Table 5: Characteristics of the various dust components used in the fitting procedure (see Sect. 5.1). The chemical formulae and assumed grain shapes have been indicated in the second and third column. In the fourth column, we give references for the refractive index data used.
Dust component Chemical formula Shape Reference

Amorphous olivine Mg_2xFe_2-2xSiO₄ Homogeneous spheres Dorschner et al. (1995)

Amorphous pyroxene Mg_xFe_1-xSiO₃ Homogeneous spheres Dorschner et al. (1995)

Crystalline forsterite Mg₂SiO₄ Irregular (DHS) Servoin & Piriou (1973)

Crystalline enstatite MgSiO₃ Irregular (DHS) Jäger et al. (1998)

Amorphous silica SiO₂ Irregular (DHS) Spitzer & Kleinman (1960)

**Table 5:** Characteristics of the various dust components used in the fitting procedure (see Sect. 5.1). The chemical formulae and assumed grain shapes have been indicated in the second and third column. In the fourth column, we give references for the refractive index data used.
Dust component	Chemical formula	Shape	Reference
Amorphous olivine	Mg_2xFe_2-2xSiO₄	Homogeneous spheres	Dorschner et al. (1995)
Amorphous pyroxene	Mg_xFe_1-xSiO₃	Homogeneous spheres	Dorschner et al. (1995)
Crystalline forsterite	Mg₂SiO₄	Irregular (DHS)	Servoin & Piriou (1973)
Crystalline enstatite	MgSiO₃	Irregular (DHS)	Jäger et al. (1998)
Amorphous silica	SiO₂	Irregular (DHS)	Spitzer & Kleinman (1960)

Source LaTeX | All tables | In the text

	1 Introduction
	2 The sample stars
	3 Observations and data reduction
	4 Description of the observations
	5 Analysis
	6 Discussion
	7 Conclusions
	References