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There is observational evidence that central compact objects (CCOs) insupernova remnants have moderately strong magnetic fields $B\sim10^{11}$ G.Meanwhile, available models of partially ionized hydrogen atmospheres ofneutron stars with strong magnetic fields are restricted to $B\gtrsim10^{12}$G. We extend the equation of state and radiative opacities, presented inprevious papers for $10^{12}\mbox{ G}\lesssim B \lesssim 10^{15}$ G, to weakerfields. An equation of state and radiative opacities for a partially ionizedhydrogen plasma are obtained at magnetic fields $B$, temperatures $T$, anddensities $\rho$ typical for atmospheres of CCOs and other isolated neutronstars with moderately strong magnetic fields. The first- and second-orderthermodynamic functions, monochromatic radiative opacities, and Rosseland meanopacities are calculated and tabulated, taking account of partial ionization,for $3\times10^{10}\mbox{ G}\lesssim B\lesssim 10^{12}$ G, $10^5$ K $\lesssimT\lesssim 10^7$ K, and a wide range of densities. Atmosphere models and spectraare calculated to verify the applicability of the results and to determine therange of magnetic fields and effective temperatures where the incompleteionization of the hydrogen plasma is important.

Opacities and spectra of hydrogen atmospheres of moderately magnetized neutron stars