Abstract
view Abstract Citations (39) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Carbon in Comet Bradfield 1979l A'Hearn, M. F. ; Feldman, P. D. Abstract Ultraviolet spectra of comet Bradfield obtained with IUE show a surprising absence of CO(+) despite the presence of CO2(+), and they also show, for the first time, the unambiguous presence of the Mulliken bands of C2. With the use of simultaneous ground-based data, a value of 0.00001 is derived for the transition moment of the a 3 Pi-X 1 Sigma g + transition of C2. The anomalous CO(+)/CO2(+) ratio can be accounted for by the different scale lengths of the species rather than by an abundance difference. Using the model of Feldman (1978), the upper limit for CO(+) is found to be consistent with the observed abundance of CO. On that same model, however, CO cannot produce nearly as much atomic carbon as is observed. Publication: The Astrophysical Journal Pub Date: December 1980 DOI: 10.1086/183429 Bibcode: 1980ApJ...242L.187A Keywords: Abundance; Carbon; Comets; Ultraviolet Spectra; Brightness; Carbon Dioxide; Carbon Monoxide; Iue; Positive Ions; Astronomy full text sources ADS | data products MAST (1)
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