Water masers from carbon stars with silicate features

Details Water masers from carbon stars with silicate features Water masers from carbon stars with silicate features

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193l..13n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. L13-L15. Research supported by the Nobeyama Radio

Astronomy and Astrophysics

Astrophysics

30

Carbon Stars, Silicates, Stellar Spectra, Water Masers, Emission Spectra, Southern Sky, Stellar Envelopes

Scientific paper

The authors have searched for water maser emission at 22.235 GHz in five southern carbon stars which exhibit 10 and 20 micron silicate features in their IRAS low resolution spectra. Two stars, MC79-11 and C2123, have been found to show water maser emission. These detections, together with the detection of water masers in two northern stars firmly establish the presence of oxygen-rich circumstellar envelopes around some carbon stars. The high detection rate of 22 GHz water emission in the carbon stars with silicate features (four out of nine) supports the hypothesis that these objects are in a transition phase of evolution between oxygen-rich and carbon-rich circumstellar envelopes.

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