Table 5
Results from modeling of the free-free continuum for mm-RRL non-detections (Sect. 5.4).
| Source | Rout(90%) | Rout(99%) | ne(6.68 au) | α n | Ṁ pAGB | Mion(90%) | tk(90%) | |
| name | (au) | (au) | ( cm-3) | (M⊙ yr-1) | (M⊙) | (yr) | ||
|
|
||||||||
| He 3−1475 | 185 | 840 | 6.2 × 108 | 2.18 | 4.4 × 10-6 | 1.7 × 10-6 | 60 | |
| M 1−91 | 44 | 144 | 4.7 × 107 | 2.10 | 3.4 × 10-7 | 4.2 × 10-6 | 14 | |
| M 1−92 | 40 | 132 | 4.1 × 107 | 2.10 | 3.0 × 10-7 | 3.5 × 10-6 | 13 | |
| IRAS 20462 | 22 | 67 | 2.4 × 108 | 3.13 | 1.7 × 10-6 | 2.9 × 10-5 | 7 | |
| M 2−56 | 12 | 24 | 7.0 × 107 | 3.50 | 5.0 × 10-7 | 2.3 × 10-5 | 4 | |
Notes. In all cases, the central ionized regions were modeled assuming spherical isothermal winds; we adopt Vexp = 15 km s-1, Te = 10 000 K, ne ∝ r− αn, and inner radius Rin = 0.05 au. The mass and kinematic age of the ionized gas layers within Rout(90%), i.e., the radius that encircles 90% of the ~3 mm continuum flux, are given in the last two columns.
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