The IRAS two-colour diagram as a tool for studying late stages of stellar evolution

Details The IRAS two-colour diagram as a tool for studying late stages of stellar evolution The IRAS two-colour diagram as a tool for studying late stages of stellar evolution

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..125v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 125-134. ZWO-supported research.

Astronomy and Astrophysics

Astronomy

409

Color-Color Diagram, Infrared Astronomy Satellite, Infrared Photometry, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Giant Stars, Infrared Stars, Mira Variables

Scientific paper

Dust/gas envelope stars (DGE-stars), thought to be situated at the top of the Asymptotic Giant Branch, are studied using IRAS two-color diagrams. Consideration is given to the hypothesis that IRAS two-color diagrams, together with data from the LRS catalog and information on the IR variability, make it possible to distinguish stars with oxygen-rich circumstellar shells from carbon-rich ones and to order stars according to their mass loss rate. It has been suggested that carbon-rich material is dredged up during a thermal pulse and this can cause the trransformation of an oxygen-rich circumstellar shell into a carbon-rich one.

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