Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..153l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 153-174.
Astronomy and Astrophysics
Astronomy
90
Asymptotic Giant Branch Stars, Carbon Monoxide, Cool Stars, Infrared Astronomy Satellite, Molecular Clouds, Star Formation, Stellar Envelopes
Scientific paper
An investigation is presented of a sample of 77 objects with IRAS flux ratios similar to those of evolved AGB stars with very cold circumstellar envelopes (CSE), and CO observations are used to help identify their nature. The 21 post-AGB candidates in the sample were found to share the characteristics of low color temperature, and, for most, low IRAS variability. They are discussed in terms of three categories: intermediate spectral type stars with expanding molecular shells, cold circumstellar shells with CO but with no OH emission, and irregular or nonvariable OH/IR stars. The evolved stars with detected CO, when compared with those in which CO was not detected, exhibit the following characteristics: redder IRAS colors, red low-resolution spectrometer class but not class 3n, not variable (low VAR), optical counterpart, and no OH emission. Evolved stars can be distinguished from cloud sources on the basis of IRAS flux ratios.
Forveille Thierry
Likkel Lauren
Morris Marita
Omont Alain
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