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J/A+A/267/515 Very cold C-rich circumstellar envelopes (Omont+ 1993)
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Beginning of ReadMe :J/A+A/267/515 Very cold C-rich circumstellar envelopes (Omont+ 1993)
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Characterization and proportion of very cold C-rich circumstellar envelopes
Omont A., Loup C., Forveille T., te Lintel Hekkert P.,
Habing H., Sivagnanam P.
<Astron. Astrophys. 267, 515, (1993)>
=1993A&A...267..515O
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ADC_Keywords: Infrared sources ; Radio lines ; Stars, carbon
Keywords: infrared radiation - radiolines: molecular - stars: carbon -
stars: circumstellar matter - stars: late-type - stars: OH/IR
Abstract:
The paper develops a method for identification of very cold C-rich
circumstellar envelopes (CSEs) in IR regions colder than region VII
(i.e., larger value of IRAS flux ratio S25/S12), by reviewing the
different criteria and by identifying C-rich CSEs in a sample of 228
bright IRAS sources. By using the results of OH surveys and catalogs
together with the results of additional HCN/CO millimeter observations
performed on critical classes of objects, a C/O classification is
proposed for 94 percent of the sources with a good probability. It is
shown that the low-resolution spectra by themselves are a reasonable
and easy way to identify C-rich late AGB CSEs. For post-AGB object
with cold CSEs, HCN and OH observations or visible/near IR
spectroscopy are necessary.