Binary-object spectral-synthesis in 3D (BOSS-3D)

Context. To quantitatively decode the information stored within an observed spectrum, detailed modelling of physical state and accurate radiative transfer solution schemes are required. The accuracy model is then typically evaluated by comparing calculated spectra. In analysis stellar spectra, numerical often needs to account for binary companions 3D structures in envelopes. enigmatic (or multiple) system LB-1 constitutes a perfect example such complex multi-D problem. Thus far, has been indirectly investigated 1D stellar-atmosphere codes spectral disentangling techniques, yielding differing conclusions about nature (e.g., B-star black-hole with accretion disc around black hole or stripped-star Be-star have proposed). Aims. improve our understanding system, we directly modelled phase-dependent H ? line profiles this system. end, developed present multi-purpose binary-object spectral-synthesis code (BOSS-3D). Methods. BOSS-3D calculates synthetic given circumstellar material. standard pz -geometry commonly used single stars extended defining individual coordinate systems each involved object accounting appropriate transformations. applied considering two main hypotheses, containing stripped star Be star, B disc. Results. Comparing these scenarios, neither can reproduce shape profiles. A satisfactory match observations, however, obtained invoking primary addition Conclusions. be wide variety systems, ranging from transit spectra planetary atmospheres, post-asymptotic giant branch binaries including circumbinary discs massive-star winds systems. For provides strong evidence that contains disc-like structure.