Title: Electron collisional excitation cross sections for Fe III and Fe VI and iron abundances in gaseous nebulae
Abstract:view Abstract Citations (82) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Electron collisional excitation cross sections for Fe III and Fe IV and ir...view Abstract Citations (82) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Electron collisional excitation cross sections for Fe III and Fe IV and iron abundances in gaseous nebulae. Garstang, R. H. ; Robb, W. D. ; Rountree, S. P. Abstract We have calculated electron impact excitation cross sections between most of the low metastable levels of Fe iii and Fe vi, using the close-coupling method. In addition, we have recalculated the electric quadrupole and magnetic dipole transition probabilities for these transitions in Fe vi. The statistical-equilibrium equations appropriate to a collisional/radiative model are solved to obtain level populations for each ion. Line emissivities have been calculated for the forbidden lines [Fe iii] and [Fe vi]. Comparison is made with intensities in several nebulae and peculiar stars. The iron abundances in the Orion Nebula, NGC 6720, N0C 7009, and NGC 7662 are discussed. NGC 7662 seems to have an iron abundance an order of magnitude smaller than the solar abundance. Subject headings: atomic processes - nebulae: abundances - transition probabilities Publication: The Astrophysical Journal Pub Date: May 1978 DOI: 10.1086/156152 Bibcode: 1978ApJ...222..384G Keywords: Astronomical Spectroscopy; Atomic Spectra; Electron Scattering; Iron; Planetary Nebulae; Magnetic Dipoles; Metastable State; Quadrupoles; Transition Probabilities; Astrophysics; Gaseous Nebulae:Iron; Transition Probabilities full text sources ADS | data products SIMBAD (6)Read More
Publication Year: 1978
Publication Date: 1978-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 46
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