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| Paper: |
Light Element Abundances in the Halo |
| Volume: |
92, Formation of the Galactic Halo. . . . Inside and Out |
| Page: |
327 |
| Authors: |
Boesgaard, Ann Merchant |
| Abstract: |
New abundances of lithium, beryllium, and boron in the galactic halo are presented and discussed. In particular, observations of Li in turn--off stars in M92 with the Keck I telescope indicate that 1) the primordial value for Li is higher than the Spite plateau value and 2) there is a dispersion in the Li abundance in identical mass stars indicating that stellar processes are at work to destroy Li differentially. Rotationally induced mixing is the favorite mechanism for the differential depletion of Li. Observations of Be in metal--poor halo stars have been made with the 4--m telescopes at CTIO and CFHT and with the Keck I 10--m. Abundances of Be in 35 stars were determined to search for primordial Be and to study the galactic evolution of Be. Boron has been looked for in very metal--poor stars with the Hubble Space Telescope. The star, BD --13deg 3442, with [Fe/H] = --3.0 has detectable B. |
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