Table 1
Structure and physical conditions in the molecular disk in the Red Rectangle derived from our model fitting of the CO data.
| Inner disk (r<Rkep) | Outer disk (r>Rkep) | Outflow | ||||
| Parameter | Law | Values | Law | Values | Law | Values |
|
|
||||||
| Outer radius | Rkep = 106 cm | Rout = 2.3 × 1016 cm | ||||
|
|
||||||
| Thickness | linear | H(Rkep) = 1.3 × 1016cm | constant | H = 1.3 × 1016 cm | ellipsoidal | |
| H(0) = 6.5 × 1015 cm | (see Fig. 8) | |||||
|
|
||||||
| Tangential | Vt ∝ 1/ |
Vt(Rkep) = 1.5 km s-1 | Vt ∝ 1 /r | Vt(Rkep) = 1.5 km s-1 | ||
| velocity | (Keplerian) | (central mass: 1.7 M⊙) | (ang. mom. cons.) | |||
|
|
||||||
| Expansion | 0 km s-1 |
|
Vexp(Rkep) = 1.6 km s-1 |
|
| Vmax | = 12 km s-1 | |
| velocity | Vexp(Rout) = 0 km s-1 | |||||
|
|
||||||
| Temperature | T ∝ 1 /rαT | T(Rkep) = 80 K | T ∝ 1 /rαT | T(Rkep) = 95 K |
|
Tmax = 500 K |
| αT = 1 | αT = 0.6 | αT = 1 | ||||
|
|
||||||
| Gas density | n ∝ 1 /rαn | n(Rkep) = 7 × 105 cm-3 | n ∝ 1 /rαn | n(Rkep) = 2 × 105 cm-3 |
|
n(Rkep) = 1.6 × 104 cm-3 |
| αn = 2 | αn = 1.5 | αn = 2 | ||||
| Other parameters | Law | Values | Comments |
|
|
|||
| Axis inclination from the plane of the sky | 5° | from optical and CO data | |
|
|
|||
| Axis inclination in the plane of the sky (PA) | 12.°5 | from optical and CO data | |
|
|
|||
| Distance | 710 pc | various arguments (Sect. 1) | |
|
|
|||
| 12CO relative abundance | constant | 1.2 × 10-4 | this paper |
| 13CO relative abundance | constant | 1.2 × 10-5 | this paper |
| C17O relative abundance | constant | 6 × 10-7 | this paper |
Notes. The fitting of the H13CN line requires the same structure and velocity field but with a peculiar abundance distribution; see Sect. 5.3. The values of the physical conditions depend on three geometrical parameters: the distance to the center, r, the distance to the inner conical boundary of the outflow, pc, and the distance to the equator, h. See Fig. 8 for a scheme of the density and velocity distribution.
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