S-bearing molecules in O-rich circumstellar envelopes

Details S-bearing molecules in O-rich circumstellar envelopes S-bearing molecules in O-rich circumstellar envelopes

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..490o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 2, p. 490-514.

Astronomy and Astrophysics

Astrophysics

50

Abundance, Interstellar Chemistry, Stellar Composition, Stellar Envelopes, Stellar Spectra, Emission Spectra, Hydrogen Sulfide, Molecular Excitation, Sulfur Dioxides

Scientific paper

Results are presented of a systematic survey of the millimeter line emission of SO2 and H2S in various categories of O-rich circumstellar envelopes, carried out with the IRAM 30-m telescope on Pico Veleta, Spain. The sample consists of 14 OH/IR stars of three classes: IRC objects with intermediate mass-loss rates, very cold OH/IR stars, and OH supergiants. The data presented (which include the parameters of detected lines and observed spectra) demonstrate that the properties of the line emission of the H2S, SO2, and SO molecules are relatively homogeneous within each of the three classes of stars. However, SO2 is hardly detectable in Mira and in semiregular variables, and H2S is very weak in C-rich circumstellar envelopes; it was detected only in IRC + 10216.

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