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λ3883 CN Band Strengths for 238 Metal-Poor Halo Giants: Evidence for Chemical Differences Between Globular-Cluster and Halo Field Giants

G. E. Langer, Nicholas B. Suntzeff and Robert P. Kraft
Publications of the Astronomical Society of the Pacific
Vol. 104, No. 677 (1992 July), pp. 523-532
Stable URL: http://www.jstor.org/stable/40679899
Page Count: 10
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λ3883 CN Band Strengths for 238 Metal-Poor Halo Giants: Evidence for Chemical Differences Between Globular-Cluster and Halo Field Giants
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Abstract

Cyanogen band strengths m(CN) for 238 metal-poor giants in the halo field and in 13 globular clusters are tabulated. The distribution of w(CN) in field giants of intermediate metallicity is compared with that of giants of similar evolutionary state in M79, M3, and Ml3. The field star population is dominated by weak-CN stars. M79 has mostly giants with CN bands of intermediate strength, M3 has relatively few giants with strong CN bands, and Ml3 is dominated by strong-CN giants. These results add evidence in support of the notion that halo field stars and stars of most globular clusters differ chemically even at equivalent [Fe/H]. In the spectra of giant stars in the very metal-poor clusters Ml5 and M92, CN bands tend to disappear, and become noticeable only in stars having exceptionally large nitrogen abundances.

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