2008CoAst.152..124S

Photometric time series of active stars can pin down some of the ingredients that govern the stellar magnetic field, itself being the driver of all non-thermal stellar emissions. Among the most important – and least understood – astrophysical ingredients is stellar rotation and its subtle latitudinal dependence called differential rotation. Rotation switches on and maintains the internal dynamo, itself a phenomenon from the interaction of turbulent plasma motions and large-scale shearing forces in the deep stellar interior. I propose to observe the active binary Capella, made up of two giants in exposed locations in the HR-diagram. Along with Capella (αAur), another eight stars brighter than 4th magnitude would be in the field-of-view of BRITE, among them such benchmark variables as ζ∼Aur or θ∼Aur.