Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..298c&link_type=abstract
Astronomical Journal, vol. 86, Feb. 1981, p. 298-305.
Astronomy and Astrophysics
Astronomy
27
Absorption Spectra, Neptune (Planet), Titan, Ultraviolet Reflection, Ultraviolet Spectra, Uranus (Planet), Albedo, Data Reduction, Iue, Methane, Rayleigh Scattering, Reflectance, Satellite Atmospheres, Signal To Noise Ratios, Ultraviolet Absorption, Planets, Uranus, Neptune, Titan, Observations, Iue, Ultraviolet, Data, Spectrum, Wavelengths, Absorptions, Reflectivity, Scattering, Models, Photometry, Albedo, Pressure, Atmosphere, Data Reduction, Gases, Methane, Aerosols, Jupiter, Satellites
Scientific paper
The ultraviolet spectra of Uranus, Neptune, and Titan do not reveal absorption features at 7-A resolution from 2100 to 3200 A. Upper limits of from 1 to 3 A are set for the equivalent widths of narrow absorptions, which corresponds to a CO/H2 mixing ratio less than 2 x 10 to the -4th in the case of Uranus. The slopes of the continuum reflectivities of Uranus and Neptune are consistent with the semi-infinite Rayleigh-Raman scattering model of Cochran, while the absolute levels are matched only if solar photometry is modified within acceptable limits. An alternative, but less satisfactory explanation of the new data is that the UV reflectivities of both Uranus and Neptune are depressed uniformly by a continuum absorber. The suggestion by Savage et al (1980) that the albedo of Uranus decreases by approximately 20% from 2200 to 1800 A is not confirmed. For Titan, the albedo decreases monotonically toward shorter wavelengths down to 2300 A. New limits are set for the pressure level in the atmosphere of Titan up to which the real, but presently unidentified, UV absorber there must extend, and for the fraction of Titan that must be covered by this absorber
Butterworth Paul S.
Caldwell J. Jr. J.
Hunt Garry E.
Moore V.
Owen Theodore
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