The HNC/HCN ratio in comets.
Earth Moon Planets
; 78(1-3): 29-35, 1997.
Article
em En
| MEDLINE
| ID: mdl-11543322
ABSTRACT
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 in significant 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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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cianeto de Hidrogênio
/
Meteoroides
/
Cianetos
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Earth Moon Planets
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Estados Unidos