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We obtain high-resolution and high signal-to-noise ratio spectra of 39 red clump giants selected from the Hipparcos Catalogue. We determine their atmospheric parameters, iron abundances, a-element enhancements, and masses. We find that the sample can be divided into a metal-poor group and a metal-rich group. The majority of the stars are metal-rich ( ) with mass around 2 , while the metal-poor group has lower surface gravity and lower mass. The variation of a-element abundances with [Fe/H]doi:10.1086/319832 fatcat:xcmbb7xs7zemret6cqhmpboace