Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1207s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 1207-1212.
Astronomy and Astrophysics
Astronomy
5
Comet Nuclei, Cosmic Dust, Emission Spectra, Line Spectra, Spatial Resolution, Spectrum Analysis
Scientific paper
The unusual displacements between the radical emission-line gas and the scattered-light dust continuum of IRAS-Araki-Alcock (1983 VII) and P/Tempel 2 (1988 IXV) are presented. Two-dimensional spectral images were flattened by dome flats and twilight sky-flats, and the actual sky subtraction was obtained by sequentially observing clear patches of sky before and after the cometary integrations. A set of slight distributions were obtained along the solar radius vector through the 'optocenter' toward the antisolar direction. Spectral-spatial cross cuts are illustrated, and the continuum and the emission-line regions in the panels are shown. The continuum of IRAS-Araki-Alcock is found to be much stronger than the cometary comae emissions near the nucleus. For the spectra of the relatively faint Comet P/Tempel 2, both dust and gas emission are weaker, and some 'derivatives' remain.
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