Rotational structure of the (2, 0) Phillips band of C2 in Comet P/Halley

Details Rotational structure of the (2, 0) Phillips band of C2 in Comet P/Halley Rotational structure of the (2, 0) Phillips band of C2 in Comet P/Halley

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..465a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 465-468.

Astronomy and Astrophysics

Astrophysics

5

Carbon, Halley'S Comet, Molecular Rotation, Molecular Spectra, Spectral Bands, Astronomical Spectroscopy, Diatomic Molecules, Molecular Excitation, Swan Bands, Vibrational Spectra

Scientific paper

The results of the study of a digital echellogram of the nuclear region of comet Halley, containing the (2,0) Phillips band of C2 fully resolved, are presented. The intensities of individual lines, measured from the R-branch head up to R36, Q30, and P24, indicate a very high degree of rotational excitation. The population of the levels from where the lines arise, when approximated by a Boltzmann distribution, is found to be characterized by a temperature higher than that obtained from the Swan bands in other comets. An absolute calibration of the line fluxes has been obtained from narrow band CCD-imagery, to make feasible their comparison with measurements in the Swan system, probably carried out by other observers of comet Halley.

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