Table 4
Parameters of the central Mira star and molecular envelope of OH 231.8 used for the chemical kinetics models (Sect. 5.1).
| Parameter | Value | Reference |
|
|
||
| Distance (d) | 1500 pc | b |
| Stellar radius (R∗) | 4.4 × 1013 cm | g |
| Stellar effective temperature (T∗) | 2300 K | g |
| Stellar luminosity (L∗) | 104 L⊙ | g |
| Stellar mass (M∗) | 1 M⊙ | g |
| Model a : slow, core | ||
| AGB CSE expansion velocity (Vexp) | 20 km s-1 | a, e, f, g, i |
| AGB mass loss rate (Ṁ) | 10-4 M⊙ yr-1 | e, a, f |
| Kinetic temperature (Tkin) | T∗(r/R∗)-0.70 K | i |
| Model b : lobe walls | ||
| Wall thickness | 1′′ | a |
| H2 number density (nH2) | 105 cm-3 | a |
| Kinetic temperature (Tkin) | 20 K | a |
Reference. a) Alcolea et al. (2001); b) Choi et al. (2012); c) Cohen (1981); d) Kastner et al. (1992); e) Morris et al. (1987); f) Sánchez Contreras et al. (1997); g) Sánchez Contreras et al. (2002); h) Sánchez Contreras et al. (2004); i) Velilla Prieto et al. (2015).
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