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Record Details

Record 35 of 6607
Beryllium in the Galactic halo - Surface abundances from standard, diffusive, and rotational stellar evolution, and implications
External Online Source: doi:10.1086/185890
Author and Affiliation:
Deliyannis, Constantine P.(Yale Univ., New Haven, CT, United States)
Pinsonneault, Marc H.(Yale University, New Haven, CT, United States)
Abstract: The recently observed upper limits to the beryllium abundances in population II stars are much lower than population I detections. This difference reflects an intrinsic difference in the initial abundances and is not caused by different degrees of depletion driven by stellar evolution processes from similar initial abundances. Evolutionary sequences of models from the early premain sequence to beyond the turnoff that correspond to halo dwarfs with Fe/H abundances of -1.3, -2.3, and -3.3 are constructed, and standard, diffusive, and rotational mechanisms are used to estimate a maximal possible beryllium depletion. Halo star models in the T(eff) range 6000 to 5000 K might be rotationally depleted by a factor of 1.5-2, and the total depletion should be no more than (conservatively) a factor of 3. Implications for cosmology, cosmic-ray theory, and Galactic chemical evolution are discussed.
Publication Date: Dec 20, 1990
Document ID:
19910033896
(Acquired Nov 28, 1995)
Accession Number: 91A18519
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 365; L67-L71
Publisher Information: United States
Contract/Grant/Task Num: NAGW-778
Financial Sponsor: NASA; United States
Organization Source: Yale Univ.; New Haven, CT, United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABUNDANCE; BERYLLIUM; GALACTIC HALOS; MILKY WAY GALAXY; STELLAR EVOLUTION; BIG BANG COSMOLOGY; INTERSTELLAR CHEMISTRY; METALLICITY; STELLAR COMPOSITION; STELLAR MODELS
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. L67-L71.
Availability Source: Other Sources
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