Table 4
Circumstellar geometries with a different set of components.
| Geometry | Ks-band total linear polarization degree  [%] |
(Ks − L′)int (intrinsic) | (Ks − L′)ext = (Ks − L′)int + (AK − AL) (with extinction) |
|
|
|||
| Star | 0 (~6% foreground pol. at Gal. Ctr.) | − 0.9 | 0.4 |
| Star+rotationally flattened envelope (90° inclination) | 2.7 | 1.6 | 2.9 |
| Star+flared disc | 3.2 | 0.3 | 1.6 |
| Star+dense bow shock (inclined) | 4.1 | 1.9 | 3.2 |
| Star+spherical dusty envelope+dense bow shock (inclined) | 1.0 | 1.6 | 2.9 |
| Star+flattened envelope+cavities (90% inclination) | 10.1 | 1.2 | 2.4 |
| Star+flared disc+flattened envelope+cavities (90% inclination) | 10.5 | − 1.3 | − 0.03 |
|
|
|||
| Star+envelope+cavities+dense bow shock | 23.0 | 1.6 | 2.9 |
|
|
|||
| Observations (Shahzamanian et al. 2016) | ~ 30 | 1.8 | 3.1 |
Notes. Important parameters are the total linear polarization degree in Ks band (2.2 μm) and the colour index Ks − L′ (with and without line-of-sight extinction). The observed values for the polarization degree and the colour index are also included. The observed values of the polarization degree and the colour index are matched best by the composite model star+disc+cavities+dense bow shock.
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