CAOSP abstracts, Volume: 55, No.: 3, year: 2025

Author(s): Kővári, Zs.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 55, no. 3, p. 182-195.
Date: 04/2025
Title: Magnetic activity in close binary systems
Keyword(s): binaries: close, binaries: eclipsing, stars: late-type, stars: activity, stars: starspots, stars: flare, stars: imaging
Pages: 182 -- 195
DOI: https://doi.org/10.31577/caosp.2025.55.3.182
NASA ADS Abstract Service: 2025CoSka..55c.182K
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

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 dinamo operation in RS CVn and BY Dra type systems is briefly reviewed in terms of spot cycles, active longitudes, flare activity, and differential rotation.