Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..505r&link_type=abstract
In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 505-508 (SEE N93-19113 06-90)
Astronomy and Astrophysics
Astronomy
1
Amino Radical, Astronomical Spectroscopy, Chemical Composition, Comets, Halley'S Comet, Molecular Spectra, Photodissociation, Ammonia, Brightness Distribution, Charge Coupled Devices
Scientific paper
Long-slit spectra of comets Halley, Wilson and Nishikawa-Takamizawa-Tago were obtained with the 3.9 meter Anglo-Australian Telescope. Spectra of comets Halley and Wilson were obtained with the IPCS at a spectral resolution of 0.5 A and a spatial resolution of 103 km. Spectra of comets Wilson and Nishikawa-Takamizawa-Tago were obtained with a CCD at a spectral resolution of 1.5 A and a spatial resolution of approximately 3 x 103 km. Surface brightness profiles for NH2 were extracted from the long-slit spectra of each comet. The observed surface brightness profiles extend along the slit to approximately 6 x 104 km from the nucleus in both sunward and tailward directions. By comparing surface distribution calculated from an appropriate coma model with observed surface brightness distributions, the photodissociation timescale of the parent molecule of NH2 can be inferred. The observed NH2 surface brightness profiles in all three comets compares well with a surface brightness profile calculated using the vectorial model, an NH3 photodissociation timescale of 7 x 103 seconds, and an NH2 photodissociation timescale of 34,000 seconds.
Heyd Rodney
Ramsay D. A.
Rettig Terrence W.
Stathkis Raylee
Tegler Stephen C.
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