Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-03-09
Astron.Astrophys.346:345,1999
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures, LaTeX using aa.cls and epsf.sty. Corrected typos in Eq.(16) (v2) and in Eq.(A3) (v3)
Scientific paper
New calculations of the thermal and electrical electron conductivities are performed for a broad range of physical parameters typical for envelopes of neutron stars and cores of white dwarfs. We consider stellar matter composed of astrophysically important chemical elements from H to Fe in the density range from 10^2-10^4 g/ccm up to 10^7-10^{10} g/ccm, where atoms are fully ionized and electrons are strongly degenerate. We have used modified ion structure factors suggested in physics/9811052. In the ion liquid, these modifications take into account, in an approximate way, instantaneous electron-band structures that reduce the electron-ion scattering rate. In crystallized matter, the new structure factors include multi-phonon processes important at temperatures not very much lower than the melting temperature T_m. The transport coefficients obtained differ significantly from those derived earlier in the important temperature range T_m/5 < T < 5 T_m. The results of our numerical calculations are fitted by analytical expressions convenient for astrophysical applications.
Baiko D. A.
Haensel Pawel
Potekhin Alexander Y.
Yakovlev Dmitry G.
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