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LAFFONT CÉLINE ROUSSELOT P. CLAIREMIDI J. MOREELS G. BOICE D. C. 《Earth, Moon, and Planets》1997,78(1-3):211-217
An observation program for measuring the activity of Comet Hale-Bopp was conducted at the Observatoire de Haute Provence from
August 1996 to April 1997. Narrow band images were obtained from the 120 cm telescope. A set of four filters at 513, 516,
527 and 682 nm was used to measure the C2 emission in the (1,1) and (0,0) band and the intensity of the dust-scattered continuum. The luminosity of the central part
of the coma was measured in the continuum and C2 emissions, as a function of heliocentric distance before perihelion. The activity of the comet considerably increased between
October 1996 and February 1997. The images obtained in August, September and October 1996 show the presence of strong jets.
In February, March and April 1997, series of roughly concentric arcs were observed in the sunward hemisphere of the coma.
The arcs were also detected in the spatial distribution of the I(682 nm)/I(527 nm) red color ratio and the I(513 nm)/I(516
nm) C2 emission ratio. Using the I(513 nm)/I(516 nm) ratio as a parameter to measure the degree of excitation of C2 molecules, we can show that the local production of gas, probably resulting from dust fragmentation, should be taken into
account.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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