A discontinuity in cyanogen strengths between giant stars of the disk and the halo

Details A discontinuity in cyanogen strengths between giant stars of the disk and the halo A discontinuity in cyanogen strengths between giant stars of the disk and the halo

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..470h&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 15, 1980, p. 470-477.

Astronomy and Astrophysics

Astrophysics

23

Cn Emission, Giant Stars, Globular Clusters, Stellar Spectrophotometry, Abundance, Color-Magnitude Diagram, Late Stars, Nitrogen, Stellar Atmospheres, Stellar Evolution, Ultraviolet Spectra

Scientific paper

The paper examines a discontinuity in cyanogen strengths between giant stars of the disk and the halo. It is shown that giant stars exhibiting the weakest CN strength have CN indices about 0.1 mag lower than those among the low-velocity disk field giants with the same UV excess; that the high-velocity field giants of the same ultraviolet excess show similar Cn strengths to those shown by the 47 Tuc giants; and that although the Cn strong stars in 47 Tuc define the same giant sequences in the color-magnitude diagram as the weak CN stars, they are relatively more abundant on the asymptotic branch and near the tip of the giant branch.

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