Analysis of hydroxyl data from comet Austin 1982g

Details Analysis of hydroxyl data from comet Austin 1982g Analysis of hydroxyl data from comet Austin 1982g

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..459w&link_type=abstract

In ESA 4th European IUE Conf. p 459-462 (SEE N84-35135 24-88)

Astronomy and Astrophysics

Astronomy

3

Atmospheric Chemistry, Comet Nuclei, Cometary Atmospheres, Hydroxyl Emission, Spectroheliographs, Flux Density, Iue, Radio Sources (Astronomy), Spectral Emission, Sublimation, Ultraviolet Spectroscopy

Scientific paper

Low resolution IUE SWP and LWR images of Comet Austin covering three weeks pre-perihelion and one post-perihelion are discussed. The OH(1-0) band intensities agree with theoretical calculations relative to the (0-0) band, but observed (1-1) intensities tend to be higher. Scans within the LWR slit augmented by SAP allow determination of OH-parent scale lengths at 34,000 km, significantly shorter than used for H2O. Rederived source strengths, lower by a factor 2 when this shorter scale is used, still increase steeply pre-perihelion (index around -3.6 at 0.9AU) comparable to comet Bradfield 1979X, and drop off more sharply by 1.5AU post-perihelion, implying a nucleus composition much less volatile than H2O ice.

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