Table 3
The fit model parameters.
| Model | L⋆ | Teffd | θ LD | E(B − V) | T in | θ in | τ 0.55 μm | Ṁ | α |
|
# | |
| (L⊙) | (K) | (mas) | (K) | (mas) | (× 10-3) | (M⊙ yr-1) | (%) | |||||
|
|
||||||||||||
| X Sgr | ||||||||||||
| Al2O3a | 2151 ± 34 | 5900 | 1.24 ± 0.08 | 0.199 ± 0.009 | 1732 ± 152 | 13.2 | 6.5 ± 0.8 | 5.1 × 10-8 | 13.0 | 0.78 | 1 | |
| W-Sb | 2155 ± 40 | 5900 | 1.24 ± 0.08 | 0.200 ± 0.011 | 1831 ± 141 | 14.7 | 11.8 ± 0.2 | 6.4 × 10-8 | 15.0 | 1.53 | 2 | |
| Fec | 2306 ± 154 | 5900 | 1.28 ± 0.09 | 0.230 ± 0.031 | 1456 ± 605 | 29.3 | 8.9 ± 4.4 | 6.2 × 10-8 | 9.5 | 4.30 | 3 | |
| 70% Al2O3 + 30% W-S | 2153 ± 31 | 5900 | 1.24 ± 0.08 | 0.200 ± 0.009 | 1519 ± 117 | 19.6 | 6.6 ± 0.7 | 5.6 × 10-8 | 13. 7 | 0.58 | 4 | |
| 60% Al2O3 + 20% W-S + 20% Fe | 2160 ± 35 | 5900 | 1.24 ± 0.08 | 0.201 ± 0.009 | 1802 ± 130 | 13.9 | 10.6 ± 1.2 | 6.1 × 10-8 | 13.3 | 0.68 | 5 | |
|
|
||||||||||||
| T Mon | ||||||||||||
| Fe | 12 453 ± 775 | 5200 | 0.98 ± 0.03 | 0.183 ± 0.049 | 1190 ± 59 | 29.4 | 113 ± 21 | 5.0 × 10-7 | 99.5 | 5.36 | 1 | |
| 80% Fe + 10% W-S + 10% Al2O3 | 11 606 ± 434 | 5200 | 0.94 ± 0.03 | 0.144 ± 0.028 | 1418 ± 42 | 16.6 | 126 ± 13 | 4.4 × 10-7 | 82.2 | 1.52 | 2 | |
| 90% Fe + 10% W-S | 11 696 ± 667 | 5200 | 0.95 ± 0.03 | 0.149 ± 0.044 | 1389 ± 54 | 18.0 | 147 ± 23 | 5.0 × 10-7 | 94.6 | 3.04 | 3 | |
| 90% Fe + 10% Al2O3 | 11 455 ± 580 | 5200 | 0.94 ± 0.03 | 0.137 ± 0.040 | 1439 ± 49 | 15.9 | 158 ± 21 | 5.0 × 10-7 | 87.5 | 2.21 | 4 | |
| 90% Fe + 5% Al2O3 + 5% W-S | 11 278 ± 597 | 5200 | 0.93 ± 0.04 | 0.125 ± 0.042 | 1458 ± 48 | 15.3 | 170 ± 23 | 5.2 × 10-7 | 93.6 | 2.22 | 5 | |
Notes. L⋆, Teff and θLD are the stellar luminosity, temperature and angular diameter, respectively. Tin and θin are respectively the dust temperature at the inner radius and the inner diameter of the dust shell. τ0.55 μm is the optical depth at 0.55 μm and Ṁ denotes the mass-loss rate. α stands for the relative excess (ratio of the envelope to the photosphere flux).
From Begemann et al. (1997).
Warm silicate from Ossenkopf & Henning (1994).
Iron from Henning & Stognienko (1996).
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