The ionization structure of planetary nebulae. III - NGC 7009
1983; IOP Publishing; Volume: 267; Linguagem: Inglês
10.1086/160899
ISSN1538-4357
Autores Tópico(s)History and Developments in Astronomy
Resumoview Abstract Citations (89) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The ionization structure of planetary nebulae. III. NGC 7009. Barker, T. Abstract Barker has found (1980, 1982) that combined optical and ultraviolet observations in several different regions of one planetary nebula, NGC 6720, can be used both to estimate particularly reliable total elemental abundances and to learn more about the physical conditions in the nebula. It is important, however, that all the observations be made in the same regions of a nebula. The decision was made to conduct optical and ultraviolet observations with similar entrance apertures in a number of positions in several extended planetary nebulae. For the present investigation, NGC 7009 was chosen. In connection with these studies, optical estimates of the abundances of a number of elements in NGC 7009 have been confirmed by UV measurements of their higher ionization stages. This is particularly gratifying for N, because previous studies suggested that this element could not be adequately measured from optical observations alone. Publication: The Astrophysical Journal Pub Date: April 1983 DOI: 10.1086/160899 Bibcode: 1983ApJ...267..630B Keywords: Abundance; Nebulae; Planetary Nebulae; Ultraviolet Spectra; Electron Density (Concentration); Electron Energy; Ionization; Iue; Line Spectra; Rare Gases; Spectrophotometry; Astrophysics full text sources ADS | data products SIMBAD (2) MAST (1) INES (1) Related Materials (16) Part 1: 1980ApJ...240...99B Part 2: 1982ApJ...253..167B Part 3: 1982ispn.rept.....B Part 5: 1983ispn.rept.....B Part 6: 1984ApJ...284..589B Part 7: 1985ispn.rept.....B Part 8: 1985ApJ...294..193B Part 9: 1986ApJ...308..314B Part 10: 1986STIN...8717582B Part 11: 1987ApJ...322..922B Part 12: 1987ispn.rept.....B Part 13: 1988ApJ...326..164B Part 14: 1988ispn.rept.....B Part 15: 1989ApJ...340..921B Part 16: 1989STIN...9029274B Part 17: 1991ApJ...371..217B
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