Highlights of Spanish Astrophysics II pp 117-120 | Cite as
Study of Chemical Abundances and Ionizing Populations in Extragalactic HII Regions
Abstract
Long-slit spectrophotometric observations in the optical and near infrared of 14 HII regions in different spiral galaxies (NGC 628, NGC 925, NGC 1232 and NGC 1637) are presented. The main motivation of this work is the search of relatively high excitation (log[OIII]/Hβ≥0.0)-high metallicity (Z≥Z⊙) HII regions as predicted on theoretical grounds, due to the appearance of massive Wolf-Rayet stars that would change the ionisation structure of these regions. Therefore, we have chosen reported high metallicity HII regions that fit our selection criteria from the observed HII region sample of Van Zee et al. (1998). Both the chemical composition of the gas and the ionizing populations responsible of the excitation mechanism are analysed in order to constrain the physical conditions inside these regions.
Keywords
Line Intensity Equivalent Width Spiral Galaxy Abundance Ratio Oxygen AbundancePreview
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