Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..237h&link_type=abstract
In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 237-240 (SEE N93-19113 06-90)
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1
Astronomical Spectroscopy, Austin Comet, Comet Nuclei, Cometary Atmospheres, Data Reduction, Emission Spectra, Interstellar Chemistry, Amino Radical, Ammonia, Carbon Monoxide, Charge Coupled Devices, Telescopes, Water Vapor
Scientific paper
Longslit CCD spectra (lambda = 5100-6400 A, delta(lambda) approximately 3 A) were obtained with the Michigan-Dartmouth-MIT 1.3 meter telescope in May 1990 (r = 0.74 AU, delta = 0.50 AU). The spectra were reduced with the Interactive data Reduction and Analysis Facility (IRAF). Spectral extractions offset sunward and tailward from the nucleus were analyzed. Species identified in the spectra include the following: C2, NH2(10-0), NH2(9-0), H2O(+), and CO(+). Spatial extractions of rotational line intensities in the NH2(10-0) band extend approximately 104.5 km from the nucleus. A fit of the vectorial model to the NH2(10-0) spatial profile is consistent with an NH3 parent molecule. The NH2 production rate and an ammonia to water abundance ratio, NH3/H2O approximately 3 percent, were derived. The ammonia abundance obtained for comet Austin is consistent with that found for several other comets and is indicative of comet formation under very homogeneous conditions.
Heyd Rodney
Mack Peter
Wehinger Peter
Wyckoff Susan
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