Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..511w&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 677, July 1992, p. 511-513. Research supported
Astronomy and Astrophysics
Astrophysics
8
Abundance, Emission Spectra, Mira Variables, Rubidium, S Stars, Metallicity, Molecular Collisions, Nuclear Astrophysics, Stellar Spectra
Scientific paper
On 1991 August 20 the resonance lines of both K I and Rb I were found to be in emission in R Andromedae, a classical S-type Mira star. Assuming that both lines are excited by collisions with the same species the ratio of K/Rb is found to be 30 which is a factor 10 lower than in the sun. Using earlier analyses of the Zr abundance Rb/Zr = 0.2 which may be compared with a value of Rb/Zr = -0.66 found for the barium star HR 774. Using their analysis as modified by n-capture cross sections of the sensitivity of the Rb/Zr ratio to neutron density through the branching isotope Kr-85 the neutron density in R And is estimated to be about 10 exp 8/cu cm at the time of s-processing.
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