Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..977s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 94, Oct. 1987, p. 977-980.
Astronomy and Astrophysics
Astronomy
9
Iue, S Stars, White Dwarf Stars, Asymptotic Giant Branch Stars, Resonance Lines, Stellar Evolution, Stellar Luminosity
Scientific paper
A search for hot companions to five stars of type MS and S has been carried out using the International Ultraviolet Explorer (IUE) satellite. No hot companions were detected for the MS stars HR 85, 4647, 6702, and 8062, and the S star HR 8714. Limits on the luminosities of possible white dwarf companions provide lower limits of 2 - 5×108yr to the ages of any degenerate companions. All five stars exhibit strong Tc I lines, and the presence of technetium, with a half-life of 2.1×105yr, signifies recent nucleosynthesis. The limits on the ages of possible white dwarf companions that are ≥1000 half-lives of Tc exclude the possibility that the s-process elemental enhancements seen in these MS and S stars resulted from mass transfer from a more highly evolved companion (as is probably the mechanism by which barium stars are created). These MS and S stars represent a sample of true thermally pulsing asymptotic giant-branch stars.
Lambert David L.
Smith Verne V.
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