High Quality Content by WIKIPEDIA articles! Barium stars are G to K class giants, whose spectra indicate an overabundance of s-process elements by the presence of singly ionized barium, Ba II, at 455.4nm. Barium stars also show enhanced spectral features of carbon, the bands of the molecules CH, CN and C2. The class was originally recognized and defined by William Bidelman and Philip Keenan. Observational studies of their radial velocity suggested that all barium stars are binary stars Observations in the ultraviolet using International Ultraviolet Explorer detected white dwarfs in some barium star systems.

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