Table 6
Dusty circumstellar envelope parameters of R Scl deduced from the best-fitting COMARCS+DUSTY model on the spectrophotometric and the near- and mid-infrared interferometric measurements.
| Parameter | Value |
|
|
|
| Shell inner radius: εin (mas) | 22.4 |
| Inner boundary temperature: Tin (K) | 1200 |
| Grain chemical composition1 | 90% AmCr + 10% SiCp |
| Grain size distribution2 | MRN |
| Geometrical thickness: Y (inner radii) | 1000 |
| Visual optical depth: τ0.55 μm | 0.40 |
| 1.0 μm optical depth: τ1.0 μm | 0.18 |
| 11.2 μm optical depth: τ11.2 μm | 7.6 × 10-3 |
| Mass-loss rate3: Ṁ (M⊙ yr-1) | (6.7 ± 2) × 10-7 |
Notes.
AmCr stands for amorphous carbon of Rouleau & Martin (1991) and SiCp for silicon carbide of Pégourié (1988);
grain size distribution as described by Mathis et al. (1977);
assuming a dust grain bulk density ρs = 1.85 g cm-3 (Rouleau & Martin 1991) and a gas-to-dust mass ratio rgd = 590 (Schöier et al. 2005).
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