Mathematics – Probability
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85...74a&link_type=abstract
Astronomical Journal, vol. 85, Jan. 1980, p. 74-80.
Mathematics
Probability
25
Abundance, Astronomical Spectroscopy, Comets, Optical Emission Spectroscopy, Spectrophotometry, Carbon, Comet Nuclei, Cyanides, Emission Spectra, Molecular Spectra, Transition Probabilities, Comets, West Comet, Spectrophotometry, Observations, Data, Parameters, Emissions, Bands, Molecules, Ratios, Tago-Sato-Kosaka Comet, Kohoutek Comet, Abundance, Nucleus, Reflectivity, Bandwidths, Photometry, Flux, Intensity, Continuum, Angstroms, Vaporization, Spectrum, Distance, Production Rate
Scientific paper
Postperihelion observations of Comet West (1975n = 1976 VI) have been made with a Fourier transform spectrometer at heliocentric distances from 0.57 to 1.68 AU. Measurements were made of the emission bands of C2, CN, C3, CH, and NH2, as well as the emission lines of Na D and forbidden (O I), and the flux in the continuum in nine different bandpasses. Several ratios of the band strengths of CN have been used to determine the two free parameters in the fluorescence equilibrium model of CN of Danks and Arpigny (1973). From the values of the parameters it is inferred that the vibrational transition probability for the ground electronic state is between 0.025 and 0.075 per sec and that the ratio of oscillator strengths between the (0-0) bands of the violet and red systems is between 25 and 30. When corrected for field-of-view effects, NH2 shows no systematic variation in abundance relative to C2 while CH shows a small increase. The cometary continuum is found to be slightly redder than the solar continuum, consistent with results for other bright, dusty comets. The equivalent width of the Delta u = 0 sequence of C2 shows a marked decrease at r(H) = 1.2 AU.
A'Hearn Michael F.
Hanisch Robert J.
Thurber Clifford H.
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