Sodium Velocities and Sources in Hale-Bopp

Details Sodium Velocities and Sources in Hale-Bopp Sodium Velocities and Sources in Hale-Bopp

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..134..228b&link_type=abstract

Icarus, Volume 134, Issue 2, pp. 228-234.

Computer Science

6

Scientific paper

We use spatially resolved high-resolution spectra of the 5890 and 5896 A 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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