Deep crustal heating for realistic compositions of thermonuclear ashes

The deep crustal heating, associated with exothermal nuclear reactions, is believed to be a key parameter for describing the thermal evolution of accreting neutron stars. In this paper, we present first thermodynamically consistent calculations heating realistic compositions thermonuclear ashes. contrast previous studies based on traditional approach, account hydrostatic/diffusion (nHD) equilibrium condition imposed by superfluidity neutrons in major part inner crust and rapid diffusion remaining crust. We apply simplified reaction network model various multi-component burning ashes (superburst, KEPLER, extreme rp-process ashes) outer calculate energy release Q, parametrized pressure at outer-inner interface, P_{oi}. Using general thermodynamic arguments, set lower limit Q>0.13-0.2 MeV per baryon (an actual value depends ash composition employed mass model).