Computer Science – Performance
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12...77o&link_type=abstract
Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City
Computer Science
Performance
2
Galaxies: Abundances, H Ii Regions, Magellanic Clouds, Stars: Fundamental Parameters, Supernova Remnants
Scientific paper
We obtained nebular spectroscopy of LMC H II regions having classified stellar populations, thereby strongly constraining the ionization input parameters. Using photoionization models, we then evaluate the performance of nebular diagnostics of T[ scriptstyle star ]and abundance. We introduce [Ne III]/H beta as a nebular diagnostic of the ionizing stellar T[ scriptstyle star ]. In contrast to the widely-used ensuremath {eta ^prime } parameter, [Ne III]/H beta has greater sensitivity to mid and early O-stars, and is robust to nebular morphology and the presence of shocks. We present a preliminary calibration of both T[ scriptstyle star ]diagnostics for LMC metallicity. We also introduce S[234] equiv ([S II] + [S III] + [S IV])/H beta as a diagnostic of S abundance. S[234] is much less sensitive to the nebular ionization parameter than is S[23] or R[23]. The intensity of [S IV]10.5 mu m is easily estimated from the optical and near-IR line ratios. We present calibrations of S[23] and S[234] that are reliable at metallicities Z ≲ 0.5Z[ scriptstyle sun ].
Dopita Mike A.
Oey Sally M.
Shields Joseph C.
Smith Christopher R.
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