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Interpretation of the Ultraviolet Spectrum of NGC 7662

Published online by Cambridge University Press:  22 September 2016

R.C. Bohlin
Affiliation:
Goddard Space Flight Center
J.P. Harrington
Affiliation:
University of Maryland
T.P. Stecher
Affiliation:
Goddard Space Flight Center

Extract

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The ultraviolet emission lines that were me asured in the spectrum obtained from our rocket observation of NGC 7662 have been compared with those predicted by a set of models. The models allow a determination of the carbon abundance which is found to be solar and the C/0 ratio which is equal to unity. In order to obtain a good fit, dielectronic recombination and charge exchange between neutral hydrogen and C IV were included, both of which increase the concentration of C III. The observed continuum consists of light from the central star and from the nebula, which contributed primarily via the two photon process in the H° and the Balmer continuum.

Type
Session II: Observations of Planetary Nebulae
Copyright
Copyright © Reidel 1978