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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 |
References. (a)Maercker et al. (2018), (b)Aringer et al. (2009),(c)Hanner (1988), (d)Pegourie (1988),(e)Mathis et al. (1977), (f) Sacuto et al. (2011).
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