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Short-lived spots in solar-like stars as observed by CoRoT

TitreShort-lived spots in solar-like stars as observed by CoRoT
Type de publicationJournal Article
Year of Publication2009
AuteursMosser, B, Baudin, F, Lanza, AF, Hulot, JC, Catala, C, Baglin, A, Auvergne, M
JournalAstronomy & Astrophysics
Date PublishedOct
ISBN Number0004-6361
Numéro d'accèsWOS:000271052700027

Context. CoRoT light curves have an unprecedented photometric quality, having simultaneously a high signal-to-noise ratio, a long time span and a nearly continuous duty-cycle. Aims. We analyse the light-curves of four bright targets observed in the seismology field and study short-lived small spots in solar-like stars. Methods. We present a simple spot modeling by iterative analysis. Its ability to extract relevant parameters is ensured by implementing relaxation steps to avoid convergence to local minima of the sum of the residuals between observations and modeling. The use of Monte-Carlo simulations allows us to estimate the performance of the fits. Results. Our starspot modeling gives a representation of the spots on these stars in agreement with other well tested methods. Within this framework, parameters such as rigid-body rotation and spot lifetimes seem to be precisely determined. Then, the lifetime/rotation period ratios are in the range 0.5-2, and there is clear evidence for differential rotation.

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