  The values of electrical conductivity of plasma of stars with a magnetic
field or moving in the magnetic field of the other component in a binary system
could be of significant interest, since they are useful for the study of
thermal evolution of such objects, cooling, nuclear burning of accreted matter,
and the investigation of their magnetic fields. So, on the basis of numerically
calculated values for the dense plasma conductivity in an external HF electric
field, we determine the HF characteristics of astrophysical plasmas under
extreme conditions. The examined range of frequencies covers the IR, visible
and near UV regions and consider electronic number density and temperature are
in the ranges of $10^{21} \textrm{cm}^{-3} \le Ne$ and 20 000 $\le T$,
respectively. The method developed here represents a powerful tool for research
into white dwarfs with different atmospheric compositions (DA, DC etc.), and
for investigation of some other stars (M-type red dwarfs, Sun etc.).
