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Doppler Imaging of Close Binaries

Published online by Cambridge University Press:  12 July 2007

Klaus G. Strassmeier
Klaus G. Strassmeier*
Affiliation:
Astrophysical Institute Potsdam (AIP), Potsdam, Germany email: [email protected]
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Abstract

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Many of the interesting spotted stars are in close binaries where one can find almost any rotational period due to the rotational synchronization with the orbital motion. Binaries are thus good laboratories to study the impact of particular astrophysical parameters that nature usually does not make easily observable. On rapidly-rotating stars, we can indirectly resolve the surface by tomographic imaging techniques and map the surface temperature distribution as a proxy of the (predominantly radial) magnetic field. Binaries are not as straightforward to map as single stars and I will show some examples where it was successful and some where it failed. Eclipses may give some clues on the amount of unresolved features in the images. I present one case of a bright giant of 100L⊙ in a close binary with even a deformed surface geometry but otherwise solar-type behavior. One of the basic goals is to learn about the impact of inter-binary magnetic fields on the evolution of its components in general and to eventually provide conclusive constraints for numerical MHD models on the other hand.

Keywords

stars: activitystars: binaries: closestars: spotsstars: rotationtechniques: spectroscopictechniques: polarimetric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 170 - 177
Copyright
Copyright © International Astronomical Union 2007

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