ELEMENTAL ABUNDANCES AND ATMOSPHERIC PARAMETERS OF 7 F-G SUPERGIANTS

Spectroscopic abundance determinations for a sample of seven F-G stars have been carried out. The majority of them have large galactic latit udes. One objective in deriving spectroscopic abundances is to differe ntiate evolved objects seen at high galactic latitudes from the young Population I supergiant stars that happen to have large galactic latit udes but actually belong to the galactic disk. Second, it is important to get good calibrators for photometric metallicity indices. It has b een suggested in the past that many high galactic-latitude F-G stars t hat are classified as supergiants are in reality subgiants or dwarfs. Our spectroscopically derived gravities show that two of the stars stu died in this paper, HR 5165 and HD 114520, are not supergiants as clas sified in the Bright Star Catalogue but are subgiants belonging to the solar neighborhood. In our sample, HR 3229 and HR 8470 display solar abundances and the derived gravities support the bright giant luminosi ty class ascribed to them. HR 4114, HR 4912, and HR 7671 have abundanc es significantly different from those of young supergiants of galactic disk. The evolutionary status of these objects is discussed.