Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..411r&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
The apparent connection between orbital period and magnetic activity cyclic behaviour in close binaries with at least with a late-type component is addressed by analysing recent observational studies of Algols RS CVn's W UMa and CV. A theoretical model based on Applegate's mechanism seems capable of explaining the observed period variations in terms of changes of a gravitational quadrupole moment induced by a magnetic activity cycle in one of the binary components. If so the study of orbital period modulations can offer a promising tool to investigate hydromagnetic dynamos operating in the interior of active stars in particular the interaction between rotation and magnetic fiels in non-linear dynamo regimes and possibly to get some new insights into long-term evolution of angular momentum and magnetic breaking in cool stars.
Lanza Antonino Francesco
Rodono' Marcello
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