Niobium and rubidium in the barium star Zeta Capricorni

Details Niobium and rubidium in the barium star Zeta Capricorni Niobium and rubidium in the barium star Zeta Capricorni

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..226s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, March 1984, p. 226-230. Research supported by the R

Astronomy and Astrophysics

Astronomy

27

Metallicity, Niobium, Peculiar Stars, Red Giant Stars, Rubidium, Nuclear Fusion, Stellar Spectra

Scientific paper

An abundance analysis of the elements Rb to Nb (relative to the G-giant standard ɛ Vir) has been carried out for the barium star ζ Cap using low-noise, high-resolution Digicon and Reticon spectra. Tech's (1971) low abundance of Nb in ζ Cap suggests that the s-process ceased less than about a million years ago. The authors' improved analysis finds a higher Nb abundance consistent with the complete decay of 93Zr to 93Nb; i.e., more than 3×106 years have elapsed since the principal phase of s-processing. The abundance of Rb suggests a neutron density of N(n) ≡ 107cm-3 for the s-process site at the close of s-processing.

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