Skip to Main content Skip to Navigation
Journal articles

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 solarlike 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
Complete list of metadatas

Cited literature [25 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-00865988
Contributor : Bruno Savelli <>
Submitted on : Monday, October 21, 2019 - 10:40:38 AM
Last modification on : Wednesday, September 23, 2020 - 4:36:18 AM
Long-term archiving on: : Wednesday, January 22, 2020 - 2:20:04 PM

File

Gar.pdf
Files produced by the author(s)

Identifiers

Citation

Rafael A. García, Savita Mathur, David Salabert, Jérôme Ballot, Clara Régulo, et al.. CoRoT reveals a magnetic activity cycle in a Sun-like star. Science, American Association for the Advancement of Science, 2010, 329 (5995), pp.1032. ⟨10.1126/science.1191064⟩. ⟨cea-00865988⟩

Share

Metrics

Record views

722

Files downloads

757