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V/81 Taxonomy of Barium Stars (Lu 1991)
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Beginning of ReadMe :V/81 Taxonomy of Barium Stars (Lu 1991)
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Taxonomy of Barium Stars
Lu P.K.
<Astron. J. 101, 2229, (1991)>
=1991AJ....101.2229L
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ADC_Keywords: Spectroscopy ; Stars, late-type ; Stars, barium
Abstract:
Image-tube spectra and photometric observations for 389 bariums stars have
been used to determine spectral classification, barium intensity, radial
velocity, luminosity, and kinematical properties. The objective of this
study is to obtain a homogeneous dataset for analyzing barium
characteristics in uniform fashion.
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Summary:
The objective of this study is to obtain a homogeneous dataset for analyzing
barium characteristics in uniform fashion. The analyses show that barium
stars appear to have young to old disk kinematics based upon whether they
are Ba weak or Ba strong. The Ba II line (4554A) 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 using image-tube radial velocities and statistical parallaxes
using proper motions and upsilon components show that the weak barium stars
generally tend to have smaller velocity dispersion, and brighter apparent
magnitudes at about same distance compared to strong Ba stars, and thus
lower luminosity. The solution for the mean spectroscopic distances, the
z-scale height distances and reduced proper motions also confirm the this
finding.
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