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Table 1
Physical conditions in the molecule-rich nebula, derived from our model fitting of the CO data, and assuming D = 1100 pc.
| Inner disk | Outer disk | Outflow | ||||
|---|---|---|---|---|---|---|
| (pure Keplerian rotation) | (subkeplerian rotation plus slow expansion) | |||||
| Parameter | Law | Values | Law | Values | Law | Values |
| Radius | r < Ri | Ri = 6 × 1015 cm | r < Ro | Ro = 2 × 1016 cm | p < Rof | Rof = 2.5 × 1016 cm |
| (see Figs. 6, 7) | ||||||
| Total width | h < Hi | Hi = 2.8 × 1015 cm | h < Ho | Ho = 4 × 1015 cm | h < Hof | Hof = 3.4 × 1016 cm |
| (see Figs. 6, 7) | ||||||
| Temperature | T =  |
To = 36 K | T =  |
To = 27 K | T =  |
To = 50 K |
| αT = 0.4 | αT = 1 | αT = 0.7 | ||||
| Density | n =  |
no = 3.7 × 106 cm−3 | n =  |
n(1016cm) = 9 × 105 cm−3 | n =  |
no = 8.5 × 104 cm−3 |
| αn = 1 | αn = 1 | αn = 2.3 | ||||
| Local velocity | constant | 0.1 km s−1 | constant | 0.1 km s−1 | constant | 2 km s−1 |
| dispersion | ||||||
| Other parameters | Law | Values | comments | |||
| Axis inclination with respect to the plane of the sky | 70° | from IR and CO data | ||||
| Axis inclination in the plane of the sky (PA) | −15° | from IR and CO data | ||||
| Distance | 1100 pc | various arguments (Sect. 1) | ||||
| 12CO relative abundance | constant | 1.5 × 10−4 | this paper | |||
| 13CO relative abundance | constant | 1.5 × 10−5 | this paper | |||
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