6668 20240125153628.0 SEMIN-2024-0018 Merle, Thibault Spectroscopic binaries and higher-order systems in large surveys 2023 2023-11-07 Multiplicity among field and cluster stars is ubiquitous. The properties of binary stars are therefore fundamental to understand how stars were formed and how they evolve. Interaction processes between components may lead to complex outcomes like chemically peculiar stars, stripped stars, transients and merger events. Binaries are easily identified through radial velocity variations measured in spectroscopy. Large spectroscopic surveys, like the Gaia-ESO survey (GES), are providing high accuracy radial velocities and chemical abundances for hundreds of thousands of stars. Among them, spectroscopic multiple stellar systems (spectroscopic binaries with one ore more visible components: SBn, with n ≥ 1) deserve special investigation since the determined radial velocities and chemical abundances could be potentially affected by multiplicity. In this talk, I will summarize the findings obtained in the GES in terms of stellar multiplicity and the statistical properties of binary stars and present perspective in the context of other surveys (GALAH, 4MOST, MSE). Prf-2020-033_BISTRO/ Prf-2020-033_BISTRO/ Prf-2020-033_BISTRO NO Ljubljana University thibault.merle@ksb-orb.be 9483649 http://publi2-as.oma.be/record/6668/files/presentation_ljubljana.pdf 6464 http://publi2-as.oma.be/record/6668/files/presentation_ljubljana.gif?subformat=icon icon 7591 http://publi2-as.oma.be/record/6668/files/presentation_ljubljana.jpg?subformat=icon-180 icon-180 SEMIN