ELEMENTAL ABUNDANCE ANALYSES WITH DAO SPECTROGRAMS .16. THE NORMAL-F MAIN-SEQUENCE STARS SIGMA-BOOTIS, THETA-CYGNI AND IOTA-PISCUM, AND THEAM STARS 15-VULPECULAE AND 32-AQUARII

Elemental abundances of the sharp-lined F2 V star sigma Boo are derive d consistent with other studies of this series of papers. Previous stu dies of the F4 V star theta Cyg and the F7 V star iota Psc and of the Am stars 15 Vul and 32 Aqr are revised and extended. The normal stars have microturbulences between 1.2 and 1.6 km s(-1), while the Am stars have values between 4.0 and 4.5 km s(-1). Most derived abundances for a Cyg are close to solar as are those for iota Psc, except for the ra re earth elements which are enhanced. sigma Boo, however, is a margina lly metal-poor star. The abundances of 15 Vul indicate it is a margina l Am star while those of 32 Aqr exhibit the Am phenomenon to a greater extent.