Open Access
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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