ELECTRON CONDUCTION ALONG QUANTIZING MAGNETIC-FIELDS IN NEUTRON-STAR CRUSTS .2. PRACTICAL FORMULAS

We derive practical expressions for a rapid and accurate evaluation of electric and thermal conductivities and thermopower of degenerate rel ativistic electrons along quantizing magnetic fields in outer neutron star crusts. We consider the electron Coulomb scattering on ions in li quid matter, as well as on high-temperature phonons or charged impurit ies in solid matter. We propose also a reasonable semi-quantitative tr eatment of low-temperature phonons. The transport properties are expre ssed through the energy dependent effective electron relaxation time a veraged over electron energies. We calculate this relaxation time, usi ng the theoretical formalism of the previous work, obtain accurate fit ting expressions, and propose an efficient energy averaging procedure. We create a computer code which calculates the longitudinal transport properties of degenerate electrons in strong magnetic fields for any parameters of dense stellar matter of practical interest. We analyse q uantum oscillations of the transport coefficients versus density at va rious temperatures and magnetic fields.