The HNC/HCN Ratio in Comets

Details The HNC/HCN Ratio in Comets The HNC/HCN Ratio in Comets

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997em%26p...78...29i&link_type=abstract

Earth, Moon, and Planets, v. 78, Issue 1/3, p. 29-35 (1997).

Computer Science

11

Comets, Interstellar Molecules

Scientific paper

The abundance ratio of the isomers HCN and HNC has been investigated in comet Hale-Bopp (C/1995 O1) through observations of the J = 4-3 rotational transitions of both species for heliocentric distances 0.93 < r < 3 AU, both pre- and post-perihelion. After correcting for the optical depth of the stronger HCN line, we find that the column density ratio of HNC/HCN in our telescope beam increases significantly as the comet approaches the Sun. We compare this behavior to that predicted from an ion-molecule chemical model and conclude that the HNC is produced insignificant measure by chemical processes in the coma; i.e., for comet Hale-Bopp, HNC is not a parent molecule sublimating from the nucleus.

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