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Dynamic Asteroseismology: towards improving the theories of stellar structure and (tidal) evolution
Andrew Tkachenko (Institute of Astronomy, KU Leuven)
Many fields in (stellar) astrophysics have been revolutionized with the launch of space missions like MOST, CoRoT, Kepler/K2, and soon TESS. Asteroseismology and binary star research areas are among domains that have benefited from high-quality space-based photometric data the most. An observational probe of the near core regions, as well as the measurements of the surface-to-core rotation have recently become available for MS stars of spectral types B to F. Space-based data provided us with new insights into stellar objects at advanced evolutionary stages, revolutionized our understanding of evolved red-giant stars exhibiting stochastically excited solar-like oscillations, and significantly improved our understanding of stars during early, pre-main-sequence stages of their evolution. On the other hand, dynamical measurements of fundamental properties of individual binary components to precisions approaching 1% became available for many systems and in large mass and age ranges. Many A- to B-type stars in binaries are found to exhibit both self-excited and tidally induced stellar oscillations. Although intended to improve the current theories of stellar structure and evolution (SEE), asteroseismology is itself a model-dependent research field, with the dependency being significantly larger for intermediate- and high-mass stars than for sun-like stars. Insufficient quality of observations is no longer a limiting factor for a new series of progressions in asteroseismology, but the shortcomings in the current theories of SEE become a real bottleneck. Likely, many pulsating stars are found in binary systems across the whole HR-diagram which gives us the unique opportunity to supply asteroseismic investigations with additional, model-independent observational constraints in terms of the dynamical masses and radii of stars. In this talk, I will focus on the advantages of combining the two complenetary research areas, asteroseismology and binary stars, and on the role of K2 and TESS missions in providing us with high-quality observational input.