ACES Tidal Dissipation in Cool Evolved Stars - Mats Esseldeurs (KU Leuven, Belgium)
As the observed occurrence of companions orbiting cool evolved stars is increasing, so does the importance of understanding and evaluating the strength of their interactions. This is important for both the further evolution of each component in the system, but also the evolution of the system itself. One of the fundamental mechanisms to understand this interaction is the
tidal dissipation in these stars, as it is one of the engines of orbital/rotational evolution of starplanet/star-star systems. As current population-synthesis models don’t agree with the observed period and eccentricity distribution of post-AGB stars, the need arises to revise the tidal dissipation mechanisms used in these studies. In this presentation I will present the first ab-initio
calculations of tidal dissipation strengths during the entire evolution of low and intermediate mass stars, of both the equilibrium tide (currently equations are used calibrated on the MS), and the dynamical tide (currently not accounted for), showing their importance in different regions of the parameter space. These parameters are key in predicting the future evolution of these binary stars, offering a way forward to a renewed understanding of orbital evolution during the evolved phases.
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