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Table 4
Parameter symbols, nominal values, and scalings in HD 34078 and its bow shock.
| Definition | Symbol | Eq. | Nominal value | Scaling | Reference |
|
|
|||||
| Distance | D | 530 pc | (1) | ||
| Spectral type | – | O9.5 | (2) | ||
| Stellar mass | M ⋆ | 20 M⊙ | (2) | ||
| Stellar luminosity | L ⋆ | 8 × 104L⊙ | ∝ D 2 | (1) | |
| Stellar velocity | V ⋆ |
|
∝ D | (3) | |
| Wind velocity | V wind | 800 km s-1 | (2) | ||
| Wind mass-loss rate (from UV) | Ṁ | 3 × 10-10M⊙ yr-1 | (2) | ||
|
|
|||||
| Strömgren radius | R St | (3) | 4.3 pc | ∝ D | (4) |
| Ambient density | n a | (3) | 20 cm-3 | ∝ D 3/2 | (4) |
| Wind ram pressure | P wind | (4) | 2 300 K cm-3 at R = 0.2 pc | ∝ Ṁ V wind R -2 | (4) |
| Radiation pressure | P rad | (8) | 1.5 × 107 K cm-3 at R = 0.2 pc |
∝
D
|
(4) |
| Globulette thermal pressure | P therm | (5) | ~ 106−107 K cm-3 | ∝ D -1 T | (4) |
|
|
|||||
| Star-apex distance (Observed) | R obs | 0.04 pc | ∝ D | (4) | |
| Star-apex distance (Deprojected) | R apex | 0.035 pc | ∝ D | (4) | |
| Wind standoff radius | R wind | (7) | 0.0012 pc | ∝ (ṀVwind)1 / 2D− 7 / 4 | (4) |
| Dust avoidance radius ( no gas drag) | R av | (10) | 0.05−0.7 pc | ∝ D 0 | (4) |
| Gas+grain avoidance radius (opt. thin) | R rad | (12) |
|
∝ D 0 | (4) |
| Gas+grain avoidance radius (opt. thick) |
|
(13) | 0.10 pc | ∝ D −3/4 | (4) |
Notes. References: (1) Herbig (1999); (2) Martins et al. (2005); (3) Tetzlaff et al. (2011); (4) this work.
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