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Activity of Sun-like stars

Alexander Shapiro
Max Planck Institute for Solar System Research, Germany

Almost half a century of space-based monitoring of solar brightness have enriched us with a great amount of data from numerous missions. Driven by the climate community?s interest in links between solar variability and climate change, our understanding of solar-brightness variations has dramatically improved over the last decade.
Concurrently with solar studies, planetary-hunting space telescopes, such as CoRoT, Kepler, and TESS, unveiled brightness variations in more than a hundred thousand main sequence stars. The interest in studying stellar brightness variations is twofold. First, they provide an opportunity for studying stars themselves, e.g. for determining their rotational periods as well as for constraining properties of their magnetic cycles. Second, the quantitative assessment of stellar variability is needed for better detection and characterisation of extra-solar planets.
I review a present state-of-the-art in the studies of solar and stellar brightness variability and show how the solar paradigm can help us to explain variability of other stars and vice a versa stellar data can help us to better understand solar activity.

2019 September 04, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia