EMISSION-SPECTRUM OF A HOT HIGH-DENSITY H YDROGEN-HELIUM PLASMA

On the basis of escape-probability method of V. V. Sobolev for the cas e of collisional excitation and ionization, calculations of the emissi on spectra of hydrogen and helium plasma with cosmic H/He abundance ha ve been made for high temperatures (T(e) = 40 000-100 000 K) and densi ties (N(e) = 10(11) = 10(14) cm-3). It is shown that the energy emitte d in hydrogen lines is comparable with that of ionized-helium lines. I t turns out also that for a hot hydrogen plasma with tau(Lc) > 1 all s ubordinate lines of hydrogen are optically thick simultaneously (tau > 100), although al low temperatures (T(e) = 10 000-20 000 K) the optic al depths of subordinate lines increase gradually.