The structure and chemistry of the massive shell around AFGL 2343: 29SiO and HCN as tracers of high-excitation regions

G. Quintana-Lacaci, V. Bujarrabal, A. Castro-Carrizo

The yellow hypergiant stars (YHGs) are very massive objects that are expected to pass through periods of intense mass loss during their evolution. Despite of this, massive circumst…