CN variations among main-sequence 47 Tucanae stars

Details CN variations among main-sequence 47 Tucanae stars CN variations among main-sequence 47 Tucanae stars

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l.149h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, June 15, 1980, p. L149-L153. NSF-supported research.

Other

66

Cn Emission, Globular Clusters, Main Sequence Stars, Stellar Spectrophotometry, Abundance, Spectral Line Width, Spectrum Analysis, Stellar Spectra, Subdwarf Stars

Scientific paper

Low-resolution CTIO SIT vidicon spectra of seven upper-main-sequence stars in 47 Tucanae (NGC 104) reveal differences in CN 3883 A (0, 0) band strengths. Spectrum synthesis calculations suggest that the star-to-star nitrogen abundances differ by factors of about 5, i.e., by amounts comparable to those required to explain observations of highly evolved stars in the same cluster. If a primordial origin of the variations is to be rejected, the observations require identification of a mixing mechanism or other process capable of affecting the main-sequence atmospheric abundances of CNO group elements independently of heavier ones.

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