Open Access
Table 2
General parameters of the model of HL Tau and its circumstellar material. See Sects. 4.1 to 4.3 for details.
Parameter | Value |
---|---|
Stellar parameters | |
Stellar luminosity | 11 L⊙ |
Effective temperature | 4000 K |
Stellar radius | 6.9 R⊙ |
Disk parameters | |
Inclination | 46.7° |
Position angle | 138° |
Reference disk density ![]() |
7.2 × 10−14 g cm−3 |
Characteristic disk radius Rc | 100 au |
Reference scale height h0 | 15 au |
Radial disk profile α | 0.95 |
Disk flaring β | 1.15 |
Inner radius | 0.4 au |
Resulting disk gas mass | 0.13 M⊙ |
Envelope parameters | |
Reference envelope density ![]() |
2.4 × 10−18 g cm−3 |
Reference envelope radius Re | 1000 au |
Radial envelope profile γ | 0.65 |
Outer radius | 104 au |
Resulting envelope gas mass Menv | 0.016 M⊙ |
Magnetic field strength | 1 mG |
Inner magnetic field radius | 100 au |
Magnetic field position angle | 25° |
Dust parameters | |
Minimum grain size | 0.01 μm |
Maximum grain size amax (disk) | 35 μm |
Distribution exponent q (disk) | 3.5 |
Maximum grain size amax (envelope) | 1 μm |
Distribution exponent q (envelope) | 4.0 |
Axis ratio of spheroids | 2/3 |
Gas-to-dust mass ratio | 100 |
Reference RAT efficiency Q0 | 0.4 |
RAT efficiency exponent η | 3 |
Rayleigh reduction factor | 0.3 |
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