CCD Observations of Comet Hale-Bopp at Shajn Telescope I. Coude spectra

Details CCD Observations of Comet Hale-Bopp at Shajn Telescope I. Coude spectra CCD Observations of Comet Hale-Bopp at Shajn Telescope I. Coude spectra

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997em%26p...78..119k&link_type=abstract

Earth, Moon, and Planets, v. 78, Issue 1/3, p. 119-125 (1997).

Astronomy and Astrophysics

Astrophysics

2

Comet Hale-Bopp, Coude Spectrum, Identified Emissions

Scientific paper

Spectroscopic observations of Comet Hale-Bopp were made at the 2.6 m Shajn Telescope of the Crimean Astrophysical Observatory. Some spectra were obtained with high spectral resolution, FWHM = 0.18 0.4Å, in the coude focus on February 22 and 26, 1997. The observations were made in selected spectral windows (4805 4872 Å,6528 6595 Å, 7186 7253 Å, 8276 8408 Å).The spectrograph slit was centered on the nucleus and had dimensions of 25.2 × 0.6 arcsec2 on the plane of the sky. The continuum spatial profiles were extremely asymmetrical toward the Sun. However, the continuum-subtracted spatial profiles of the molecular emissions were symmetrical relative to the nucleus, except for C2. The shape of the spatial profiles of the C2 emissions is similar to that one of continuum but is more flattened. So, there are evidences that dust can be an additional source of the C2 radicals in the cometary coma. The main aim of our research was identification of the cometary emissions. Using recent laboratory spectroscopic data we identified newlines of C2 associated with the transitions from high rotational levels in the 4805 4872 Å spectral region. We detected cometary Hα emission as well. Emissions of NH2, H2O+,and C2 (Phillips system) were found in the red spectral windows. Some emission features are still unassigned.

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