matter consists of an approximately equal mixture of up $u$, down $d$ and strange $s$ quarks, with a slight deficit of the latter. The Fermi gas of $3A$ quarks constitutes a single color-singlet baryon with baryon number $A$. This structure of the quarks leads to a net positive charge inside the star. Since stars in their lowest energy state are supposed to be charge neutral, electrons must balance the net positive quark charge in strange matter stars. The electrons, being bounded to the quark matter by the electromagnetic interaction and not by the strong force, are able to move freely across the quark surface, but clearly cannot move to infinity because of the electrostatic attraction of quarks. For hot stars the electron distribution could extend up to $\sim 10^{3}$ fm above the quark surface [@Ke95; @ChHa03; @Us05]. The electron distribution at the surface of the quark star is called electrosphere. The effect of the color-flavor locked phase of strange matter on the electric field in the electrosphere was discussed by @Us04.

Photon emissivity is the basic parameter for determining macroscopic properties of stellar type objects. @Al86 have shown that, because of very high plasma frequency near the strange matter edge, 