Summary of the obtained model parameters plus statistical modelling errors.
|L [L⊙]||τ 0.55 μm||Td [K]||p 1||y1 [pc]||δy [pc]||s 1||p 2||Md [M⊙]|
|S Sct||4300 ± 100||0.03 ± 0.003||46||1.0 ± 0.5||0.13 ± 0.01||0.02||45 ± 10||2.0||(7 ± 2) × 10-5|
|RT Cap||2200 ± 50||0.21 ± 0.05||39||1.75 ± 0.03||0.13 ± 0.01||0.016 ± 0.007||13 ± 6||2.0||(1.0 ± 0.2) × 10-5|
Notes. L is the luminosity of the central star, τ is the optical depth of the entire dust envelope. y1 and δy are the radius and width of the detached shell, given in pc. The condensation temperature Tc was kept fixed at 1000 K. Td is the dust temperature at distance y1 and Md is the dust mass in the detached shell. The given absolute shell thicknesses δy correspond to an angular size of 10″ and 11″ for S Sct and RT Cap. The provided errors are the variation of the parameters that would yield a χ2 = 1, including all observational constraints. For the shell thickness of S Sct no error is provided, since due to large variations of δy no credible value could be obtained and the parameter was eventually kept fixed.
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