Abstract
We have determined lithium abundances for a sample of 79 halo subgiants. The subgiant candidates were identified using uvby photometry from several catalogs of metal-poor stars. The basic data were high-resolution, low-noise coude spectra in the 6700 A spectral region. Abundances of iron and calcium, derived from one Ca I and several Fe I lines in our spectra, provided a metallicity discriminant for the stars in our sample. The subgiants with temperatures between 5500 and 4900 K show a steady decline of lithium abundance with advancing subgiant position (and decreasing temperature). The observed trend is in qualitative agreement with recent theoretical models of lithium dilution in metal-poor stars, especially if main-sequence diffusion is included
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