Table 3
Comparison between the flow parameters derived from CO (2 − 1) and H2O.
| Method 1a (i = 80°) | Method 2b (i = 75°) | ||||
|
|
|
||||
| Parameterc | Symbol and unit | CO (2 − 1) | H2O (red) | H2O (red) | |
|
|
|||||
| Length to width ratio | Rcoll | 14 | 7.5 | 7.5 | |
| Total mass | Mtot (M⊙) | 10 × 10-3 | 1.6 × 10-3 | 1.6 × 10-3 | |
| Extent | Rmax (pc) | 0.08 | 0.09 | 0.09 | |
| Characteristic velocity | υchar (km s-1) | 50  |
90  |
60 |
|
| Dynamical time scale | td (yr) | 1.7  × 103 |
1.0  × 103 |
7.4  × 102 |
|
| Momentum | P (M⊙ km s-1) | 0.6  |
0.1  |
0.03 | |
| Kinetic energy | E (erg) | 3  × 1044 |
1  × 1044 |
2.0 × 1043 | |
| Momentum rate | Ṗ (M⊙ km s-1 yr-1) | 3.4  × 10-4 |
1.5  × 10-4 |
3.4  × 10-5 |
|
| Mechanical luminosity | Ė (L⊙) | 1.4  |
1.1  |
0.2  |
|
| Wind mass-loss rate | Ṁ (M⊙ yr-1) | 1.7  × 10-6 |
0.7  × 10-6 |
1.7  × 10-7 |
|
Notes. The uncertainty on the inclination is assumed to be 5° and the velocity of the wind is set to 200 km s-1.
The parameters derived from CO (2−1) were presented in André et al. (1990) and have here been scaled to the distance 120 pc.
The inclination corrections are based on the work presented in Downes & Cabrit (2007). The dynamical time-scale is derived from the maximum velocity of the H2O gas, i.e. ~30 km s-1.
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