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CoRoT Reveals a Magnetic Activity Cycle in a Sun-Like Star

Metcalfe, Travis S.; García, Rafael A.; Mathur, Savita +4 more

The 11-year activity cycle of the Sun is a consequence of a dynamo process occurring beneath its surface. We analyzed photometric data obtained by the CoRoT space mission, showing solarlike oscillations in the star HD49933, for signatures of stellar magnetic activity. Asteroseismic measurements of global changes in the oscillation frequencies and …