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New Ionization-Correction Factors for the Chemical Composition Determination of Galactic Planetary Nebulae and HII Regions in Blue Compact Dwarf Galaxies

Published online by Cambridge University Press:  26 May 2016

V.V. Holovatyy ,
N.V. Havrylova  and
B.Ya. Melekh
V.V. Holovatyy
Affiliation:
Astromical Observatory of Lviv National University, Ukraine
N.V. Havrylova
Affiliation:
Astromical Observatory of Lviv National University, Ukraine
B.Ya. Melekh
Affiliation:
Astromical Observatory of Lviv National University, Ukraine

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The photoionization models (PhM) grid of the planetary nebulae (PN) and the HII regions in the blue compact dwarf galaxies (BCDG) was calculated. For grids modeling we used the CLOUDY94 code (Ferland G.J. 1999). Free parameters for PN grid were: (1) energy distribution, that corresponds to temperature of each of 15 chosen models (Clegg & Middlemass 1987); (2) chemical composition of nebular gas in models; (3) filling factor with its values, for every model, being equal to 0.1, 0.5 and 1. For HII regions the free parameters were: (1) energy distribution in the spectra of nuclei emission obtained for HII regions in BCDG by our method (Golovaty 1987, Melekh 2000) from high-quality observations (Izotov, Thuan, & Lipovetsky 1994, Izotov, Thuan, & Lipovetsky 1997, Thuan, Izotov, & Lipovetsky hys. J. 1995) of these objects (the method uses stellar atmosphere models of O-B stars (Schaerer et al. 1996, Schaerer & de Koter 1997)); (2) nebular gas filling factor with the values ranging from 0.0001 to 1; (3) the relative abundance of heavy elements; (4) the concentration of hydrogen atoms nH. All PhM were assumed to be spherically-symmetrical. As a result, 135 PN PhM and 270 HII regions PhM were calculated.

Type
Part VIII: Planetary Nebulae as Galaxy Probes
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 563 - 564
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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