Detailed equilibrium and dynamical tides: impact on circularization and synchronization in open clusters Mirouh, Giovanni Marcello Hendriks, David D. Dykes, Sophie Moe, Maxwell Izzard, Robert G. Stars: evolution Stars: rotation Open clusters and associations: general The authors acknowledge fruitful discussions during the PIMMS workshop (https://www.ias.surrey.ac.uk/event/pulsations-mass-stars/). We are grateful to the referee R. Mathieu for numerous suggestions that helped improve the paper greatly, to both him and A. Nine for providing details about their observations, and to P. Das for her guidance about statistical inferences. GMM and RGI acknowledge funding by the STFC consolidated grants ST/L003910/1 and ST/R000603/1. DDH acknowledges funding by the UKRI grant H120341A. Binary stars evolve into chemically peculiar objects and are a major driver of the galactic enrichment of heavy elements. During their evolution they undergo interactions, including tides, that circularize orbits and synchronize stellar spins, impacting both individual systems and stellar populations. Using Zahn's tidal theory and mesa main-sequence model grids, we derive the governing parameters & lambda;(lm) and E-2, and implement them in the new mint library of the stellar population code binary_c. Our mint equilibrium tides are two to five times more efficient than the ubiquitous bse prescriptions, while the radiative-tide efficiency drops sharply with increasing age. We also implement precise initial distributions based on bias-corrected observations. We assess the impact of tides and initial orbital-parameter distributions on circularization and synchronization in eight open clusters, comparing synthetic populations and observations through a bootstrapping method. We find that changing the tidal prescription yields no statistically significant improvement as both calculations typically lie within 0.5 & sigma;. The initial distribution, especially the primordial concentration of systems at log(10)(P/d) & AP; 0.8, e & AP; 0.05 dominates the statistics even when artificially increasing tidal strength. This confirms the inefficiency of tides on the main sequence and shows that constraining tidal-efficiency parameters using the e - log(10)(P/d) distribution alone is difficult or impossible. Orbital synchronization carries a more striking age-dependent signature of tidal interactions. In M35 we find twice as many synchronized rotators in our mint calculation as with bse. This measure of tidal efficiency is verifiable with combined measurements of orbital parameters and stellar spins. 2023-09-28T08:16:08Z 2023-09-28T08:16:08Z 2023-07-08 journal article Giovanni M Mirouh, David D Hendriks, Sophie Dykes, Maxwell Moe, Robert G Izzard. Detailed equilibrium and dynamical tides: impact on circularization and synchronization in open clusters. Monthly Notices of the Royal Astronomical Society, Volume 524, Issue 3, September 2023, Pages 3978–3999. [https://doi.org/10.1093/mnras/stad2048] https://hdl.handle.net/10481/84707 10.1093/mnras/stad2048 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Oxford University Press