Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..17b&link_type=abstract
"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782
Astronomy and Astrophysics
Astrophysics
Observations
Scientific paper
A sample of 19 AGB stars has been observed in order to investigate the physical and chemical structure of their CSEs. Supplemented by a detailed excitation analysis the multi-transitional (sub-) millimeter observations show a strong correlation between the fractional abundance of SiS and the chemical type of the AGB star. Carbon stars (C/O > 1) have on average a much higher fractional abundance of SiS (3.1x10-6) than M-type stars (C/O < 1) (2.7x10-7). In contrast to the related molecule SiO, no strong correlation between the massloss rate and the SiS abundance was found. However, possible time variability of the SiS line emission in low rotational transitions and the sensitivity to chemical gradients in the inner part of the wind may mask such a correlation.
Bast J.
Olofsson Hans
Schoier Fredrik Larsen
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