Other
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ign..confe..40o&link_type=abstract
Ionized Gaseous Nebulae. Mexico City November 21- 24, 2000, meeting abstract
Other
Scientific paper
Nebular emission-line ratios are vital diagnostics of ionizing stellar populations and metallicities in distant galaxies. However, we rely heavily on photoionization models to interpret observed nebular emission-line ratios; empirical calibrations using ordinary H II regions with known properties have been lacking. Here we present such empirical calibrations and evaluate nebular diagnostics, based on detailed observations of H II regions by ourselves and others. We examine diagnostics for stellar effective temperature T*, namely the radiation softness parameter η' and our suggested [Ne III]λ3869/Hβ. We also reexamine nebular abundance determinations; we evaluate and calibrate the S23 and S234 sulfur abundance paramters.
Dopita Mike A.
Oey Sally M.
Shields Joseph C.
Smith Christopher R.
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