Fig. 1.
Schematic depiction of the model describing the accretion at low Ṁ onto the polar cap of a magnetized neutron star. The polar cap is an emitting layer of an atmosphere with the total column density ymax (corresponding to the total geometrical depth zmax ∼ 10 m) and radius r0. The characteristic stopping length is denoted z0 (geometrical scale) and y0 (column density scale).
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