The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2004
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| _version_ | 1876431127324917760 |
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| author | J. P. Phillips |
| author_facet | J. P. Phillips |
| contents | The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies J. P. Phillips Física, Astronomía y Matemáticas ISM: LINES AND BANDS ISM: JETS AND OUTFLOWS PLANETARY NEBULAE: GENERAL It is now well established that circular, elliptical, and bipolar planetary nebulae(PNe) possess differing physical and spatial characteristics. Not only are theirstructures quite distinct, but they also appear to possess differing Zanstra temperatures,abundances, expansion velocities, brightness temperatures, and scale heightsabove the Galactic plane. We report here a further sensitive way in which the differencesbetween these outflows may be illustrated. We shall note that the nebulaeposses varying ranges of emission line ratio, and that this is likely to arise as a consequenceof their differing progenitor masses. Similarly, we point out the potentialof line-ratio mapping for analyzing other morphological classes, as well as for establishingthe uniqueness of their populations, and their relative progenitor masses.Thus we find that sources containing jets often possess low line emission intensitiesrelative to hydrogen, suggesting that their progenitors may have low overall masses.This conclusion is supported by a variety of independent observational evidence.We also show that irregular sources appear to represent a distinct class of outflows.It is likely that their mean progenitor masses are greater than those of ellipticalPNe, but less than thoseof the bipolar outflows. 2004 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57140206 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) Num.2 Vol.40 |
| format | Artículo científico |
| id | redalyc_57140206 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies J. P. Phillips Física, Astronomía y Matemáticas ISM: LINES AND BANDS ISM: JETS AND OUTFLOWS PLANETARY NEBULAE: GENERAL The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies J. P. Phillips Física, Astronomía y Matemáticas ISM: LINES AND BANDS ISM: JETS AND OUTFLOWS PLANETARY NEBULAE: GENERAL It is now well established that circular, elliptical, and bipolar planetary nebulae(PNe) possess differing physical and spatial characteristics. Not only are theirstructures quite distinct, but they also appear to possess differing Zanstra temperatures,abundances, expansion velocities, brightness temperatures, and scale heightsabove the Galactic plane. We report here a further sensitive way in which the differencesbetween these outflows may be illustrated. We shall note that the nebulaeposses varying ranges of emission line ratio, and that this is likely to arise as a consequenceof their differing progenitor masses. Similarly, we point out the potentialof line-ratio mapping for analyzing other morphological classes, as well as for establishingthe uniqueness of their populations, and their relative progenitor masses.Thus we find that sources containing jets often possess low line emission intensitiesrelative to hydrogen, suggesting that their progenitors may have low overall masses.This conclusion is supported by a variety of independent observational evidence.We also show that irregular sources appear to represent a distinct class of outflows.It is likely that their mean progenitor masses are greater than those of ellipticalPNe, but less than thoseof the bipolar outflows. 2004 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57140206 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) Num.2 Vol.40 |
| title | The Use of Line Excitation Mapping to Investigate Planetary Nebula Morphologies |
| topic | Física, Astronomía y Matemáticas ISM: LINES AND BANDS ISM: JETS AND OUTFLOWS PLANETARY NEBULAE: GENERAL |
| url | https://www.redalyc.org/articulo.oa?id=57140206 |