Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..246d&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 246-262.
Astronomy and Astrophysics
Astrophysics
30
Cyanogen, Late Stars, Molecular Spectra, Stellar Spectra, Abundance, Astronomical Photometry, Atmospheric Models, Mass Transfer, Metals, Spectral Bands, Stellar Atmospheres
Scientific paper
The paper presents a model atmosphere and spectrum synthesis calibration for the cyanogen band strength index of DDO photometry. Synthetic 41-42 indices were computed in the DDO system for a variety of CNO compositions, and the relation between CN index and the amount of mixing from a hydrogen-burning shell is discussed. A theoretical calibration of the CN index in terms of (metals/H) has been derived. The analysis suggests that the majority of strong-CN Population I stars are more likely to be super-metal-rich than nitrogen-rich. High-dispersion studies of these stars are considered. Large samples of stars show that a definite mean relation exists between CN strength and metal abundance, although individual stars may deviate. The large enhancements of the CN bands observed in globular clusters do not result from Population I stars and can not be produced by mixing CN-cycle material from a hydrogen-burning shell.
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