The Activity Cycles and Surface Differential Rotation of Single Dwarfs

Details The Activity Cycles and Surface Differential Rotation of Single Dwarfs The Activity Cycles and Surface Differential Rotation of Single Dwarfs

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..416..375s&link_type=abstract

Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21 ASP Conference Series, Vol. 416, proceedings

Astronomy and Astrophysics

Astronomy

5

Scientific paper

I present an updated overview of activity cycles in cool stars. Long-term study of magnetic proxies such as Ca II HK emission and photometry are the primary tools for investigating stellar activity cycles. I focus on cycle data from these sources, specifically for single dwarf stars. These restrictions reduce two areas of uncertainty: structural changes due to evolution and the effects of binarity. I explore the relationships between cycle period, cycle amplitude and various stellar properties, including rotation and surface differential rotation (SDR). Cycle period relationships are somewhat ambiguous; similar restrictions on the data set for SDR, however, reveal interesting trends. Speculations on what the results might imply for the dynamo are wildly tossed about.

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