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Preprint 16a/04

Atomic Data for the Atmospheres of Strongly Magnetized Neutron Stars

Matthias Klews (1), Günter Wunner (2), Klaus Werner (1)

(1) Institut für Astronomie uud Astrophysik. Univ. Tübingen, Sand 1, D-72076 Tübingen, Germany
(2) Institut für Theoretische Physik 1, Universität Stuttgart, D-70550 Stuttgart, Germany

To be published in: X-ray Diagnostics for Astrophysical Plasmas, American Institute of Physics Conference Proceedings

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 multi-configuration Hartree-Fock approach based on finite-element and B-spline techniques. It turns out that typically 15 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 6^th order, with parallelization speed-ups of 20 on a 26-processor machine. Results have been obtained for the energies of the ground states and excited levels and for the transition strengths of astrophysically relevant atoms and ions in the range Z=2...26 in different ionization stages.
 
Key words: neutron stars, magnetic fields, atomic data, synthetic spectra

Preprint (35 kb PDF file including figures)

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