Asteroseismic Signatures of Magnetic Activity Variations in Solar-type Stars

Abstract

Observations of magnetic activity cycles in other stars provide a broader context for our understanding of the 11-year sunspot cycle. The discovery of short activity cycles in a few stars, and the recognition of analogous variability in the Sun, suggest that there may be two distinct dynamos operating in different regions of the interior. Consequently, there is a natural link between studies of magnetic activity and asteroseismology, which can characterize some of the internal properties that are relevant to dynamos. I provide a brief historical overview of the connection between these two fields (including prescient work by Wojtek Dziembowski in 2007), and I highlight some exciting results that are beginning to emerge from the Kepler mission.

4 pages, 1 figure, proceedings of IAU Symposium 301: Precision Asteroseismology

References in corpus (7)

• Seismic evidence for a rapidly rotating core in a lower-giant-branch star observed with Kepler
• CoRoT reveals a magnetic activity cycle in a Sun-like star
• Discovery of a 1.6-year Magnetic Activity Cycle in the Exoplanet Host Star iota Horologii
• Magnetic Activity Cycles in the Exoplanet Host Star epsilon Eridani
• Frequency, splitting, linewidth and amplitude estimates of low-l p modes of alpha Cen A: analysis of WIRE photometry
• Sounding stellar cycles with Kepler - II. Ground-based observations
• Asteroseismic Signatures of Stellar Magnetic Activity Cycles