A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebulae IC 418

Details A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebulae IC 418 A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebulae IC 418

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..197c&link_type=abstract

The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited

Astronomy and Astrophysics

Astronomy

1

Carbon Monoxide, Emission Spectra, Iue, Planetary Nebulae, Ultraviolet Astronomy, Absorption Spectra, Continuous Spectra, Molecular Rotation, Molecular Spectra

Scientific paper

The continuous emission of IC418 was observed at high dispersion and the spectrum searched for the A (1) pi - chi (1) Sigma (+) bands of CO. It was not possible to unequivocally detect these CO bands in IC418. However, an upper limit to the absorption by CO was determined, giving a column density which is much less than the value implied by the J = 1 approaching O rotational transition at 2.6 mm.

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