Abstract:We study hydrogen plasmas at magnetic fields B ∼ 10 12 − 10 13 G, densities ρ ∼ 10 −3 − 10 3 g cm −3 and temperatures T ∼ 10 5.5 −10 6.5 K, typical of photospheres of middle-aged cooling neutron stars. We construct an analytical free energy model of the partially ionized plasma, including into consideration the decentred atomic states, which arise due to the thermal motion across the strong field. We show that these states, neglected in previous studies, may contribute appreciably into thermodynamics of the ou… Show more
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