CO observations of candidates for carbon-rich asymptotic giant branch and post-asymptotic giant branch stars

Details CO observations of candidates for carbon-rich asymptotic giant branch and post-asymptotic giant branch stars CO observations of candidates for carbon-rich asymptotic giant branch and post-asymptotic giant branch stars

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..292v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 1, p. 292-302.

Astronomy and Astrophysics

Astrophysics

29

Asymptotic Giant Branch Stars, Carbon Monoxide, Carbon Stars, Color-Color Diagram, Infrared Stars, Stellar Envelopes, Emission Spectra, Planetary Nebulae

Scientific paper

Circumstellar CO emission has been detected in a number of featureless or weak SiC emission, low color temperature IRAS sources. The CO detections confirm the suggestion that these are either extreme carbon stars, carbon-rich proto-planetary nebulae (PPNs), or carbon-rich planetary nebulae (PNs). We find that the CO emission is relatively stronger for a given luminosity in post-AGB stars than AGB stars, suggesting a more efficient excitation mechanism is at work in the post-AGB phase. One probable post-AGB star was detected in HCN for the first time. The available HCN data suggest a rapid decline in HCN emission after the AGB. Molecular emission is shown to be a useful tracer of the evolution from asymptotic giant branch to the planetary nebula phase.

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