Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..339d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 339-354.
Astronomy and Astrophysics
Astronomy
21
Carbon Monoxide, Carbon Stars, Emission Spectra, Infrared Astronomy Satellite, Silicon Oxides, Line Spectra, Silicates, Stellar Envelopes, Stellar Mass Ejection
Scientific paper
Forty-one southern IRAS sources have been observed in the CO J = 1-0 and SiO J = 2-1, v = 1 lines with the 15-m Swedish European Submillimeter Telescope, and CO or SiO emission has been detected in 20 sources. Among 41 sources, southern carbon stars with silicate features were observed but no CO or SiO emission was detected except in IRAS 13442-6109 for which the identification with the carbon star C2123 is questionable. Nondetection of SiO masers in carbon stars with silicate features favors the transition-phase hypothesis for the origin of these stars. Some SiO emission has been detected in stars with IRAS LRS class 4n, confirming that silicate absorption can mimic SiC emission in the coldest 4n sources. The detection rate and chemistry of circumstellar envelopes are discussed.
Deguchi Shigeki
Nakada Yoshikazu
Sahai Raghvendra
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