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Table 2
Input and fit parameters of R71.
| Input parameters | |||
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| Stellar parameters | Symbol | Value | Reference |
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| Initial mass | M ZAMS | 40 M⊙ | Lennon et al. (1993) |
| Mass | M ⋆ | 20 M⊙ | Lennon et al. (1993) |
| Radius | R ⋆ | 95 R⊙ | Lennon et al. (1993) |
| Effective temp. | T eff | 17 000 K | Lennon et al. (1993) |
| Luminosity | L ⋆ | 7 × 105 L ⊙ | Lennon et al. (1993) |
| Distance | d | 50 000 pc | Schaefer (2008) |
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| Fit parameters | |||
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| Dust-shell parameters | Symbol | Value | Reference |
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| Inner dust radius | R in | 1.0 × 104 AU | – |
| Outer dust radius | R out | 6.0 × 104 AU | – |
| Dust mass | M dust | 0.01 M⊙ | – |
| Density distribution | ρ(r) | ρ(r) ≈ r-2 | – |
| Dust/gas | f d/g | 1/500 | van Loon et al. (1999); Sargent et al. (2011) |
| Expansion velocity | v exp | 60 km s-1 | Wolf et al. (1981) |
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| Dust composition | Symbol | Mass abundance | Reference |
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| Amorp. silicates | MgSiO3 | 63% | Jäeger et al. (1994) |
| Amorp. silicates | MgFeSiO3 | 30% | Jäeger et al. (1994 |
| Crys. silicates | Mg2SiO4) | 3% | Jäeger et al. (1994) |
| Metallic iron | Fe | 3% | Pollack et al. (1994) |
| Polycyclic aromatic hydrocarbon | PAH | 0.1% | Draine & Li (2007) |
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| Dust grain properties | Symbol | Value | Reference |
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| Min. dust size (silicates) | a min | 0.01 μm | Mathis et al. (1977) |
| Max. dust size (silicates) | a max | 0.1 μm | Mathis et al. (1977) |
| Min. dust size (PAHs) | a min | 0.001 μm | Mathis et al. (1977) |
| Max. dust size (PAHs) | a max | 0.0011 μm | Mathis et al. (1977) |
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