High-Resolution Observations of Comet Hyakutake (1996 B2): O ((1) D)

Details High-Resolution Observations of Comet Hyakutake (1996 B2): O ((1) D) High-Resolution Observations of Comet Hyakutake (1996 B2): O ((1) D)

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.6208c&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #62.08; Bulletin of the American Astronomical Society, Vol. 28, p.927

Astronomy and Astrophysics

Astronomy

Scientific paper

We obtained observations of comet Hyakutake (1996B2) with the 2DCoude spectrograph on the McDonald Observatory 2.7-m telescope on 30 March 1996 UT. The observations were at a nominal resolving power of 185,000. The spectra included the O((1) D) (6300 Angstroms) emission line from the comet. The doppler shift was sufficient to separate clearly the cometary emission line from the telluric oxygen line. The spectrograph entrance slit subtended 0.34x8.2arcsec on the sky. A ThAr line had a width of approximately 3 pixels with this setup (FWHM=0.034 Angstroms), while the cometary emission line was clearly resolved at ~ 6 pixels. The O((1) D) emission arises from the photodissociation of H2O, the dominant parent ice. The branching ratio to produce the oxygen ((1) D) is approximately 7% of the photodissociations. The production of the oxygen emission line is by prompt emission. Thus, the width of the 6300 Angstroms O((1) D) line is a direct measure of the gas outflow velocity of the coma. We will present our observations of this emission line along with modeling of the data to derive the outflow velocity. These observations represent a unique opportunity to study a comet at such high spectral resolving power in order to accurately measure the line width.

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