Radiative transitions of the helium atom in highly magnetized neutron star atmospheres

Details Radiative transitions of the helium atom in highly magnetized neutron star atmospheres Radiative transitions of the helium atom in highly magnetized neutron star atmospheres

2007-04-12

arxiv.org/abs/0704.1598v2

Mon.Not.Roy.Astron.Soc. 383 (2008) 161-172

Astronomy and Astrophysics

Astrophysics

14 pages, 7 figures. Minor changes. MNRAS in press

Scientific paper

10.1111/j.1365-2966.2007.12518.x

Recent observations of thermally emitting isolated neutron stars revealed spectral features that could be interpreted as radiative transitions of He in a magnetized neutron star atmosphere. We present Hartree-Fock calculations of the polarization-dependent photoionization cross sections of the He atom in strong magnetic fields ranging from 10^12 G to 10^14 G. Convenient fitting formulae for the cross sections are given as well as related oscillator strengths for various bound-bound transitions. The effects of finite nucleus mass on the radiative absorption cross sections are examined using perturbation theory.

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