Physics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........8h&link_type=abstract
Ph.D. Thesis New Mexico State Univ., Las Cruces.
Physics
3
Barium, G Stars, Giant Stars, Infrared Spectra, Statistical Distributions, K Stars, Stellar Magnitude, Stellar Mass, Stellar Motions, Stellar Parallax
Scientific paper
Barium stars are G- and K-giant stars with atmospheric excesses of s-process elements, and a broadband spectral depression in the blue portion of the spectrum. The strength of the wavelength 4554 Ball line is used as a classification parameter known as the barium intensity. These stars apparently belong to a young-disk population from analyses of both the solar reflex motion and their residual velocity distribution, which implies that they have an upper mass limit of around three solar masses. There is no apparent correlation of barium intensity with either luminosity or kinematic properties. The barium stars appear to be preferentially distributed in the direction of the local spiral arm, but show no preference to associate with or avoid the direction of the galactic center. The distribution in absolute magnitude combined with starcount analyses implies that these stars are slightly less numerous than previously believed. Barium stars show infrared excesses which correlate with their barium intensities. Barium intensities can be identified from DDO photometric colors to approximately the same accuracy as obtained from the more tedious method of spectral analysis. This could prove to be a useful survey tool for the future identification of these stars.
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