De Cat, Peter ; Frasca, Antonio ; Alonso-Santiago, Javier ; Catanzaro, Giovanni ; Molenda-Żakowicz, Joanna ; Wang, Jiangtao ; Li, Chun-qian ; Shi, Jianrong ; Fu, Jianning ; Zong, Weikai

Poster presented at Stellar Variability: Taking the Pulse of the Universe, Pune, India on 2025-11-24

Abstract: The evolution of a star in a gravitationally bound stellar system can be significantly influenced by the proximity of its companion(s). However, the full range of these effects remains incompletely understood. Double-lined binaries and higher-order multiple-lined systems offer a clear advantage: the characteristics of more than one component can be extracted from high-resolution spectroscopy, providing stronger constraints for modeling efforts. In 2023, we initiated a spectroscopic follow-up program using the High Efficiency and Resolution Mercator Echelle Spectrograph (HERMES), mounted on the 1.2-m Mercator Telescope at the Roque de los Muchachos Observatory (La Palma, Canary Islands, Spain). The goal is to obtain spectroscopic data for an initial characterization of candidate double-lined and triple-lined systems recently identified by Frasca et al. (2022, A&A 664, A78) using medium-resolution observations from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) survey at Xinglong Observatory (Xinglong, China). For a comprehensive analysis, these new spectra will be combined with ground-based data from other facilities and with space-based light curves from the Kepler and TESS missions, in order to improve our understanding of these systems. In this poster, we present the first results after 1.5 years of HERMES observations. The project also stands to benefit from future observations with the high-resolution spectrograph that will be installed on the 3.6-m Devasthal Optical Telescope (DOT) at Devasthal Observatory (India), which will enable the study of fainter targets.