Table 6
Parameters of the Cloudy model of NGC 650.
| Parameter | Value | Parameter | Value | Rel. to solar |
|
|
||||
| Teff (kK) | 208. | ϵ(He) | 11.04 | +0.11 |
| L∗ (L⊙) | 261. | ϵ(C) | 8.94 | +0.51 |
| rin (mpc) | 93. | ϵ(N) | 8.20 | +0.37 |
| rout (mpc) | 274. | ϵ(O) | 8.62 | −0.07 |
| log(nH) (cm-3) | 2.14 | ϵ(Ne) | 7.97 | +0.04 |
| Te (kK) | 12.13 | ϵ(Mg) | 6.60: | −1.00: |
| log(ne) (cm-3) | 2.17 | ϵ(Si) | 6.56 | −0.95 |
| log(Γ) | −2.22 | ϵ(P) | 5.41: | +0.00: |
| m V | 18.04 | ϵ(S) | 6.79 | −0.33 |
| D (pc) | 1200. | ϵ(Cl) | 4.92 | −0.58 |
| χ 2 | 5.15 | ϵ(Ar) | 6.37 | −0.03 |
Notes. Teff and L∗ are the stellar temperature and luminosity, rin and rout the inner and outer radius of the nebula, nH is the hydrogen number density in the gas, Te and ne are the average electron temperature and density in the nebula, Γ is the dust-to-gas mass ratio, mV is the unreddened V-band magnitude of the central star, D is the distance, and ϵ is the elemental abundance by number relative to ϵ(H) ≡ 12. Elemental abundances derived from only a single observed line are marked as uncertain with colons. Solar abundances were taken from Grevesse et al. (2010).
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