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Orbital Motion and Magnetic Activity in Close Binaries and Planetary Systems

Published online by Cambridge University Press:  26 May 2016

Marcello Rodonò  and
Antonino F. Lanza
Marcello Rodonò
Affiliation:
Dipartimento di Fisica e Astronomia, Università degli Studi, Via S. Sofia, 78, 95123 Catania, Istituto Nazionale di Astrofisica (INAF), Viale del Parco Mellini, 84, 00136 Roma
Antonino F. Lanza
Affiliation:
INAF - Osservatorio Astrofisico di Catania, Via S. Sofia, 78, 95123 Catania, Italy

Abstract

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The connection between orbital period variation and magnetic activity cyclic behaviour in close binaries with late-type components is addressed by discussing recent observational studies of Algols, RS CVn's, W UMa's and CVs. A theoretical model based on the Applegate's mechanism seems capable of explaining the observed orbital period modulation in terms of cyclic changes of a gravitational quadrupole moment induced by a magnetic activity cycle affecting one of the binary components. In such a case, the study of orbital period modulations offers a promising tool to investigate hydromagnetic dynamos operating in the interior of active stars, in particular, to address the fundamental question of the interaction between rotation and magnetic fields in nonlinear dynamo regimes. Moreover, interesting applications to planetary systems with a magnetically active central star are discussed.

Type
Part 8: Stellar Analogues for Interaction and Evolution
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 411 - 422
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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