Other
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..180d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 180-189.
Other
60
Barium, Binary Stars, Companion Stars, Giant Stars, Peculiar Stars, Stellar Evolution, White Dwarf Stars, Abundance, Asymptotic Giant Branch Stars, Carbon Stars, Hertzsprung-Russell Diagram, Nuclear Fusion, Planetary Nebulae, Stellar Magnitude, Stellar Mass Accretion, Stellar Spectra, Ultraviolet Spectra
Scientific paper
International Ultraviolet Explorer short-wavelength, low-dispersion spectra were analyzed for four barium, two mild barium, and one R-type carbon star in order to test the hypothesis that the barium and related giants are produced by mass transfer from a companion now present as a white dwarf. An earlier tentative identification of a white dwarf companion to the mild barium star Zeta Cyg is confirmed. For the other stars, no ultraviolet excess attributable to a white dwarf is seen. Limits are set on the bolometric magnitude and age of a possible white dwarf companion. Since the barium stars do not have obvious progenitors among main-sequence and subgiant stars, mass transfer must be presumed to occur when the mass-gaining star is already on the giant branch. This restriction, and the white dwarf's minimum age, which is greater than 8 x 10 to the 8th yr, determined for several stars, effectively eliminates the hypothesis that mass transfer from an asymptotic giant branch star creates a barium star. Speculations are presented on alternative methods of producing a barium star in a binary system.
Dominy James F.
Lambert David L.
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