Other
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pkas...14...33k&link_type=abstract
Publications of the Korean Astronomical Society, vol. 14, no. 1, pp. 33-37
Other
Scientific paper
We have constructed a synthetic spectrum of the 2.5 micron C_2H bands and compared them with diminutive structures in the near-infrared spectra of Comets P/Halley and West (1976 VI). We found that the Q branches of the C_2H bands coincide with two small emission peaks in the spectra of the comets. We undertook Monte Carlo simulations using observed emission intensities of C_2 and possibly C_2H in Comet P/Halley in order to derive a lifetime range of C_2H and a production rate at the time of observations of P/Halley. We obtained a C_2H production rate of 1 X 1027 sec^{-1} for P/Halley on December 20, 1985, assuming the 2.5 micron features are due to C_2H. We derived a very short lifetime (< 100 seconds) of C_2H at 1 AU heliocentric distance, assuming that the only parent molecule for C_2H and C_2 is C_2H_2. Using this short lifetime we were unable to fit our C_2 distribution model to C_2 distribution curves observed by O'Dell et al. (1988), because our curve shows a steep slope compared with the observed one. We conclude that there must be significant additional source(s) for C_2H and C_2 other than C_2H_2.
Joon Kim Sang
Samarasinha Nalin H.
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