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The abundance of boron in three halo starsB 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.
Document ID
19930037493
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Duncan, Douglas K.
(Space Telescope Science Inst. Baltimore, MD, United States)
Lambert, David L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lemke, Michael
(Texas Univ. Austin, United States)
Date Acquired
August 16, 2013
Publication Date
December 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 401
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A21490
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: NAG5-616
Distribution Limits
Public
Copyright
Other

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