Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars - III. SiO and SiS abundances

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Volume 709 (May 2026)

A&A, 709 (2026) A216

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Table 2

Results of RT modelling for the main isotopologues of SiO and SiS.

Source	SiO		SiS
	f₀	R_e [cm]	f₀	R_e [cm]
IRAS 15194–5115	${1.2}_{- 0.5}^{+ 0.2}$ $Mathematical equation: $\[1.2_{-0.5}^{+0.2}\]$$ × 10⁻⁶	${4.5}_{- 0.8}^{+ 2.1}$ $Mathematical equation: $\[4.5_{-0.8}^{+2.1}\]$$ × 10¹⁶	${2.0}_{- 1.0}^{+ 0.3}$ $Mathematical equation: $\[2.0_{-1.0}^{+0.3}\]$$ × 10⁻⁶	${3.6}_{- 0.9}^{+ 0.5}$ $Mathematical equation: $\[3.6_{-0.9}^{+0.5}\]$$ × 10¹⁶
IRAS 15082–4808	${1.0}_{- 0.3}^{+ 0.3}$ $Mathematical equation: $\[1.0_{-0.3}^{+0.3}\]$$ × 10⁻⁶	${4.2}_{- 0.7}^{+ 1.6}$ $Mathematical equation: $\[4.2_{-0.7}^{+1.6}\]$$ × 10¹⁶	${3.5}_{- 1.8}^{+ 0.3}$ $Mathematical equation: $\[3.5_{-1.8}^{+0.3}\]$$ × 10⁻⁶	${2.7}_{- 0.9}^{+ 1.4}$ $Mathematical equation: $\[2.7_{-0.9}^{+1.4}\]$$ × 10¹⁶
IRAS 07454–7112	${7.1}_{- 1.9}^{+ 3.2}$ $Mathematical equation: $\[7.1_{-1.9}^{+3.2}\]$$ × 10⁻⁷	${1.3}_{- 0.3}^{+ 0.5}$ $Mathematical equation: $\[1.3_{-0.3}^{+0.5}\]$$ × 10¹⁶	${4.7}_{- 1.6}^{+ 2.0}$ $Mathematical equation: $\[4.7_{-1.6}^{+2.0}\]$$ × 10⁻⁶	${7.0}_{- 2.7}^{+ 0.8}$ $Mathematical equation: $\[7.0_{-2.7}^{+0.8}\]$$ × 10¹⁵
AFGL 3068	${6.0}_{- ↓}^{+ ↑}$ $Mathematical equation: $\[6.0_{-\downarrow}^{+\uparrow}\]$$ × 10⁻⁸	${5.8}_{- ↓}^{+ ↑}$ $Mathematical equation: $\[5.8_{-\downarrow}^{+\uparrow}\]$$ × 10¹⁶	${9.0}_{- ↓}^{+ ↑}$ $Mathematical equation: $\[9.0_{-\downarrow}^{+\uparrow}\]$$ × 10⁻⁷	${1.0}_{- ↓}^{+ ↑}$ $Mathematical equation: $\[1.0_{-\downarrow}^{+\uparrow}\]$$ × 10¹⁷
IRC +10 216	${2.2}_{- 0.9}^{+ 1.3}$ $Mathematical equation: $\[2.2_{-0.9}^{+1.3}\]$$ × 10⁻⁷	${7.0}_{- 1.5}^{+ 4.0}$ $Mathematical equation: $\[7.0_{-1.5}^{+4.0}\]$$ × 10¹⁶	${3.4}_{- 1.6}^{+ 1.0}$ $Mathematical equation: $\[3.4_{-1.6}^{+1.0}\]$$ × 10⁻⁶	${2.8}_{- 1.2}^{+ 1.0}$ $Mathematical equation: $\[2.8_{-1.2}^{+1.0}\]$$ × 10¹⁶

Notes. f₀: peak abundance, R_e: e-folding radius of the abundance profile. The sub/super-scripts show the uncertainties on the values, and $_{- ↓}^{+ ↑}$ $Mathematical equation: $\[_{-\downarrow}^{+\uparrow}\]$$ indicates that the uncertainties have not been constrained. We note that the reported uncertainties do not take into account possible uncertainties in the input MLR and distance, which are taken as fixed parameters in the modelling.

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