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Evolution of magnetic activity in intermediate-mass giants

Published online by Cambridge University Press:  07 August 2014

Philippe Gondoin
Philippe Gondoin*
Affiliation:
European Space Agency, ESTEC, Postbus 299, 2200 AG, the Netherlands email: pgondoin@rssd.esa.int
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Abstract

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The X-ray surface fluxes of intermediate-mass G and K giants are correlated with their rotation periods and Rossby numbers. Empirical relationships are presented that accounts for the X-ray luminosity evolution of single intermediate-mass giants, such as FK Comae-type stars, and of giants in close or long-period binaries, such as RS CVn-type systems, as they evolve off the main sequence towards the top of the red giant branch.

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