Other
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..981l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 94, Oct. 1987, p. 981-995. Research supported by Bentley College.
Other
113
Giant Stars, Late Stars, Stellar Composition, Stellar Spectra, Supergiant Stars, Technetium, Data Reduction, M Stars, Resonance Lines, S Stars, Stellar Evolution
Scientific paper
The authors present the results of a survey of 279 late-type giants and supergiants for the spectral lines of the radioactive element technetium (Tc I) at 4297, 4262, and 4238 Å. They reach the following conclusions: (1) the presence of Tc correlates very strongly with the existence of light variability; (2) evolutionary MS stars show Tc and spectroscopic MS stars do not show Tc; (3) single S stars show Tc; (4) SC stars show Tc; (5) about 75% of the C stars show Tc; (6) Ba II stars do not show Tc. The findings are compatible with the predictions from stellar evolution theory that Tc, along with other s-process elements and carbon, is mixed with the surface materials after helium shell flashing episodes. The presence of Tc is a very sensitive indicator of the third dredge-up and can be detected in the spectrum before enhancements of other s-process elements are measurable.
Hagen Bauer Wendy
Little Stephen J.
Little-Marenin Irene R.
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