Fig. 4

Effect of the inner boundary condition of the radiation transfer equation on emergent spectrum (top panel) and temperature structure (bottom panel) of a thin partially ionized hydrogen atmosphere (Teff = 1.2 × 106 K, B = 1014 G) with Σ = 10 g cm-2, above the condensed iron surface (solid curves) and black-body surface (dashed curves). For comparison, the black-body spectrum with T = Teff (dotted curve) and the diluted black-body spectrum (fc = 1.6, D = 1.4-4), with a Gaussian line representing the proton cyclotron line (E1 = 0.63 keV, τ1 = 8.5, σ1 = 11 eV), and a half-Gaussian line (E2 = 0.3 keV, τ1 = 2.5, σ1 = 150 eV) describing the absorption feature at energies higher than Ec,i (dash-dotted curve) are shown. That last curve fits the spectrum of the atmosphere above the condensed iron surface.
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