Table 3.
Constrained parameter ranges for circumstellar dust around R Dor.
| Parameter | DHS (Min–Max) | Mie (Min–Max) |
|---|---|---|
| MgSiO3 dust | ||
| a0 [μm] | 0.02–0.09 | 0.02–0.12 |
| ρ0 [g/cm3] | 4 × 10−17–10−14 | 10−17–10−14 |
| pρ | −4.4 to −2.8 | −4.4 to −2.8 |
| Rλ1 [R⊙] | 288–414 | 306–414 |
| Rλ2 [R⊙] | 270–414 | 270–414 |
| Rλ3 [R⊙] | 216–378 | 216–378 |
| MgFeSiO4 dust | ||
| a0 [μm] | 0.06–0.09 | 0.06–0.12 |
| ρ0 [g/cm3] | 2 × 10−17–10−14 | 2 × 10−17–10−14 |
| pρ | −4.8 to −3.0 | −4.4 to −3.0 |
| Rλ1 [R⊙] | 234–432 | 306–432 |
| Rλ2 [R⊙] | 198–432 | 198–432 |
| Rλ3 [R⊙] | 198–360 | 198–360 |
| Al2O3 dust | ||
| a0 [μm] | 0.04–0.09 | 0.04–0.12 |
| ρ0 [g/cm3] | 6.3 × 10−18–10−14 | 10−17–10−14 |
| pρ | −4.8 to −3.0 | −4.8 to −3.0 |
| Rλ1 [R⊙] | 306–414 | 306–432 |
| Rλ2 [R⊙] | 216–396 | 198–414 |
| Rλ3 [R⊙] | 198–360 | 216–360 |
Notes. Models are computed with three different dust compositions (MgSiO3, MgFeSiO4, and Al2O3) using both DHS and Mie scattering theories. Each range represents the minimum and maximum values from models that successfully reproduce the observed polarised-light measurements. All values represent equally valid solutions that successfully reproduce the observed polarised light. Parameters Rλ1, Rλ2, and Rλ3 correspond to stellar radii at wavelengths 0.65, 0.75, and 0.82 μm.
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