ORBi: Lambert D. L. - High-resolution spectroscopy of the C2 Swan 0-0 band from Comet P/Halley

Reference : High-resolution spectroscopy of the C2 Swan 0-0 band from Comet P/Halley


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/18234

Title :	High-resolution spectroscopy of the C2 Swan 0-0 band from Comet P/Halley
Language :	English
Author, co-author :	Lambert, D. L. [ > > ]
	Sheffer, Y. [Texas, University, Austin]
	Danks, A. C. [Applied Research Corp., Landover, MD]
	Arpigny, Claude [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
	Magain, Pierre [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Publication date :	1-Apr-1990
Journal title :	Astrophysical Journal
Publisher :	University of Chicago Press
Volume :	353
Pages :	640-653
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0004-637X
City :	Chicago
Country :	IL
Keywords :	[en] ASTRONOMICAL SPECTROSCOPY ; COMETS ; CARBON ; HALLEY'S COMET ; SPECTRAL BANDS ; SWAN BANDS ; EMISSION SPECTRA ; HIGH RESOLUTION ; HALLEY ; SPECTROSCOPY ; CARBON ; SPECTRA ; TEMPERATURE ; ROTATION ; COMPARISONS ; FLUORESCENCE ; ABUNDANCE ; EMISSIONS ; EARTH-BASED OBSERVATIONS ; STRUCTURE ; WAVELENGTHS ; INTENSITY ; MOLECULES ; ASTRONOMY ; SOLAR EFFECTS ; DISTANCE
Abstract :	[en] High-resolution spectra of the C2 Swan system's 0-0 band from Comet P/Halley in March 1986 show that the populations of the upper state's rotational levels may be described by two rotational temperatures. The low rotational levels provide a low temperature, Trot = about 600 - 700 K. The higher levels correspond to about 3200 K. If a contribution from the 3200-K molecules is subtracted from the populations of the low-J-prime levels, the latter are characterized by Trot = about 190 K. A comparison with recent predictions for C2 molecules fluorescing in sunlight shows that the observed and predicted level populations are in good agreement for J-prime greater than about 15, but there is a sharp disagreement for the low rotational levels.
Permalink :	http://hdl.handle.net/2268/18234
DOI :	10.1086/168654
Other URL :	http://adsabs.harvard.edu/abs/1990ApJ...353..640L
Mentions required by the publisher for OA :	The authors thank The University of Chicago Press for their deposit authorization.

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