Radiative transitions of the helium atom in highly magnetized neutron star atmospheres
Corresponding Author
Z. Medin
Centre for Radiophysics and Space Research, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
E-mail: [email protected]Search for more papers by this authorD. Lai
Centre for Radiophysics and Space Research, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Search for more papers by this authorA. Y. Potekhin
Centre for Radiophysics and Space Research, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Ioffe Physico-Technical Institute, Politekhnicheskaya 26, 194021 Saint-Petersburg, Russia
Search for more papers by this authorCorresponding Author
Z. Medin
Centre for Radiophysics and Space Research, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
E-mail: [email protected]Search for more papers by this authorD. Lai
Centre for Radiophysics and Space Research, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Search for more papers by this authorA. Y. Potekhin
Centre for Radiophysics and Space Research, Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Ioffe Physico-Technical Institute, Politekhnicheskaya 26, 194021 Saint-Petersburg, Russia
Search for more papers by this authorABSTRACT
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 1012 to 1014 G. Convenient fitting formulae for the cross-sections are given along with the 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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