aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 117 Research articles Stars with solar-type activity: studies in recent years Gershberg Roald E. Crimean Astrophysical Observatory, Nauchny 298409 25 12 2025 6 4 1 23 22 12 2025 Copyright (c) 2026 Gershberg R. 2026 Roald E. Gershberg The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

The work systematizes and summarizes the main results of the studies of stars with solar-type activity: from the red and brown dwarfs to solar-like stars. The studies carried out primarily in the 2020s are reviewed, and the results obtained are grouped into the following sections: databases and catalogs, photospheres and starspots, rotation, chromospheres, coronae, flares, magnetic fields, activity cycles, and exoplanets.

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