A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418.
Abstract
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.
- Publication:
-
Ultraviolet observations of Quasars
- Pub Date:
- April 1980
- Bibcode:
- 1980ESASP.157..197C
- Keywords:
-
- Astronomy;
- Carbon Monoxide;
- Emission Spectra;
- Iue;
- Planetary Nebulae;
- Ultraviolet Astronomy;
- Absorption Spectra;
- Continuous Spectra;
- Molecular Rotation;
- Molecular Spectra