Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..57...11n&link_type=abstract
The Messenger, vol. 57, p. 11-14
Other
1
Late-Type Stars: Carbon Monoxide, Late-Type Stars: Spectra, Late-Type Stars: Circumstellar Matter
Scientific paper
Studies of evolved stars using submm and mm-wave telescopes such as the SEST are mainly concerned with the very last stages of the life of astar, when it throws away its outer envelope and is surrounded by a shell of dust and gas. The dust obscures the star optically and most studies of stars at this stage of their evolution have been made in the radio and infrared regions of the spectrum. The circumstellar gas consists mainly of molecular hydrogen, H2, but also of other less abundant molecules (e.g. CO, SiO, OH, H20, HCN, etc.), which are important since they radiate in the radio region, something that is not these case for molecular hydrogen. These molecules can be used to study the properties of the circumstellar envelope (CSE), e. g. to determine massloss rates, which are important for the evolution of the star, and to study the chemistry of the envelope.
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