CoRoT reveals a magnetic activity cycle in a Sun-like star

Abstract

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 solar-like oscillations in the star HD49933, for signatures of stellar magnetic activity. Asteroseismic measurements of global changes in the oscillation frequencies and mode amplitudes reveal a modulation of at least 120 days, with the minimum frequency shift corresponding to maximum amplitude as in the Sun. These observations are evidence of a stellar magnetic activity cycle taking place beneath the surface of HD49933 and provide constraints for stellar dynamo models under conditions different from those of the Sun.

Brevia text and supporting online material, published in Science

References in corpus (4)

• A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry
• Asteroseismic Signatures of Stellar Magnetic Activity Cycles
• Unusual Trends in Solar P-Mode Frequencies During the Current Extended Minimum
• Impact of the physical processes in the modeling of HD49933

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