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

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

2010-08-25

arxiv.org/abs/1008.4399v1

Science.329:1032,2010

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Brevia text and supporting online material, published in Science

Scientific paper

10.1126/science.1191064

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.

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