Abstract
Synthetic Lick indices computed with solar scaled abundances and with α-element enhancement are presented and compared with predictions from both theoretical computations (Tripicco & Bell; Thomas, Maraston, & Bender; Barbuy et al.) and empirical fitting functions (de Freitas Pacheco). We propose selected combinations of indices capable of singling out α-enhanced stars without requiring previous knowledge of their main atmospheric parameters. By applying this approach to the 460 stars in the Worthey et al. catalog, we detected a list of 82 candidate α-enhanced stars. The confirmation of α-enhancement was obtained by searching the literature for individual element abundance determinations from high-resolution spectroscopy for a subsample of 34 stars. Preliminary discussion of the properties of the detected α-enhanced stars with respect to their [Fe/H] values and kinematics is presented.
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