NDLI: Theoretical spectroscopy of comets (Document No: 19890007255)

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Theoretical spectroscopy of comets (Document No: 19890007255)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ahearn, Michael F.
Copyright Year	1988
Description	Theoretical spectra of various emitting species in cometary comae were calculated both to investigate physical parameters that are measureable with cometary spectra and to provide fluorescence efficiencies for the derivation of abundances from fluxes. NH was found to be much further from nucleus than proviously thought and, because previous fluorescence efficiencies were much too high, NH is 5 times more abundant than previously thought. The spectrum of S sub 2 in comet I-A-A was analyzed. Despite its short lifetime, S sub 2 reaches fluorescent equlibrium. The equilibrium spectrum matches the relative band strengths in IUE spectra much better than does single cycle fluorescence. Equilibrium (but not single-cylce) flurescence also predicts strong optical emission bands which are seen in ground-based spectra of comet I-A-A. Equilibrium fluorescence efficiencies are much higher than single-cycle fluorescence efficiencies implying S sub 2 is only half as abundant as previously estimated. Fluorescence spectrum of SO was calculated and compared with several IUE spectra including those in which Wallis and Krishna Swamy claim SO to be present. Relative intensities and shapes of bands are inconsistent with any real identification.
File Size	99883
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890007255
Archival Resource Key	ark:/13960/t9s22vz4p
Language	English
Publisher Date	1988-08-01
Access Restriction	Open
Subject Keyword	Astronomy Comets Spectroscopy Sulfur Compounds Emission Spectra Spectrum Analysis Hydrogen Compounds Fluorescence Nitrogen Compounds Infrared Spectra Oxygen Compounds Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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