2007

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

Medin, Zach, Lai, Dong, Potekhin, Alexander Y.

Understand

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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