Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 16: Atomic systems in external fields I

A 16.8: Talk

Wednesday, March 16, 2011, 15:45–16:00, BAR 106

Hartree-Fock calculations for the photoionization of atoms and ions from hydrogen to iron in neutron star magnetic fields — •Peter Diemand, Thorsten Kersting, Damir Zajec, and Günter Wunner — 1. Institut für theoretische Physik, Universität Stuttgart

We derive the photoionization cross section in dipole approximation for many-electron atoms and ions in neutron star magnetic field strengths. Continuum states are treated in adiabatic approximation in a self-consistent way. Bound states are calculated by solving the Hartree-Fock-Roothaan equations using finite-element and B-spline techniques. The data are of importance for the quantitative interpretation of observed X-ray spectra that originate from the thermal emission of isolated neutron stars. They can serve as input for modelling neutron star atmospheres as regards chemical composition, magnetic field strength, temperature, and redshift. We demonstrate example results for astrophysically relevant atoms and ions in the range Z=1,...26.