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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).

(b)

Warm silicate from Ossenkopf & Henning (1994).

(d)

Hold fixed.

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