2024/10/28 by Zs. Kővári, Kővári, Zs.
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Astro and Planetary Science #Atomic and Subatomic Physics Research #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Solar and Stellar Astrophysics (astro-ph.SR)
paper · pdf · doi:10.48550/arxiv.2410.20961
openalex publication_date 2024/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.