Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5002w&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #50.02; Bulletin of the American Astronomical Society, Vol. 24, p.1203
Astronomy and Astrophysics
Astronomy
Scientific paper
The first results of a CO survey of over 250 IRAS sources conducted at the Caltech Submillimeter Observatory are described. Most of the survey was conducted in the 345 GHz J=3-2 line to minimize interference from molecular clouds. The survey was designed to observe the brightest as yet unobserved sources in various regions of the 12/25/60microns colour-colour diagram to provide a complete sample of stars at all of the late stages of evolution. This survey has attempted to fill the gaps left by previous observations so that selection effects can more easily be accounted for. In each of 10 regions of the 12/25/60microns colour-colour diagram the survey is complete to a given 60microns flux, after excluding sources south of delta =-45(deg) and sources that are previously observed in CO or are known not to be evolved stars. About 150 stars were detected, and mass loss rates are derived for some of these, with an emphasis on red supergiants. The late stages of stellar evolution are dominated by mass loss. This process is poorly understood, and bears on such questions as the rate of mass return to the ISM, the effect on late stellar evolution, the white dwarf mass as a function of initial stellar mass, and the formation rate of planetary nebul\ae, white dwarfs and supernov\ae. Due to dust formation in their winds, cool evolved stars are IR bright. This makes the IRAS point source catalog a powerful tool for finding and studying such stars. Molecular lines allow us to directly observe the dense stellar winds and to estimate the mass loss rates.
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