Computer Science
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9672093j&link_type=abstract
Conference Paper, Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Computer Science
S Stars, Abundance, Mass Transfer, Binary Stars, White Dwarf Stars, F Stars, Stellar Spectra, Ultraviolet Radiation, Iue, Asymptotic Giant Branch Stars
Scientific paper
Through a search for the putative white-dwarf companions with IUE, we have for several years been testing the popular hypothesis that Tc-deficient S and MS stars are not thermally pulsing AGB stars but are mass transfer binaries. Several companions have been discovered, and most evidence supports the idea. Recently, we discovered an FO-F2 IV-V companion to the Tc-poor S star HD 191589, a counter example of this hypothesis unless it is a triple system. In that case, the less evolved F-dwarf companion may also be contaminated by s-process material. We have recently obtained a 20-hour LWP high-dispersion spectrum of this system and have begun generating synthetic spectra of a dF star with enhanced s-process abundances for comparison. We will discuss the technique and present preliminary results of abundance anomalies.
Ake Thomas B.
Johnson Hollis R.
Jorissen Alain
Wahlgren Glenn Michael
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