Nonequilibrium thermodynamics of accreted neutron-star crust

We show that, in order to determine the equation of state inner crust an accreting neutron star, one should minimize not Gibbs free energy, as it is generally assumed literature, but a different thermodynamic potential $\mathrm{\ensuremath{\Psi}}$, which tends minimum at fixed pressure and chemical potential. Once this specified, can calculate heat-release distribution stellar due nonequilibrium nuclear reactions induced by accretion matter onto neutron-star surface. The results are important for adequate modeling accreted interpretation observations stars low-mass X-ray binaries.