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Table 1

Physico-chemical parameter values of the COMARCS (top part) and DUSTY (bottom part) models.

Model parameter Parameter value Fixed
Distance 360 ± 50 pc (a) Yes
Surface gravity −0.50 ± 0.10 cm s−2 No
Stellar surface temperature 2700 ± 100 K No
Stellar Luminosity 8000 ± 1000 L No
Stellar mass 2.0 ± 0.5 M No
C/O ratio No
Microturbulent velocity 2.5 km.s−1 (b) Yes
Rosseland Radius 1.91 ± 0.20 au 5.3 ± 0.6 mas No

Shell chemical composition AmC (c) and SiC (d) 88 ± 11% of AmC@@ 12 ± 11% of SiC No
Dust grain-size distribution n(a) ∝ a−35 (e) Yes
Optical depth at λ = 1µm 0.19 ± 0.05 No
Inner boundary temperature 1200 ± 100 K(f) Yes
Inner radius 24.5 ± 9.0 mas@@ 4.6 ± 1.7 R* No
Outer radius 1000 Rin (e) Yes
Mass-loss rate 1.2 ± 0.4 × 10−6 M yr−1 No

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