Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2003
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| _version_ | 1876480260240834560 |
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| author | M. Cerviño |
| author_facet | M. Cerviño |
| contents | Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps M. Cerviño E. Pérez V. Luridiana Física, Astronomía y Matemáticas Planetary Nebulae: General Instrumentation: Miscellaneous Planetary Nebulae: Individual: NGC 6543 We determine the physical conditions in NGC 6543, obtaining two different estimates of the electron temperature (Te) and one estimate of the electron density (Ne). The electron temperature is computed by means of the [O III] ratio λ5007/λ 4363, and of the diagnostic diagram combining λ5007 to the [O III] infrared lines 52 μ and 88μ. The continuum intensity measured on slit spectra is much higher than theoretically predicted under the simplest assumptions. After considering several possibilities, we suggest enhanced 2-photon emission as the most probable source of the additional continuum. While Te and Ne derived from the diagnostic diagram agree with the most recent determination, Te derived from λ5007/λ 4363 is smaller than previously published values, probably due to the bias in λ 4363 introduced by the uncertainty in the continuum. Our main conclusion is that it is not possible, with present-day data, to derive accurate temperature maps of photoionized nebulae. 2003 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101815 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.18 |
| format | Artículo científico |
| id | redalyc_57101815 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps M. Cerviño Física, Astronomía y Matemáticas Planetary Nebulae: General Instrumentation: Miscellaneous Planetary Nebulae: Individual: NGC 6543 Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps M. Cerviño E. Pérez V. Luridiana Física, Astronomía y Matemáticas Planetary Nebulae: General Instrumentation: Miscellaneous Planetary Nebulae: Individual: NGC 6543 We determine the physical conditions in NGC 6543, obtaining two different estimates of the electron temperature (Te) and one estimate of the electron density (Ne). The electron temperature is computed by means of the [O III] ratio λ5007/λ 4363, and of the diagnostic diagram combining λ5007 to the [O III] infrared lines 52 μ and 88μ. The continuum intensity measured on slit spectra is much higher than theoretically predicted under the simplest assumptions. After considering several possibilities, we suggest enhanced 2-photon emission as the most probable source of the additional continuum. While Te and Ne derived from the diagnostic diagram agree with the most recent determination, Te derived from λ5007/λ 4363 is smaller than previously published values, probably due to the bias in λ 4363 introduced by the uncertainty in the continuum. Our main conclusion is that it is not possible, with present-day data, to derive accurate temperature maps of photoionized nebulae. 2003 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101815 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.18 |
| title | Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps |
| topic | Física, Astronomía y Matemáticas Planetary Nebulae: General Instrumentation: Miscellaneous Planetary Nebulae: Individual: NGC 6543 |
| url | https://www.redalyc.org/articulo.oa?id=57101815 |