Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005arep...49..595h&link_type=abstract
Astronomy Reports, vol. 49, Issue 8, p.595-603
Astronomy and Astrophysics
Astronomy
Scientific paper
Optimized photoionization models of selected HII regions in Blue Compact Dwarf Galaxies are calculated with the aim of determining their chemical composition. The stability of the optimized-photoionization calculations and means of deriving the most accurate chemical abundances are checked. Initialization of the free physical parameters using different data sets, deviations from spherical geometry, and the introduction of gas-density fluctuations in an HII region do not affect the accuracy of the derived chemical compositions. The chemical abundances found for 12 HII regions using the optimized-photoionization models are used to derive the primordial helium abundance Y p and its enrichment dY/dZ. The obtained values of Y p and dY/dZ are close to values found previously using ionization-correction factors.
Holovatyi V. V.
Melekh Bohdan Ya.
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