Electronic Structure and Radiative Opacity of the Metallic Elements in Hot and Dense Stellar Material

Details Electronic Structure and Radiative Opacity of the Metallic Elements in Hot and Dense Stellar Material Electronic Structure and Radiative Opacity of the Metallic Elements in Hot and Dense Stellar Material

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...600..963w&link_type=abstract

The Astrophysical Journal, Volume 600, Issue 2, pp. 963-971.

Astronomy and Astrophysics

Astronomy

1

Atomic Processes, Radiative Transfer, Stars: Interiors

Scientific paper

Electronic structures of the metallic elements in hot and dense stellar material are calculated with an average-atom scheme, which is designed to consider the environmental influence in a mixture. It ensures that all kinds of atoms have the same temperature, the same chemical potential, and the same electron density at the boundaries between the atoms, and that the electrical neutrality within each atomic sphere is satisfied by using a self-consistent field calculation. Opacities, which are strongly environmentally dependent, for stellar materials with solar composition and relative abundance have been calculated with the calculated electronic orbitals and excitation cross sections. Comparisons are made between the present opacity results and those of OPAL and LANL (Los Alamos National Laboratory Astrophysical Opacity Library) to show that the environmental influence on the electronic structures of the atoms and ions in a hot and dense mixed material has been adequately taken into account using a completely different method. Agreement is quite good for a variety of temperatures and densities. The results also show that the contributions from both bound-bound and bound-free radiative transition processes of the metallic elements are significant, although their relative abundance is much smaller than hydrogen and helium.

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