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Table 1

Main parameters of the Class I model.

Quantity Symbol Value

stellar mass M 0.5 M
stellar effective temp. T 5000 K
stellar luminosity L 1.0 L

disk gas mass Mdisk 0.02 M
disk inner radius Rin 0.6 au
disk tapering-off radius Rtap 100 au
column dens. pow. ind. ϵ 1.0
tapering parameter γ 1.0
reference scale height H(100au) 10 au
flaring power index β 1.1

centrifugal radius R c 100 au
mass infall rate if 5 × 10-6M yr-1
outer radius R out 5000 au
cavity opening angle β cav 20°

dust to gas mass ratio δ 0.01
min. dust particle radius a min 0.005 μm
max. dust particle radius a max
envelope 1 μm
disk 1000 μm
dust size dist. power ind. a pow 3.5
dust compositiona Mg0.7Fe0.3SiO3 60%
(volume fractions) amorph. carbon 20%
vacuum 20%

cosmic ray H2 ion. rate ζ CR 5 × 10-17 s-1
strength of interst. FUV χ ISM 1b

distance d 200 pc



Optical constants are from Dorschner et al. (1995) and Zubko et al. (1996, BE-sample); resulting dust material density ρdp ≈ 2.2 g:cm-3.


χISM is given in units of the Draine field (Draine & Bertoldi 1996; Woitke et al. 2009).

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