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Starspots: A Key to the Stellar Dynamo

Author(s): Berdyugina Svetlana V.

Journal: Living Reviews in Solar Physics
ISSN 1614-4961

Volume: 2;
Start page: 8;
Date: 2005;
Original page

Keywords: Starspots | Sunspots | Stellar magnetic fields | Stellar cycles | Dynamo | Differential rotation | Doppler imaging

Magnetic activity similar to that of the Sun is observed on a variety of cool stars with external convection envelopes. Stellar rotation coupled with convective motions generate strong magnetic fields in the stellar interior and produce a multitude of magnetic phenomena including starspots in the photosphere, chromospheric plages, coronal loops, UV, X-ray, and radio emission and flares. Here I review the phenomenon of starspots on different types of cool stars, observational tools and diagnostic techniques for studying starspots as well as starspot properties including their temperatures, areas, magnetic field strengths, lifetimes, active latitudes and longitudes, etc. Evolution of starspots on various time scales allows us to investigate stellar differential rotation, activity cycles, and global magnetic fields. Together these constitute the basis for our understanding of stellar and solar dynamos and provide valuable constraints for theoretical models.

Tango Jona
Tangokurs Rapperswil-Jona

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