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Constraining stellar and orbital co-evolution from the oscillating red-giant binaries revealed by Gaia DR3

Paul G. Beck
Instituto de Astrofísica de Canarias, Spain

The evolution of stars and their hosting binary systems is a highly interactive process and cannot be investigated in a segregated manner. Due to the constraints drawn by stellar binarity, oscillating red-giant stars in binary systems represent a unique opportunity to study details of the structure and evolution of stars in the advanced phases of stellar evolution. Until recently, the number of known systems hosting solar-like oscillators was small. In this talk, we will discuss the results and lessons-learned from the joint analysis of space photometry from NASA Kepler and TESS, ground-based high-resolution spectroscopy such as APOGEE, and astrometry and spectroscopy from space with the ESA Gaia satellite. The properties of this growing group with currently more than 1000 oscillating stellar objects in binary systems provide vital diagnostics on how binary systems and their stellar components coevolve.
After a brief introduction to seismology of red-giant stars, we will highlight the results of the ensemble study on stellar activity and the effects of star-star interaction on the binary orbit as a function of the evolutionary state of the primary component. Finally, we will solve the mystery of the missing eclipsing binary systems in space photometry of Kepler and TESS.

2023 November 29, 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