# A fast parallel code for calculating energies and oscillator strengths of many-electron atoms at neutron star magnetic field strengths in adiabatic approximation

## Description

Abstract We have developed a new method for the fast computation of wavelengths and oscillator strengths for medium-Z atoms and ions, up to iron, at neutron star magnetic field strengths. The method is a parallelized Hartree-Fock approach in adiabatic approximation based on finite-element and B-spline techniques. It turns out that typically 15-20 finite elements are sufficient to calculate energies to within a relative accuracy of 10^(-5)in 4 or 5 iteration steps using B-splines of 6th order, with ... Title of program: HFFEM Catalogue Id: AECC_v1_0 Nature of problem Calculations of synthetic spectra [1] of strongly magnetized neutron stars are bedevilled by the lack of data for atoms in intense magnetic fields. While the behaviour of hydrogen and helium has been investigated in detail (see, e.g., [2]), complete and reliable data for heavier elements, in particular iron, are still missing. Since neutron stars are formed by the collapse of the iron cores of massive stars, it may be assumed that their atmospheres contain an iron plasma. Our objective is to fil ... Versions of this program held in the CPC repository in Mendeley Data AECC_v1_0; HFFEM; 10.1016/j.cpc.2008.09.008 AECC_v2_0; HFFERII; 10.1016/j.cpc.2012.02.011 AECC_v2_1; HFFERII; 10.1016/j.cpc.2014.02.007 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)