Computer Science
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995csc..reptr....a&link_type=abstract
Technical Report, Computer Sciences Corp. Lanham, MD United States
Computer Science
Abundance, Binary Data, Stellar Evolution, Red Giant Stars, Hypotheses, Asymptotic Giant Branch Stars, Carbon, Mass Transfer, Technetium, Ultraviolet Radiation, Spectrographs
Scientific paper
To test the popular hypothesis that technetium-deficient stars of spectral types S and MS are mass-transfer binaries, we have searched for ultraviolet light from the putative hot secondaries in spectra taken with the SWP spectrograph of IUE. Although most S and MS stars are apparently thermally pulsing asymptotic giant brand (AGB) stars whose surfaces have been enriched with s-process elements and carbon dredged up from the interior, those stars whose spectra show enhanced s-process elements but no Tc are widely believed to be cooler analogs of the Ba 2 stars, which apparently owe their unusual abundances to prior mass transfer, the Tc from which has decayed away. We report IUE observations of 15 S and MS stars with the SWP, including the identification of six hot companions. Assembling the IUE observations made to date, we find clear support for the mass-transfer hypothesis, confirming evidence from other lines of research. We further discuss the ages of the companions and the implications of these discoveries for stellar evolution.
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