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On the relation between rotation, convection and activity in intermediate-mass giants

Published online by Cambridge University Press:  01 August 2006

P. Gondoin
P. Gondoin*
Affiliation:
European Space Agency, ESTEC – Postbus 299, 2200 AG Noordwijk, The Netherlands
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Abstract

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I found evidence that the X-ray surface flux of intermediate-mass G and K giants is correlated with their rotation period and Rossby number. Confidence in the degree of correlation is significantly higher when stellar gravity is taken into account. An empirical relation is found that accounts for the X-ray luminosity evolution of single intermediate-mass giants and giants in close or long-period binary systems, such as RS CVn-type systems, as they evolve off the main sequence towards the top of red giant branch.

Keywords

Stellar activitystellar coronaestellar evolutionlate-type starsX-ray
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 154 - 156
Copyright
Copyright © International Astronomical Union 2007

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