NDLI: Emission lines of [K V] in the optical spectra of gaseous nebulae.

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Emission lines of [K V] in the optical spectra of gaseous nebulae.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ryans, Robert S. I. Pollacco, Don L. Keenan, Michael T. C. Keenan, Francis P. Espey, Brian R. Exter, Katrina M. Aller, Lawrence H. Hyung, Siek
Description	Author Affiliation: Keenan FP ( Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland. f.keenan@qub.ac.uk);
Abstract	Recent R-matrix calculations of electron impact excitation rates in K v are used to derive the nebular emission line ratio R = I(4122.6 A)/I(4163.3 A) as a function of electron density (N(e)). This ratio is found to be very sensitive to changes in N(e) over the density range 10(3) to 10(6) cm(-3), but does not vary significantly with electron temperature, and hence in principle should provide an excellent optical N(e) diagnostic for the high-excitation zones of nebulae. The observed value of R for the planetary nebula NGC 7027, measured from a spectrum obtained with the Hamilton Echelle spectrograph on the 3-m Shane Telescope, implies a density in excellent agreement with that derived from [Ne iv], formed in the same region of the nebula as [K v]. This observation provides observational support for the accuracy of the theoretical [K v] line ratios, and hence the atomic data on which they are based. However, the analysis of a high-resolution spectrum of the symbiotic star RR Telescopii, obtained with the University College London Echelle Spectrograph on the 3.9-m Anglo-Australian Telescope, reveals that the [K v] 4122.6 A line in this object is badly blended with Fe ii 4122.6 A. Hence, the [K v] diagnostic may not be used for astrophysical sources that show a strong Fe ii emission line spectrum.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	7
Volume Number	99
Language	English
Publisher	National Academy of Sciences
Publisher Date	2002-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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