Taxonomy of barium stars

Abstract

Image-tube spectra and photometric observations for 389 barium stars are used to determine spectral classification, barium intensity, radial velocity, luminosity, and kinematical properties. The objective of this study is to obtain a homogeneous datased for analyzing barium characteristics in uniform fashion. The analyses show that barium stars appear to have young to old disk kinematics based upon whether are Ba weak or Ba strong. The BaII line (4554 A) is also identifiable in dwarf stars ; these dwarf barium stars are small in number and weak in intensity. The analyses of the kinematics, luminosities, U, V, W velocity distributions and statistical parallaxes show that the weak barium stars generally tend to have small velocity dispersion, brighter apparent magnitude at about same distance compared to strong Ba stars, thus lower luminosity