The abundance of boron in three halo stars

Abstract

view Abstract Citations (155) References (51) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Abundance of Boron in Three Halo Stars Duncan, Douglas K. ; Lambert, David L. ; Lemke, Michael Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1992 DOI: 10.1086/172088 Bibcode: 1992ApJ...401..584D Keywords: Boron; Dwarf Stars; Galactic Halos; Stellar Spectra; Abundance; Cosmic Rays; Milky Way Galaxy; Spectrographs; Stellar Atmospheres; Ultraviolet Spectra; Astrophysics; GALAXY: HALO; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; ABUNDANCES; STARS: ABUNDANCES; ULTRAVIOLET: STARS full text sources ADS | data products SIMBAD (3) MAST (1) ESA (1)