Magnetic activity in close binary systems

TL;DR

This paper reviews how tidal forces in close binary systems influence magnetic activity, including effects on stellar rotation, dynamo modes, and observable phenomena like active longitudes and flares.

Contribution

It provides a synthesis of recent observations and theories on magnetic activity in close binary systems, highlighting the role of tidal interactions and dynamo processes.

Findings

Tidal forces sustain rapid stellar rotation in close binaries.

Active longitudes are linked to non-axisymmetric dynamo modes.

Close binaries show enhanced flare activity and complex spot cycles.

Abstract

Tidal forces in close binary systems have diverse impacts on magnetic activity. The synchronicity characteristic of close systems counteracts magnetic braking, thereby sustaining rapid rotation-a key factor in increased levels of magnetic activity. Tidal effects can also work against the slowing down of rotation during stellar evolution, when the star inflates into a red giant. A notable manifestation of the effect of binarity on activity in such systems is the appearance of active longitudes, which are thought to arise from the excitation of non-axisymmetric dynamo modes. Through some recent examples, the dynamo operation in RS CVn and BY Dra type systems is briefly reviewed in terms of spot cycles, active longitudes, flare activity, and differential rotation.