Abstract: On the Cobalt Abundances of Early Type Stars.

Photographic region high-dispersion high signal-to-noise spectra of A and F main sequence band stars which exhibit modest rotation show Co I lines. In the hottest of these stars, we also found weak Co II lines whose abundances are consistent with those from Co I lines. As a class the Am stars have cobalt abundances which are greater than solar while the normal stars have solar values.