The BA II Stars.

Abstract

The spectroscopic characteristics of a newly discovered group of peculiar G- and K-type stars are described. All the stars discussed show abnormally strong lines of ionized barium, as well as CH, C1, and pr5bably also CN bands of anomalous intensity. The strength of the lines of Ba Ir is not due to high luminosity but appears rather to be associated with an atmospheric carbon abundance intermediate between that of normal stars and that of members of the presently accepted carbon-star group. The possible connection between the Ba II stars and the stars of type S is briefly discussed.