Four-color photometry of marginal barium stars

Details Four-color photometry of marginal barium stars Four-color photometry of marginal barium stars

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..683p&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Dec. 1978-Jan. 1979, p. 683-685.

Astronomy and Astrophysics

Astronomy

11

Barium, Giant Stars, Metallic Stars, Stellar Spectrophotometry, Ubv Spectra, Absorption Spectra, Late Stars, Line Spectra, Spectrum Analysis

Scientific paper

Photometric observations in the Stromgren uvby system are reported for 15 marginal barium stars, four classical barium stars, nine strontium stars, and about 20 normal giants (for comparison). Plots of c1 index vs. (b-y) and of Ba/Fe abundance ratio vs. delta c1 are presented for the observed stars. It is found that the marginal barium stars exhibit a decrease of 0 to 0.1 mag in c1, which is possibly correlated with the degree of s-process element enrichment, and that some stars may show a small degree of s-process enrichment without a corresponding decrease in c1 index. The results indicate that while four-color photometry is useful in discriminating classical barium stars from normal giants, the marginal barium stars are not necessarily separated from normal stars in the c1 vs. (b-y) diagram.

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