K. Cunha et al., CHEMICAL EVOLUTION OF THE ORION ASSOCIATION - IV - THE OXYGEN AND IRON ABUNDANCES OF F-STARS AND G-STARS, The Astrophysical journal, 493(1), 1998, pp. 195-205
Oxygen and iron abundances are derived for a sample of pre-main-sequen
ce F and G stars of the Orion association. Results for association mem
bers are compared with results published previously for main-sequence
B stars in the association. The abundances reveal that the F and G sta
rs exhibit the pattern of abundances shown by the main-sequence B star
s: the stars have a single iron abundance, but there is a star-to-star
variation of oxygen abundance. Oxygen-rich and oxygen-poor stars are
roughly segregated on the sky.