Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53l...5k&link_type=abstract
Publications of the Astronomical Society of Japan, vol.53, no. 1, p. L5-L8.
Astronomy and Astrophysics
Astronomy
12
Comets: General, Comets: Individual (C/1999S4: Linear), Molecular Processes
Scientific paper
We carried out a high-dispersion spectroscopic observation of the comet C/1999S4 (LINEAR) on 2000 July 8.75 (UT). The NH2 à (0, 10, 0)-X(0, 0, 0) and à (0,9,0)-X(0, 0, 0) bands were extracted from the observed spectrum and compared with the modeled spectra. We developed a fluorescence equilibrium model for the NH2, in which à (0, v'2, 0)-X(0, 0, 0) transitions and the radiative relaxation among the rotational levels in X(0, 0, 0) were considered. The rotational structure of the spin doublet ( F1 and F2 levels) and the Swings effect were considered in the model. The modeled spectra are consistent with the observed spectra of the à (0, 10, 0) and à (0, 9, 0)- bands. Our results show that the fluorescence excitation and the radiative relaxation processes are dominant for NH2 in a coma of the comet at - 1 AU from the Sun.
Abe Shinsuke
Furusho Reiko
Izumiura Hideyuki
Kawakita Hideyo
Kinoshita Daisuke
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