The abundance of boron in three halo stars

Details The abundance of boron in three halo stars The abundance of boron in three halo stars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..584d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 584-595.

Astronomy and Astrophysics

Astrophysics

138

Boron, Dwarf Stars, Galactic Halos, Stellar Spectra, Abundance, Cosmic Rays, Milky Way Galaxy, Spectrographs, Stellar Atmospheres, Ultraviolet Spectra

Scientific paper

B abundances for three halo stars: HD 140283, HD 19445, and HD 201891 are presented. Using recent determinations of the Be abundance in HD 140283, B/Be of 10 +5/-4 is found for this star, and similar ratios are inferred for HD 19445 and HD 201891. This ratio is equal to the minimum value of 10 expected from a synthesis of B and Be by high-energy cosmic-ray spallation reactions in the interstellar medium. It is shown that the accompanying synthesis of Li by alpha on alpha fusion reactions is probably a minor contributor to the observed 'primordial' Li of halo stars. The observed constant ratios of B/O and Be/O are expected if the principal channel of synthesis involves cosmic-ray CNO nuclei from the supernovae colliding with interstellar protons.

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