comets: general; comets: individual: C/1995 O1 (Hale-Bopp); solar system: general
Abstract :
[en] We observed comet C/1995 O1 (Hale-Bopp) at 4.6-2.9 AU pre-perihelion and 2.8-12.8 AU post-perihelion with optical long-slit spectroscopy. Emission bands of CN, C[SUB]3[/SUB], C[SUB]2[/SUB] and NH[SUB]2[/SUB] have been covered. Emission of C[SUB]3[/SUB] was detected up to 7.0 AU, and CN could be followed up to 9.8 AU post-perihelion. Spatial column density profiles of the radicals have been used to derive effective parent Haser scale lengths for heliocentric distances beyond 3 AU. Production rates were derived based on these Haser scale lengths. The observations of CN are in agreement with HCN as the major parent molecule of this radical at large distances from the Sun (i.e. beyond ~ 3 AU). We compare the measured CN production rate to sublimation rates of HCN from a simple nucleus sublimation model. The variation of CN production rates with changing heliocentric distance gives no indication for sublimation from the interior and is consistent with very little thermal lag of the nucleus. Based on observations collected at the European Southern Observatory, Chile, and the Observatoire de Haute Provence, France.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauer, H.; DLR, Institute of Space Sensor Technology and Planetary Exploration, Rutherfordstr. 2, 12489 Berlin, Germany
Helbert, J.; DLR, Institute of Space Sensor Technology and Planetary Exploration, Rutherfordstr. 2, 12489 Berlin, Germany
Arpigny, Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Benkhoff, J.; DLR, Institute of Space Sensor Technology and Planetary Exploration, Rutherfordstr. 2, 12489 Berlin, Germany
Bockelée-Morvan, Dominique; Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France
Boehnhardt, H.; European Southern Observatory, Alonso de Cordova 3107, Santiago de Chile
Colas, F.; Bureau des Longitudes, 77 avenue Denfert Rochereau, 75014 Paris, France
Crovisier, J.; Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France
Hainaut, O.; European Southern Observatory, Alonso de Cordova 3107, Santiago de Chile
Jorda, L.; Laboratoire d'Astrophysique de Marseille, Site Pereisc, 13376 Marseille Cedex 12, France
Manfroid, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
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