellar magnetic fields
II. Numerical experiments
Uppsala Astronomical Observatory, Box 515, 751 20 Uppsala, Sweden
Corresponding author: O. Kochukhov, email@example.com
Accepted: 27 February 2002
We present numerical experiments designed to evaluate the performance of the new Magnetic Doppler Imaging (MDI) code INVERS10. Numerous test runs demonstrate what can be achieved with the MDI method and allow assessment of the systematic errors that can cause distortions of the maps. Our numerical experiments showed that given high-resolution observations in four Stokes parameters the code is capable of reconstructing abundance and magnetic field vector distributions simultaneously and without any prior assumptions about the magnetic field geometry. At the same time we found that in order to achieve reliable reconstruction using only circular polarization data it is necessary to impose additional constraints on the possible structure of the magnetic field. Numerical tests also reveal surprisingly different properties of the MDI maps from conventional scalar maps which we attribute to the complex relation between the orientation of the field and the polarization signal. We conclude that the information about the field is primarily extracted from the changes in magnetic orientation due to rotation rather than from the Doppler shifts critical for scalar Doppler Imaging maps making it possible to apply the MDI to even very slow rotators.
Key words: stars: magnetic fields / stars: chemically peculiar / methods: Doppler Imaging
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.