Computer Science – Sound
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.3724m&link_type=abstract
American Astronomical Society, DPS meeting #29, #37.24; Bulletin of the American Astronomical Society, Vol. 29, p.1051
Computer Science
Sound
Scientific paper
A sounding rocket observation of comet Hale-Bopp was conducted on 1997 April 6 03:51 UT, when the comet was at heliocentric and geocentric distances of 0.92 and 1.39 AU, respectively. The instrument consisted of a 40 cm f/15.5 Dall-Kirkham telescope, a sealed 400mm Rowland circle spectrograph with a holographically ruled, astigmatism corrected grating, and a microchannel plate (MCP) detector with a double-delay-line anode. A long slit (7 arcsec x 260 arcsec, {7.1}{3}km x {2.6}{5}km at the comet) located at the focus of the telescope served as the entrance pupil to the spectrograph. Spectral resolution of ~5 Angstroms was achieved over the entire bandpass (1280-1850 Angstroms). The spatial resolution of the telescope was ~1'' (1000km at the comet). All optical surfaces were coated with MgF_2 over Al and the spectrograph was sealed with a 2 mm thick CaF_2 window, eliminating contamination by Hi lambda 1216. The effective area of the instrument over the majority of the bandpass was 10--15 cm(2). During the observation the slit sampled the coma along the sun-comet line from ~{9}{4}km sunward to ~{2}{5}km tailward. Emissions from O, C, S and CO are detected with almost all emissions showing a sunward enhancement. ion{O}{1} lambda 1304, ion{C}{1} lambda lambda 1561 and 1657 emissions fill the aperture and show little evidence of a peaked distribution. Several multiplets of ion{S}{1} are observed over a gradient of optical depths. The optically thin ion{S}{1} lines show a spatial distribution peaked at the nucleus while the most optically thick line shows no evidence of a peaked distribution. Numerous bands of the CO Fourth Positive system (A sing PI - X sing SIGMA) are present in the data and all show a peaked distribution, although the stronger transitions are less peaked than the weaker ones. The forbidden ion{O}{1} lambda 1356 transition is detected and exhibits a spatial profile similar to that of the CO Fourth Positive bands. ion{C}{2} lambda 1335 is detected with a spatial profile enhanced in the tailward direction.
Burgh Eric B.
Feldman Paul D.
McCandliss Stephan R.
McPhate Jason B.
Pelton Russell
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