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The Solar-Stellar Connection and Disconnection

Published online by Cambridge University Press:  26 May 2016

Klaus G. Strassmeier
Klaus G. Strassmeier*
Affiliation:
Astrophysical Institute Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany

Abstract

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The study of stellar activity is now an almost classical astronomical topic. The first Ca ii-H&K observations were made a hundred years ago by Eberhard & Schwarzschild1 and many thousand papers were published after its rediscovery some three decades ago by O. C. Wilson. The complexity of the atmospheric and interior magnetic activity as observed on the Sun is hard, if not impossible, to extrapolate to solar-type stars. So far there is no solar twin found, despite that it appears that just a single process acts as the driving mechanism for activity in all atmospheric layers and partially even in the convective envelope: the dynamodriven magnetic field. In this paper, I will try to give examples where the solar analogy holds and where it is clearly not appropriate, putting some emphases on differential surface rotation and meridional circulation. I stress the importance of mapping stellar surfaces as fingerprints of the underlying dynamo action and directly measure surface magnetic fields.

Type
Part 1: Introduction: The Sun, the Stars, and the Planets
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 11 - 28
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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