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Journal of Physical Studies 11(4), 468–472 (2007)
DOI: https://doi.org/10.30970/jps.11.468 DETERMINATION OF THE PRIMORDIAL HELIUM ABUNDANCE Yp AND ITS ENRICHMENT dY/dZ ON THE BASIS OF CHEMICAL COMPOSITION OF THE HII REGION IN BLUE COMPACT GALAXIES AND PLANETARY NEBULAEV. V. Holovatyy, B. Ya. Melekh, N. V. Havrylova
Department for Astrophysics, Ivan Franko National University of Lviv, |
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The chemical compositions of H{\sc ii} regions in blue compact dwarf galaxies and planetary nebulae obtained using new ionization-correction factors and optimized photoionization models of the nebular gas were used for the determination of the primordial helium abundance $Y_p$ and its enrichment $dY/dZ$ values. It was found that a simultaneous use of the chemical composition of H{\sc ii} regions in the blue compact dwarf galaxies and planetary nebulae increases the accuracy of $Y_p$ and $dY/dZ$ determination.
PACS number(s): 98.58.Hf, 98.52.Wz, 98.54.Ep, 98.56.Wm, 97.10.Ex