Equilibrium temperature degeneracy in an optically thin gas. The attenuation factor is set at 6.3 × 10-2, which corresponds to r ≈ 127 R∗. Each panel refers to a different density. Left panel: 10-10g cm-3, right panel: 10-12g cm-3. Each curve corresponds to a different opacity data source: the thickest line – this work, using κP(Tgas,Trad); the intermediate-thick line – this work, using κ(Trad) instead of κP(Tgas,Trad); the thinnest line – Helling et al. (2000), using κ(Trad). The dashed parts of the lines mark unstable solutions (see text).
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