Table 2
Asymmetry parameters for observations and models.
| 18.1 | 24.5 | ||||||
| e f |  [%] |
 [%] |
[%] |
[%] |
reduced χ2 | ||
|
|
|||||||
| observed | – | 0 | 15.28 | 0 | 13.00 | – | |
| model ωf = 0° | 0.06 | –11.71 | 15.26 | –6.11 | 13.10 | 2.17 | |
| model ωf = 40° | 0.10 | –10.81 | 15.31 | –7.01 | 13.30 | 2.31 | |
| model ωf = 55° | 0.13 | –11.18 | 15.35 | –7.15 | 13.05 | 2.21 | |
| model ωf = 75° | 0.30 | –14.50 | 10.55 | –7.39 | 12.70 | 2.26 | |
Notes. All models were simultaneously fitted to 18.1- and
24.5-μm brightness profile linecuts of 0.5′′ and share the
following parameter values: amin = 70 AU,
amax = 84 AU, γ = −1.5,
Dtyp = 2 μm, and
i = 14.1°. Also recall that the value
for the observations is 0 because we
defined the stellar position at 24.5 μm as the midpoint between the
brightness peaks of the two ansae (with the measured difference between the midpoint
and the stellar peak at 18.1 μm to be <1 pixel).
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