Modelling stellar surface magnetic fields. I - Search strategies and uniqueness

Details Modelling stellar surface magnetic fields. I - Search strategies and uniqueness Modelling stellar surface magnetic fields. I - Search strategies and uniqueness

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..139s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 139-146.

Statistics

Computation

6

Magnetic Stars, Stellar Magnetic Fields, Stellar Models, Computational Fluid Dynamics, Line Spectra, Stellar Magnetospheres

Scientific paper

Within the framework of the Rigid Rotator hypothesis, an elaborate procedure for the modeling of stellar magnetic surface fields aimed at ensuring the uniqueness of the final models by means of appropriate search strategies is proposed. Two different field geometries are considered for this purpose. Using a sufficiently dense grid, the entire 6D or 4D parameter space for those models that best predict the observed integrated longitudinal field and integrated scalar field strength is explored. In a second step, detailed calculations of Stokes profiles for a few selected transitions make it possible to pick out the most promising starting models for the final iterative line profile modeling procedure, often leading simultaneously to the resolution of the ambiguity between obliquity angle and inclination in axisymmetric models. Illustrating the method with the analysis of the magnetic variations of four well-observed Ap stars it is shown that the starting models derived are in reasonable agreement with the published spectra.

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