Calibrating nebular diagnostics of t* and abundance
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2002
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| _version_ | 1876424476277604352 |
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| author | J. C. Shields |
| author_facet | J. C. Shields |
| contents | Calibrating nebular diagnostics of t* and abundance J. C. Shields C. Smith M. S. Oey M. A. Dopita Física, Astronomía y Matemáticas H II REGIONS MAGELLANIC CLOUDS SUPERNOVA REMNANTS GALAXIES: ABUNDANCES STARS: FUNDAMENTAL PARAMETERS We obtained nebular spectroscopy of LMC H II regions having classied stellar populations, thereby stronglyconstraining the ionization input parameters. Using photoionization models, we then evaluate the performanceof nebular diagnostics of T? and abundance. We introduce [Ne III]/H as a nebular diagnostic of the ionizingstellar T?. In contrast to the widely-used 0 parameter, [Ne III]/H has greater sensitivity to mid and early Ostars,and is robust to nebular morphology and the presence of shocks. We present a preliminary calibration ofboth T? diagnostics for LMC metallicity. We also introduce S234 ([S II] + [S III] + [S IV])/H as a diagnosticof S abundance. S234 is much less sensitive to the nebular ionization parameter than is S23 or R23. Theintensity of [S IV] 10.5 m is easily estimated from the optical and near-IR line ratios. We present calibrationsof S23 and S234 that are reliable at metallicities Z < 0:5Z. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112027 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.12 |
| format | Artículo científico |
| id | redalyc_57112027 |
| institution | Redalyc |
| language | en |
| publishDate | 2002 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Calibrating nebular diagnostics of t* and abundance J. C. Shields Física, Astronomía y Matemáticas H II REGIONS MAGELLANIC CLOUDS SUPERNOVA REMNANTS GALAXIES: ABUNDANCES STARS: FUNDAMENTAL PARAMETERS Calibrating nebular diagnostics of t* and abundance J. C. Shields C. Smith M. S. Oey M. A. Dopita Física, Astronomía y Matemáticas H II REGIONS MAGELLANIC CLOUDS SUPERNOVA REMNANTS GALAXIES: ABUNDANCES STARS: FUNDAMENTAL PARAMETERS We obtained nebular spectroscopy of LMC H II regions having classied stellar populations, thereby stronglyconstraining the ionization input parameters. Using photoionization models, we then evaluate the performanceof nebular diagnostics of T? and abundance. We introduce [Ne III]/H as a nebular diagnostic of the ionizingstellar T?. In contrast to the widely-used 0 parameter, [Ne III]/H has greater sensitivity to mid and early Ostars,and is robust to nebular morphology and the presence of shocks. We present a preliminary calibration ofboth T? diagnostics for LMC metallicity. We also introduce S234 ([S II] + [S III] + [S IV])/H as a diagnosticof S abundance. S234 is much less sensitive to the nebular ionization parameter than is S23 or R23. Theintensity of [S IV] 10.5 m is easily estimated from the optical and near-IR line ratios. We present calibrationsof S23 and S234 that are reliable at metallicities Z < 0:5Z. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112027 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.12 |
| title | Calibrating nebular diagnostics of t* and abundance |
| topic | Física, Astronomía y Matemáticas H II REGIONS MAGELLANIC CLOUDS SUPERNOVA REMNANTS GALAXIES: ABUNDANCES STARS: FUNDAMENTAL PARAMETERS |
| url | https://www.redalyc.org/articulo.oa?id=57112027 |