Mathematics – Logic
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..710l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Feb. 1990, p. 710-722. Research supported by Cornell University.
Mathematics
Logic
17
Black Body Radiation, Far Infrared Radiation, Interstellar Masers, Oxygen, Stellar Color, Color-Color Diagram, Mira Variables, Stellar Mass Ejection
Scientific paper
The far-IR colors of bright oxygen-rich stars define a clear sequence from sources along the blackbody curve with temperatures above 2000 K, across a small 'gap' at color temperatures in the range 1000-2000 K, down to temperatures of about 300 K, where stars are heavily obscured. Circumstellar masers follow the same sequence from the red edge of the gap through the whole temperature sweep, which, with the addition of the heavily obscured OH/IR stars, extends even further to the red. This survey of the detection statistics exhibited by masers in circumstellar shells in association with their far-IR colors allows the evolution of shells to be traced from their inception, when stellar types are generally of low M type, through the steady addition of new masing species as a shell increases its ability to shield molecules from interstellar UV photodissociation, while it grows in radius and density. This has been previously foreshadowed as part of the Chronological Paradigm (Lewis, 1989).
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