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

Clavel, J.; Flower, D.R.

Abstract

The continuous emission of IC 418 has been observed at high dispersion with the IUE satellite and the spectrum searched for the A1Π−X1Σ+A1Π−X1Σ+ 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 → 0 rotational transition at 2.6 mm.

• Journal Article Type: Article
• Publication Date: 1980-01
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Volume: 190
• Issue: 1
• Pages: 1P-4P
• DOI: https://doi.org/10.1093/mnras/190.1.1p
• Public URL: https://durham-repository.worktribe.com/output/1593061