The structure and chemistry of the massive shell around AFGL 2343: $^\mathsf{29}$SiO and HCN as tracers of high-excitation regions

G. Quintana-LacaciV. BujarrabalA. Castro‐Carrizo2026-03-222026-03-22200810.1051/0004-6361:200809559https://doi.org/10.1051/0004-6361:200809559https://andeanlibrary.org/handle/123456789/49031Citaciones: 8Context. The yellow hypergiant stars (YHGs) are very massive objects that are expected to pass through periods of intense mass loss during their evolution. Despite this, massive circumstellar envelopes have been found in only two of them, IRC +10420 and AFGL 2343.enStarsContext (archaeology)ExcitationShell (structure)AstrophysicsPhysicsChemistryThe structure and chemistry of the massive shell around AFGL 2343: $^\mathsf{29}$SiO and HCN as tracers of high-excitation regionsarticle