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Journal of Physical Studies 15(4), Article 4901 [15 pages] (2011)
DOI: https://doi.org/10.30970/jps.15.4901 DETERMINATION OF ENERGY DISTRIBUTION IN IONIZING RADIATION SPECTRUM OF ORION NEBULAB. Ya. Melekh, R. I. Korytko, V. V. Holovatyi
Ivan Franko National University of Lviv, Department for
Astrophysics, |
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The electron densities $n_e$ and temperatures $T_e$ as well as ionic abundances were determined using the nebular gas diagnostic method DIAGN on the basis of the observed spectra obtained from 12 different slit positions on Orion Nebula. For this purpose the modern data on the probabilities of relevant atomic processes were used. All the observed data were taken from paper [M. Peimbert, S. Torres-Peimbert, Mon. Not. R. Astron. Soc. \textbf{179}, 217 (1977)]. For each observed part of the Orion Nebula the energy distribution in the ionizing spectrum beyond ${\rm λ\leq912\,\textup{\AA}}$ (the so-called ${\rm Lyc}$-spectrum) was determined using the NLEHII method. The resulting ${\rm Lyc}$-spectra with other data were used to calculate the optimized photoionization models (OPhMs) for the observed parts of the Orion Nebula. The dust abundance was also taken into account. The two types of the OPhMs were calculated. The first one is ionizing bounded OPhMs, and the second one is OPhMs with gas-dust cocoon. As a result, a new ${\rm Lyc}$-spectra were obtained. In the future, they will be used (along with other individually found OPhM characteristics) to calculate the grid models and to correct the output of new expressions for ionization-correction factors in high-metalicity H{\sc ii} zones.
PACS number(s): 98.58.Hf, 98.52.Nr, 07.05.Tp