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Sodium Velocities and Sources in Hale–Bopp

Brown, M. E. and Bouchez, A. H. and Spinrad, H. and Misch, A. (1998) Sodium Velocities and Sources in Hale–Bopp. Icarus, 134 (2). pp. 228-234. ISSN 0019-1035. doi:10.1006/icar.1998.5941.

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We use spatially resolved high-resolution spectra of the 5890 and 5896 Å sodium D lines in the nuclear regions of Comet Hale–Bopp to determine the sources of cometary sodium. Comparison of the data to a Monte Carlo model of sodium dynamics suggests that the intensities and velocities of sodium in Hale–Bopp can be explained if 55% of the observed sodium is produced at the nucleus, the remaining 45% is produced in an extended source, and the sodium is accelerated by solar radiation pressure. Observations of H_2O^+in Hale–Bopp and subsequent modeling of a plasma-derived sodium source show that this source produces sodium at higher velocities than those observed; any contribution from such a source must be small. The combined nucleus and extended sources of sodium which fit our data best would create a sodium tail at a scale 100 times larger than that of these observations identical in morphology and velocity to that observed in Hale–Bopp.

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Brown, M. E.0000-0002-8255-0545
Additional Information:© 1998 Academic Press. Received September 15, 1997; revised March 2, 1998.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Issue or Number:2
Record Number:CaltechAUTHORS:20120927-120715254
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Official Citation:M.E. Brown, A.H. Bouchez, H. Spinrad, A. Misch, Sodium Velocities and Sources in Hale–Bopp, Icarus, Volume 134, Issue 2, August 1998, Pages 228-234, ISSN 0019-1035, 10.1006/icar.1998.5941. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34510
Deposited By: Ruth Sustaita
Deposited On:28 Sep 2012 18:22
Last Modified:09 Nov 2021 23:08

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