Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..923o&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Sept. 15, 1980, p. 923-928. Research supported by the John Simon Guggenheim Memorial F
Astronomy and Astrophysics
Astrophysics
15
Astronomical Spectroscopy, D Lines, Sodium, West Comet, Abundance, Cosmic Dust, Emission Spectra, Grains, Comets, West Comet, Sodium, Source Medium, Emissions, Spectrum, Analysis, Dust, Grains, Wavelengths, Evaporation, Observations, Data, Photodissociation, Volatile Elements, Abundance, Intensity, Infrared, Light (Visible Radiation), Scattering, Temperatures, Models
Scientific paper
A spectrum of the sodium D-line emission from Comet West (1975n) taken at heliocentric distance 1.4 AU is analyzed by comparing the D-line brightness to that in the underlying continuum. Using the observations of this comet by Ney and Merrill, it is found that the dust grains which dominate the visible and infrared continua are too cool to provide the observed sodium atoms through evaporation of sodium metal or a sodium compound from grain surfaces. Though sodium metal may evaporate from a small-grain component, it is suggested that molecules embedded in the volatile nuclear matrix are a more plausible source of sodium. The relationship between this source and the interstellar sodium abundance is discussed.
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