Table 1
2Dust Parameters For LPV 28579.
| Photosphere model a | |
| Teff(K) | 3000 |
| L∗(L⊙) | 6580 (6150–7010)b (Epoch 1) |
| 4810 (Epoch 2) | |
| R∗(R⊙) | 325 (Epoch 1) |
| C/O | 1.3 |
| Dust shell properties | |
| Rin(R∗) | 4.4 (4.0–4.8) |
| Rout(Rin) | 1000 |
| Density profile | ρ(r) ~ r-2 |
| vexp(km s-1) | 10 |
| Gas:dust ratio | 200 |
| Dust grain properties | |
| Species | AmCc + SiCd |
| SiC fraction | 12% (10%–16%) |
| τ(11 μm) | 0.27 (0.25 – 0.275) |
| Size distribution | KMHe |
| amin(μm) = 0.01 (<0.1) | |
| a0(μm) = 1 (0.75–1.3) | |
| γ = 3.5 | |
| Mass-loss rate and dust temperature | |
| Ṁd( × 10-9 M⊙ yr-1) | 2.5 (2.4–2.9) |
| Ṁg( × 10-7 M⊙ yr-1) | 5.0 (4.8–5.8) |
| Tin(K) | 1310 (1260–1380) |
Notes.
Photosphere model from Gautschy-Loidl et al. (2004).
Uncertainty in parameter value (see Sect. 3.1.5 for details).
Amorphous carbon grains, ρ = 1.8 g cm-3, optical constants from Zubko et al. (1996).
SiC grains, ρ = 3.22 g cm-3, optical constants from Pégourié (1988).
Size distribution from Kim et al. (1994): n(a) ~ a − γexp(−a/a0) with a > amin.
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