Elemental abundances of the field horizontal-branch stars – III

Studies of 55-Å wide regions recently obtained with a CCD at the coudé feed telescope of the Kitt Peak National Observatory (KPNO) are used to extend the fine analyses of the field horizontal-branch (FHB) A stars HD 74721, HD 86986 and HD 130095, and to begin those of HD 93329, HD 128801 and HD 167105. ATLAS9 model atmospheres were used. Spectra of other stars, obtained at both KPNO and the Dominion Astrophysical Observatory (DAO), confirm previously found wavelength-dependent equivalent width systematics. The FHB A-type stars have somewhat different chemical compositions than other Population II stars. Most importantly, the [Ca/Fe] values for about one-half of our sample are smaller than the trend of values for the metal-deficient field red giants found by Luck & Bond. HD 128801 has a somewhat different pattern of abundance anomalies than the other FHB A stars studied. Some of the abundances of the FHB A stars are found to be correlated: Al with Fe, Ca with Ti, Ti with Cr, and Ti with Fe.