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Long-term variations in the X-ray activity of HR 1099

Schmitt, J. H. M. M.; Robrade, J.; Schneider, P. C. +6 more

Context. Although timing variations in close binary systems have been studied for a long time, their underlying causes are still unclear. A possible explanation is the so-called Applegate mechanism, where a strong, variable magnetic field can periodically change the gravitational quadrupole moment of a stellar component, thus causing observable pe…