Table 4
Best-fit model parameters and uncertainties derived for CPD-57° 2874 from a χ2 minimisation.
| Adopted distance | d = 1.7 kpc | d = 2.5 kpc | ||
Reduced  |
|
|
||
| Model parameters | value | error | value | error |
|
|
||||
 (105Wm-2 μm-1str-1) |
2.2 |
|
4.2 |
|
| α | 2.4 |
|
2.4 |
|
| Tin (K)(a) | 1498 |
|
1500 |
|
| γ | 1.02 |
|
0.86 |
|
| Rin (AU) | 12.7 |
|
14.4 |
|
| i (°) | 61.3 |
|
59.6 |
|
| PAd (°) | 140.3 |
|
139.4 |
|
| A 2 (b) | −0.98 | – | −0.98 | – |
| nin (m-3)(b) | 0.30 | – | 0.33 | – |
| m (b) | 332 | – | 377 | – |
|
|
||||
| Other derived parameters | value | error | value | error |
|
|
||||
 (10-13Wm-2 μm-1)(c) |
3.5 |
|
6.8 |
|
| Rin/d (mas) | 7.5 |
|
5.8 |
|
| Δθd (°) | 7.5 | – | 7.0 | – |
Notes. The uncertainties were estimated from the 
maps.
To be physically consistent with the adopted dust composition the upper limit for Tin is 1500 K, even though the maps were allowed to explore higher temperature values.
Observed mid-IR flux from the central region at λ0 = 10 μm (Eq. (2)).
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