Journal Article

Electrical conductivity of plasmas of DB white dwarf atmospheres

V. A. Srećković, Lj. M. Ignjatović, A. A. Mihajlov and M. S. Dimitrijević

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 1, pages 590-596
Published in print July 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16702.x
Electrical conductivity of plasmas of DB white dwarf atmospheres

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The static electrical conductivity of non-ideal, dense, partially ionized helium plasma was calculated over a wide range of plasma parameters: temperatures 1 × 104T≲ 1 × 105 K and mass density 1 × 10−6 g cm−3≲ρ≲ 2 g cm−3. Calculations of electrical conductivity of plasma for the considered range of plasma parameters are of interest for DB white dwarf atmospheres with effective temperatures 1 × 104 K ≲Teff≲ 3 × 104 K.

Electrical conductivity of plasma was calculated by using the modified random phase approximation and semiclassical method, adapted for the case of dense, partially ionized plasma. The results were compared with the unique existing experimental data, including the results related to the region of dense plasmas. In spite of low accuracy of the experimental data, the existing agreement with them indicates that results obtained in this paper are correct.

Keywords: stars: atmospheres; stars: kinematics and dynamics; white dwarfs

Journal Article.  3377 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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