Article (Scientific journals)
Optical observations of comet Hale-Bopp (C/1995 O1) at large heliocentric distances before perihelion.
Rauer, H.; Arpigny, Claude; Boehnhardt, H. et al.
1997In Science, 275, p. 1909-1912
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Keywords :
Cometary Dust: Spectroscopy; Comets: CN
Abstract :
[en] The activity of comet Hale-Bopp (C/1995 O1) was monitored monthly by optical imaging and long-slit spectroscopy of its dust and gas distribution over heliocentric distances of 4.6 to 2.9 AU. The observed band intensities of the NH[SUB]2[/SUB] radical and the H[SUB]2[/SUB]O[SUP]+[/SUP] ion cannot be explained by existing models of fluorescence excitation, warranting a reexamination of the corresponding production rates, at least at large heliocentric distances. Comparing the production rate of the CN radical to its proposed parent, HCN, shows no evidence for the need of a major additional source for CN in Hale-Bopp at large heliocentric distances. The dust and CN production rates are consistent with a significant amount of sublimation occurring from icy dust grains surrounding Hale-Bopp.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauer, H.
Arpigny, Claude ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Boehnhardt, H.
Colas, F.
Crovisier, J.
Jorda, L.
Kuppers
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Rembor, K.
Thomaa
Language :
English
Title :
Optical observations of comet Hale-Bopp (C/1995 O1) at large heliocentric distances before perihelion.
Publication date :
01 March 1997
Journal title :
Science
ISSN :
0036-8075
eISSN :
1095-9203
Publisher :
American Association for the Advancement of Science, Washington, United States - District of Columbia
Volume :
275
Pages :
1909-1912
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 February 2010

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