Lithium Abundances in Halo Subgiants

Details Lithium Abundances in Halo Subgiants Lithium Abundances in Halo Subgiants

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..847...21y&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Hori

Astronomy and Astrophysics

Astrophysics

1

Giant And Subgiant Stars, Abundances, Chemical Composition, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

We present lithium abundances for 28 halo subgiants based on high resolution, high signal-to-noise ratio spectra. Excluding the known lithium-rich subgiant BD +23 3912, the maximum abundances are log ɛ(Li) = 2.35. While subgiants evolve from stars hotter than the main sequence turn-off with shallower convection zones that may have depleted lithium to a lesser degree, lithium abundances in halo subgiants are not in agreement with the primordial value as predicted from standard big bang nucleosynthesis combined with recent results from WMAP.

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