The nature of the F STR lambda 4077 stars. IV. Search for white dwarfs around barium dwarfs.

Abstract

The energy distribution of three stars classified as F str 4077-A by Bidelman has been observed in the ultraviolet with the IUE satellite. Although the stars examined have the same kind of abundance anomalies as the Ba giants and Bond's CH subgiants (i.e. an overabundance of s-process elements), no UV excess related with the presence of the expected white dwarf companion was found. The implications for the mass-transfer scenario are discussed.