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New CO and HCN sources associated with IRAS carbon starsEmission of CO and HCN was detected in 22 out of a sample of 53 IRAS sources classified as unidentified carbon-rich objects. The sample was selected according to the presence of the silicon carbide feature as revealed by low-resolution spectra. The molecular line widths indicate that the CO and HCN emission arises from the circumstellar envelopes of very highly evolved stars undergoing mass loss. The visible stars tend to be deficient in CO as compared with unidentified sources. Most the detected CO and HCN IRAS stars are distinct and thick-shelled objects, but their infrared and CO luminosities are similar to those of IRC + 102156 AFGL and IRC-CO evolved stars. The 12 micron flux seems to be a good indicator of the distance, hence a guide for molecular searches.
Document ID
Document Type
Reprint (Version printed in journal)
NGUYEN-Q-RIEU (Observatoire de Paris-Meudon France)
Epchtein, N. (Observatoire de Paris-Meudon France)
TRUONG-BACH (Paris Observatoire, Meudon, France)
Cohen, M. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1987
Publication Information
Publication: Astronomy and Astrophysics
Volume: 180
Issue: 1-2,
ISSN: 0004-6361
Subject Category
Distribution Limits