PHOTOIONIZATION MODELS OF LUMINESCENCE AND PHYSICAL CHARACTERISTICS OF PLANETARY-NEBULAE - BD+30-DEGREES-3639 AND NGC-7293

The modern photoionization model of luminescence of planetary nebulae is described. All the processes which play a dominant role in the establishment of ionization - recombination equilibrium of nebulae gas are taken into account. The diffuse ionized radiation is more correctly accounted for. The intensities of emission lines of basic chemical elements whose lines are observed in the UV, optical and IR spectral ranges are calculated. The application of this model is illustrated on the example of the planetary nebulae BD+30-degrees-3636 and NGC 7293. The radial distribution of N(e), T(e), n(H) and other parameters in the nebulae is found. For the first time the continuum of the central stars beyond lambda less-than-or-equal-to 912 angstrom is found. It is shown that it does not correspond to the blackbody spectrum but agrees well with the corresponding spectrum of central-star non-LTE model atmospheres. This spectrum fits very smoothly to the continuum of the stars in the UV and optical ranges. The optical thickness of these nebulae at the frequencies of the Lyman continuum is derived. The abundances of elements in the nebulae are determined more precisely.