CCD OBSERVATIONS OF COMET HALE–BOPP AT SHAJN TELESCOPE I. COUDE SPECTRA


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Abstract

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 = 0.18–0.4 Å, 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 arcsec2on 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 C2emissions is similar to that one of continuum but is more flattened. So, there are evidences that dust can be an additional source of the C2radicals in the cometary coma. The main aim of our research was identification of the cometary emissions. Using recent laboratory spectroscopic data we identified new lines of C2associated with the transitions from high rotational levels in the 4805–4872 Å spectral region. We detected cometary Hαemission 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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