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Fig. 6

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Results from multi-transition excitation analysis of circumstellar line emission towards a large sample of AGB stars with varying physical and chemical properties. Left – HCN fractional abundance, f0(HCN), as a function of a density measure (/υe) for carbon stars (filled circles), M-type AGB stars (filled squares) and S-type AGB stars (filled triangles). Middle – SiO fractional abundance, f0(SiO), as a function of a density measure (/υe) for carbon stars (filled circles; Schöier et al. 2006b), M-type AGB stars (filled squares; González Delgado et al. 2003) and S-type AGB stars (filled triangles; Ramstedt et al. 2009). Right – SiS fractional abundance, f0(SiS), as a function of a density measure for carbon stars (filled circles) and M-type AGB stars (filled squares) from Schöier et al. (2007a).

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