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Table 3
The parameters for the best-fit SHAPE model of MyCn 18.
| Parameter | Value |
|
|
|
| Pole-to-pole length (along its major axis) | 18′′ |
| Nebular waist (along its minor axis) | 1.8′′ |
| Max lobe width (along its minor axis) | 8.5′′ |
| Shell thickness | 0.2′′ |
| Inclination (w.r.t. plane of sky) | 52° |
| Systemic heliocentric radial velocity, Vsys | −71 km s-1 |
| Max velocity (outer hourglass) | 70 km s-1 |
| Max velocity (inner hourglass) | 30 km s-1 |
| Convolution (seeing) | 1.37′′ |
Notes. The parameters for the velocity of the inner and outer hourglass varied until the observed and synthetic P-V arrays resembled each other closely. The slit width used in the modelling is the same as that used for the observed data.
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