Table 3
Parameters of our NH3 models.
| Target | d | R⋆ | T⋆ | Vsys | Vexp | bDopp | Rin | Re | f0 |
|---|---|---|---|---|---|---|---|---|---|
| (pc) | (AU, mas) | (K) | (km s−1) | (km s−1) | (km s−1) | (R ⋆) | (R⋆, arcsec) | (nNH3∕nH2) | |
| IK Tau | 265a | 1.00, 3.8a | 2200a | 34b | 17.7a | 4.0 | 75 | 600, 2.″3 | 6 × 10−7 |
| VY CMa | 1140c | 6.60, 5.8d | 3490d | 22e | 35f | 7.5 | 60 | 350, 2.″0 | 7 × 10−7 |
| OH 231.8+4.2 | 1540g | 2.93, 1.9h | 2300i | 34j | —k | 1.0 | 20 | 2100, 4″ | 5 × 10−7 |
| IRC +10420 | 5000l | 1.75, 0.35m | 8250n | 75p | 37p | 1.8 | 955 | ~20 000, 7″–8″ | ≳2.5 × 10−7 |
Notes. The columns are (from left to right): target, distance (d; pc), stellar radius (R⋆ ; AU or mas), stellar temperature(T⋆; K), systemic velocity in LSR (V sys; km s−1), terminal expansion velocity (Vexp; km s−1), Doppler-b parameter (bDopp; km s−1), inner radius of NH3 distribution (Rin; R⋆ ), e-folding radius of NH3 (R e ; R⋆ or arcsec), and the peak NH3 abundance (f0; relative to H2).
References. (a) Decin et al. (2010b). (b) Velilla Prieto et al. (2017). (c) Choi et al. (2008). (d) Wittkowski et al. (2012). (e) Alcolea et al. (2013). (f) Decin et al. (2006). (g) Choi et al. (2012). (h) From Stefan-Boltzmann law (Sect. 5.3). (i) Sánchez Contreras et al. (2002). (j) Sánchez Contreras et al. (2015); Velilla Prieto et al. (2015). (k) Equation (13). (l) Jones et al. (1993). (m) Oudmaijer & de Wit (2013). (n) Shenoy et al. (2016). (p) Castro-Carrizo et al. (2007).
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