Beryllium in the Galactic halo - Surface abundances from standard, diffusive, and rotational stellar evolution, and implications

Details Beryllium in the Galactic halo - Surface abundances from standard, diffusive, and rotational stellar evolution, and implications Beryllium in the Galactic halo - Surface abundances from standard, diffusive, and rotational stellar evolution, and implications

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365l..67d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. L67-L71.

Astronomy and Astrophysics

Astrophysics

22

Abundance, Beryllium, Halos, Milky Way Galaxy, Stellar Evolution, Big Bang Cosmology, Interstellar Chemistry, Metallicity, Stellar Composition, Stellar Models

Scientific paper

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.

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