![Figure caption: Zooming into the core of the sigma Orionis cluster, from the Orion constellation to the sigma Ori Aa,Ab,B triple system. Image credits: Gabriel Pérez (SMM, IAC), Sergio Simón-Díaz (IAC/ULL) and J.A. Caballero (CAB/CSIC), from a composition Figure caption: Zooming into the core of the sigma Orionis cluster, from the Orion constellation to the sigma Ori Aa,Ab,B triple system. Image credits: Gabriel Pérez (SMM, IAC), Sergio Simón-Díaz (IAC/ULL) and J.A. Caballero (CAB/CSIC), from a composition](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados147_161.jpg?itok=Fq8Fp4_v)
We provide a complete characterization of the astrophysical properties of the σ Ori Aa, Ab, B hierarchical triple system and an improved set of orbital parameters for the highly eccentric σ Ori Aa, Ab spectroscopic binary. We compiled a spectroscopic data set comprising 90 high-resolution spectra covering a total time span of 1963 days. We applied the Lehman-Filhés method for a detailed orbital analysis of the radial velocity curves and performed a combined quantitative spectroscopic analysis of the σ Ori Aa, Ab, B system by means of the stellar atmosphere code FASTWIND. We used our own plus
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