Table 2: Parameters for HM Sge deduced from the best-fit DUSTY model to the spectrophotometric and interferometric data.
Parameter Value

Effective temperature (K) 3000

Central star diameter (mas) 1.6

Luminosity ( $L_{\odot}$ ) 5000

Distance (kpc) 1.5

Shell inner radius: $\varepsilon_{\rm in}$ (mas) 3.6

Inner boundary temperature (K) 1600

Grain chemical composition 100 $\%$ Sil-Ow¹

Density power law coefficient 2.2

Grain size distribution MRN²

Geometrical thickness ( $\varepsilon_{\rm in}$ ) 1000

Visual optical depth 25.2

10 $\mu$ m optical depth 2.15

**Table 2:** Parameters for HM Sge deduced from the best-fit `DUSTY` model to the spectrophotometric and interferometric data.
Parameter	Value
Effective temperature (K)	3000
Central star diameter (mas)	1.6
Luminosity ( $L_{\odot}$ )	5000
Distance (kpc)	1.5
Shell inner radius: $\varepsilon_{\rm in}$ (mas)	3.6
Inner boundary temperature (K)	1600
Grain chemical composition	100 $\%$ Sil-Ow¹
Density power law coefficient	2.2
Grain size distribution	MRN²
Geometrical thickness ( $\varepsilon_{\rm in}$ )	1000
Visual optical depth	25.2
10 $\mu$ m optical depth	2.15

¹ Sil-Ow stands for ``warm'' silicates of Ossenkopf et al. (1992).
² Grain size distribution as described by Mathis et al. (1977).

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