7890 20260203180939.0 10.3390/galaxies13020029 DOI SCART-2026-0079 Lobel, A. Multiplicity of Luminous Blue Variable Stars 2025 The study of Luminous Blue Variables (LBVs) is critical to understanding the mechanisms behind their recurring S Dor-like outbursts, which can span decades and feature dramatic spectral changes. These outbursts may result from atmospheric instability or interactions with a companion star, but their causes remain poorly understood. Detecting binarity in LBVs through long-term radial velocity (RV) measurements, which can identify orbital motion via shifts in absorption lines, is a promising method. Periodic line shifts and variability can reveal the presence of a companion star. We report on the monitoring of four LBVs and two candidate LBVs (cLBVs), observing high-resolution spectra from 2009 to 2024. Although we do not find a clear periodic RV signal for LBVs MWC 930, P Cyg, or HD 168607, our long-term monitoring campaign previously detected the binarity of cLBV MWC 314 in 2013. For the first time, we detected a periodic signal in the RV data of the cLBV Schulte 12. In addition, in LBV HD 168607, we observed Discrete Absorption Components, indicative of large-scale structures in a rotating wind. These findings advance our understanding of the binary nature of LBVs and their complex outburst behaviors. Horizon2020/ No.823734/ EC-POEMS; Belspo/UF/2022/10 NO massive stars binaries stellar winds outbursts spectroscopy radial velocity monitoring Gorlova, N. Galaxies 13 2025 2 id.29 alex.lobel@ksb-orb.be https://www.mdpi.com/2075-4434/13/2/29 published in REFERD