Journal Article

Atomic data and electron-impact broadening effect in DO white dwarf atmospheres: Si <span class="smallCaps">vi</span>

R. Hamdi, N. Ben Nessib, N. Milovanović, L.Č. Popović, M. S. Dimitrijević and S. Sahal-Bréchot

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 387, issue 2, pages 871-882
Published in print June 2008 | ISSN: 0035-8711
Published online May 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13284.x
Atomic data and electron-impact broadening effect in DO white dwarf atmospheres: Si vi

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Energy levels, electric dipole transition probabilities and oscillator strengths in five times ionized silicon have been calculated in intermediate coupling. The present calculations were carried out with the general purpose atomic structure program superstructure. The relativistic corrections to the non-relativistic Hamiltonian are taken into account through the Breit–Pauli approximation. We have also introduced a semi-empirical correction [term energy corrections (TEC)] for the calculation of the energy levels. These atomic data are used to provide semiclassical electron-, proton- and ionized helium-impact linewidths and shifts for 15 Si vi multiplet. Calculated results have been used to consider the influence of Stark broadening for DO white dwarf atmospheric conditions.

Keywords: atomic data; atomic processes; line: formation; stars: atmospheres; white dwarfs

Journal Article.  4327 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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