Technetium and niobium abundances in four stars of types MS and S

Details Technetium and niobium abundances in four stars of types MS and S Technetium and niobium abundances in four stars of types MS and S

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..937w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 937-941.

Astronomy and Astrophysics

Astrophysics

22

Metallicity, Niobium, S Stars, Stellar Composition, Technetium, Nuclear Fusion, Stellar Cores, Stellar Mass, Stellar Spectra

Scientific paper

Abundances of Zr, Nb, and Tc relative to V, have been derived from 2.2 and 6.0 Å mm-1 spectra of four evolved stars. The authors derive a range in the Nb/Tc ratio from 0.2 dex to more than 1.7 dex. This shows that a variety of time scales are present since the most recent shell flash as well as a range of total shell flashes. These stars may well have a spread in mass and surely show a range in their stages of AGB evolution. The time scale between flashes seems to be rather long implying degenerate cores near 0.5 to 0.6 M_sun;.

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