Talk

Magnetic activity evolution on Sun-like stars

Philippe Gondoin, European Space Agency

Characterizing the time evolution of magnetic activity on Sun-like stars is important not only for stellar physics but also for determining the environment in which planets evolve. In recent decades, many surveys of open clusters have produced extensive rotation periods measurements on Sun-like stars of different ages. I used this information with the aim to improve the description of their magnetic activity evolution. The long-term evolution of Ca II chromospheric and X-ray coronal emission from solar mass stars is inferred by combining a best fit parametric model of their rotation evolution with empirical rotation-activity relationships. The derived scenario is compared with measurements of magnetic activity indices from Sun-like stars in nearby open clusters of various ages.