Computer Science
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..136..268m&link_type=abstract
Icarus, Volume 136, Issue 2, pp. 268-279.
Computer Science
17
Scientific paper
Comet Hyakutake was an ideal target for studying the near-nuclear region of a bright comet. On 1996 March 26.3-26.5 (UT) we observed the comet with an echelle spectrometer at the 4-m telescope atop Kitt Peak. High-resolution spectra of NH and CH are presented and compared with fluorescence models. At a spectral resolution of Deltalambda <= 0.2 A two multiplets of ND are not blended by the overlying NH line forest. From these lines we derived a 3sigma upper limit for the D/H ratio in NH, (D/H)_NH <= 0.006. We reevaluated the g-factors for the NH (0-0) band and present g-factors for the strongest ND multiplets as a function of heliocentric velocity. Based on our measurements of the OH and NH (0-0) band we inferred a relative production rate Q(NH_3)/Q(H_2O) = (3.5 +/- 1.0) x 10^-3. We demonstrate that single-cycle fluorescence models can be used to describe the observed CH bands, if we introduce different rotational temperatures for the two spin states, T(F_1) = 100 K and T(F_2) = 130 K. These temperatures are believed to be remnants from a previous dissociative excitation. Obviously collisions or radiative processes cannot completely relax CH before the radical decays. The rotational temperature may thus provide clues to the identity of the CH parent(s). A theoretical analysis of CD suggests that several lines of the CD A-X system are not masked by CH lines.
A'Hearn Michael F.
Kim Sang J.
Meier Roland
Wellnitz Dennis
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